mirror of
https://github.com/mediacms-io/mediacms.git
synced 2024-11-22 08:13:33 +01:00
742 lines
20 KiB
Python
742 lines
20 KiB
Python
# Kudos to Werner Robitza, AVEQ GmbH, for helping with ffmpeg
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# related content
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import hashlib
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import json
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import math
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import os
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import random
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import shutil
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import subprocess
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import tempfile
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from fractions import Fraction
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import filetype
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from django.conf import settings
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CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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CRF_ENCODING_NUM_SECONDS = 2 # 0 * 60 # videos with greater duration will get
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# CRF encoding and not two-pass
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# Encoding individual chunks may yield quality variations if you use a
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# too low bitrate, so if you go for the chunk-based variant
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# you should use CRF encoding.
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MAX_RATE_MULTIPLIER = 1.5
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BUF_SIZE_MULTIPLIER = 1.5
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# in seconds, anything between 2 and 6 makes sense
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KEYFRAME_DISTANCE = 4
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KEYFRAME_DISTANCE_MIN = 2
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# speed presets
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# see https://trac.ffmpeg.org/wiki/Encode/H.264
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X26x_PRESET = "medium" # "medium"
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X265_PRESET = "medium"
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X26x_PRESET_BIG_HEIGHT = "faster"
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# VP9_SPEED = 1 # between 0 and 4, lower is slower
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VP9_SPEED = 2
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VIDEO_CRFS = {
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"h264_baseline": 23,
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"h264": 23,
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"h265": 28,
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"vp9": 32,
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}
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# video rates for 25 or 60 fps input, for different codecs, in kbps
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VIDEO_BITRATES = {
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"h264": {
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25: {
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240: 300,
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360: 500,
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480: 1000,
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720: 2500,
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1080: 4500,
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1440: 9000,
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2160: 18000,
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},
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60: {720: 3500, 1080: 7500, 1440: 18000, 2160: 40000},
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},
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"h265": {
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25: {
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240: 150,
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360: 275,
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480: 500,
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720: 1024,
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1080: 1800,
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1440: 4500,
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2160: 10000,
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},
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60: {720: 1800, 1080: 3000, 1440: 8000, 2160: 18000},
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},
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"vp9": {
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25: {
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240: 150,
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360: 275,
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480: 500,
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720: 1024,
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1080: 1800,
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1440: 4500,
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2160: 10000,
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},
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60: {720: 1800, 1080: 3000, 1440: 8000, 2160: 18000},
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},
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}
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AUDIO_ENCODERS = {"h264": "aac", "h265": "aac", "vp9": "libopus"}
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AUDIO_BITRATES = {"h264": 128, "h265": 128, "vp9": 96}
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EXTENSIONS = {"h264": "mp4", "h265": "mp4", "vp9": "webm"}
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VIDEO_PROFILES = {"h264": "main", "h265": "main"}
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def get_portal_workflow():
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return settings.PORTAL_WORKFLOW
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def get_default_state(user=None):
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# possible states given the portal workflow setting
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state = "private"
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if settings.PORTAL_WORKFLOW == "public":
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state = "public"
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if settings.PORTAL_WORKFLOW == "unlisted":
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state = "unlisted"
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if settings.PORTAL_WORKFLOW == "private_verified":
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if user and user.advancedUser:
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state = "unlisted"
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return state
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def get_file_name(filename):
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return filename.split("/")[-1]
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def get_file_type(filename):
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if not os.path.exists(filename):
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return None
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file_type = None
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kind = filetype.guess(filename)
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if kind is not None:
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if kind.mime.startswith("video"):
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file_type = "video"
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elif kind.mime.startswith("image"):
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file_type = "image"
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elif kind.mime.startswith("audio"):
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file_type = "audio"
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elif "pdf" in kind.mime:
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file_type = "pdf"
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else:
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# TODO: do something for files not supported by filetype lib
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pass
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return file_type
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def rm_file(filename):
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if os.path.isfile(filename):
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try:
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os.remove(filename)
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return True
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except OSError:
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pass
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return False
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def rm_files(filenames):
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if isinstance(filenames, list):
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for filename in filenames:
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rm_file(filename)
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return True
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def rm_dir(directory):
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if os.path.isdir(directory):
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# refuse to delete a dir inside project BASE_DIR
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if directory.startswith(settings.BASE_DIR):
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try:
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shutil.rmtree(directory)
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return True
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except (FileNotFoundError, PermissionError):
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pass
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return False
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def url_from_path(filename):
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# TODO: find a way to preserver http - https ...
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return "{0}{1}".format(settings.MEDIA_URL, filename.replace(settings.MEDIA_ROOT, ""))
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def create_temp_file(suffix=None, dir=settings.TEMP_DIRECTORY):
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tf = tempfile.NamedTemporaryFile(delete=False, suffix=suffix, dir=dir)
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return tf.name
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def create_temp_dir(suffix=None, dir=settings.TEMP_DIRECTORY):
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td = tempfile.mkdtemp(dir=dir)
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return td
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def produce_friendly_token(token_len=settings.FRIENDLY_TOKEN_LEN):
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token = ""
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while len(token) != token_len:
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token += CHARS[random.randint(0, len(CHARS) - 1)]
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return token
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def clean_friendly_token(token):
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# cleans token
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for char in token:
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if char not in CHARS:
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token.replace(char, "")
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return token
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def mask_ip(ip_address):
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return hashlib.md5(ip_address.encode("utf-8")).hexdigest()
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def run_command(cmd, cwd=None):
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"""
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Run a command directly
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"""
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if isinstance(cmd, str):
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cmd = cmd.split()
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ret = {}
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if cwd:
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process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=cwd)
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else:
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process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdout, stderr = process.communicate()
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# TODO: catch unicodedecodeerrors here...
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if process.returncode == 0:
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try:
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ret["out"] = stdout.decode("utf-8")
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except BaseException:
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ret["out"] = ""
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try:
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ret["error"] = stderr.decode("utf-8")
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except BaseException:
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ret["error"] = ""
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else:
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try:
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ret["error"] = stderr.decode("utf-8")
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except BaseException:
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ret["error"] = ""
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return ret
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def media_file_info(input_file):
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"""
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Get the info about an input file, as determined by ffprobe
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Returns a dict, with the keys:
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- `filename`: Filename
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- `file_size`: Size of the file in bytes
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- `video_duration`: Duration of the video in `s.msec`
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- `video_frame_rate`: Framerate in Hz
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- `video_bitrate`: Bitrate of the video stream in kBit/s
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- `video_width`: Width in pixels
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- `video_height`: Height in pixels
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- `video_codec`: Video codec
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- `audio_duration`: Duration of the audio in `s.msec`
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- `audio_sample_rate`: Audio sample rate in Hz
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- `audio_codec`: Audio codec name (`aac`)
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- `audio_bitrate`: Bitrate of the video stream in kBit/s
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Also returns the video and audio info raw from ffprobe.
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"""
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ret = {}
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if not os.path.isfile(input_file):
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ret["fail"] = True
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return ret
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video_info = {}
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audio_info = {}
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cmd = ["stat", "-c", "%s", input_file]
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stdout = run_command(cmd).get("out")
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if stdout:
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file_size = int(stdout.strip())
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else:
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ret["fail"] = True
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return ret
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cmd = ["md5sum", input_file]
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stdout = run_command(cmd).get("out")
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if stdout:
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md5sum = stdout.split()[0]
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else:
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md5sum = ""
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cmd = [
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settings.FFPROBE_COMMAND,
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"-loglevel",
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"error",
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"-show_streams",
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"-show_entries",
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"format=format_name",
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"-of",
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"json",
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input_file,
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]
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stdout = run_command(cmd).get("out")
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try:
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info = json.loads(stdout)
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except TypeError:
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ret["fail"] = True
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return ret
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has_video = False
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has_audio = False
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for stream_info in info["streams"]:
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if stream_info["codec_type"] == "video":
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video_info = stream_info
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has_video = True
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if info.get("format") and info["format"].get("format_name", "") in [
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"tty",
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"image2",
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"image2pipe",
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"bin",
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"png_pipe",
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"gif",
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]:
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ret["fail"] = True
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return ret
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elif stream_info["codec_type"] == "audio":
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audio_info = stream_info
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has_audio = True
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if not has_video:
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ret["is_video"] = False
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ret["is_audio"] = has_audio
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ret["audio_info"] = audio_info
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return ret
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if "duration" in video_info.keys():
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video_duration = float(video_info["duration"])
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elif "tags" in video_info.keys() and "DURATION" in video_info["tags"]:
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duration_str = video_info["tags"]["DURATION"]
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try:
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hms, msec = duration_str.split(".")
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except ValueError:
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hms, msec = duration_str.split(",")
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total_dur = sum(int(x) * 60 ** i for i, x in enumerate(reversed(hms.split(":"))))
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video_duration = total_dur + float("0." + msec)
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else:
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# fallback to format, eg for webm
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cmd = [
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settings.FFPROBE_COMMAND,
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"-loglevel",
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"error",
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"-show_format",
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"-of",
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"json",
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input_file,
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]
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stdout = run_command(cmd).get("out")
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format_info = json.loads(stdout)["format"]
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try:
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video_duration = float(format_info["duration"])
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except KeyError:
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ret["fail"] = True
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return ret
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if "bit_rate" in video_info.keys():
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video_bitrate = round(float(video_info["bit_rate"]) / 1024.0, 2)
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else:
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cmd = [
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settings.FFPROBE_COMMAND,
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"-loglevel",
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"error",
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"-select_streams",
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"v",
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"-show_entries",
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"packet=size",
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"-of",
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"compact=p=0:nk=1",
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input_file,
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]
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stdout = run_command(cmd).get("out")
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stream_size = sum([int(line) for line in stdout.split("\n") if line != ""])
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video_bitrate = round((stream_size * 8 / 1024.0) / video_duration, 2)
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ret = {
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"filename": input_file,
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"file_size": file_size,
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"video_duration": video_duration,
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"video_frame_rate": float(Fraction(video_info["r_frame_rate"])),
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"video_bitrate": video_bitrate,
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"video_width": video_info["width"],
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"video_height": video_info["height"],
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"video_codec": video_info["codec_name"],
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"has_video": has_video,
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"has_audio": has_audio,
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}
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if has_audio:
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if "duration" in audio_info.keys():
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audio_duration = float(audio_info["duration"])
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elif "tags" in audio_info.keys() and "DURATION" in audio_info["tags"]:
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duration_str = audio_info["tags"]["DURATION"]
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try:
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hms, msec = duration_str.split(".")
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except ValueError:
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hms, msec = duration_str.split(",")
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total_dur = sum(int(x) * 60 ** i for i, x in enumerate(reversed(hms.split(":"))))
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audio_duration = total_dur + float("0." + msec)
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else:
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# fallback to format, eg for webm
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cmd = [
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settings.FFPROBE_COMMAND,
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"-loglevel",
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"error",
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"-show_format",
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"-of",
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"json",
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input_file,
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]
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stdout = run_command(cmd).get("out")
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format_info = json.loads(stdout)["format"]
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audio_duration = float(format_info["duration"])
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if "bit_rate" in audio_info.keys():
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audio_bitrate = round(float(audio_info["bit_rate"]) / 1024.0, 2)
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else:
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# fall back to calculating from accumulated frame duration
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cmd = [
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settings.FFPROBE_COMMAND,
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"-loglevel",
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"error",
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"-select_streams",
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"a",
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"-show_entries",
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"packet=size",
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"-of",
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"compact=p=0:nk=1",
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input_file,
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]
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stdout = run_command(cmd).get("out")
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stream_size = sum([int(line) for line in stdout.split("\n") if line != ""])
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audio_bitrate = round((stream_size * 8 / 1024.0) / audio_duration, 2)
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ret.update(
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{
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"audio_duration": audio_duration,
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"audio_sample_rate": audio_info["sample_rate"],
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"audio_codec": audio_info["codec_name"],
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"audio_bitrate": audio_bitrate,
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"audio_channels": audio_info["channels"],
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}
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)
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ret["video_info"] = video_info
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ret["audio_info"] = audio_info
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ret["is_video"] = True
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ret["md5sum"] = md5sum
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return ret
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def calculate_seconds(duration):
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# returns seconds, given a ffmpeg extracted string
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ret = 0
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if isinstance(duration, str):
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duration = duration.split(":")
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if len(duration) != 3:
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return ret
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else:
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return ret
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ret += int(float(duration[2]))
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ret += int(float(duration[1])) * 60
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ret += int(float(duration[0])) * 60 * 60
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return ret
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def show_file_size(size):
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if size:
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size = size / 1000000
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size = round(size, 1)
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size = "{0}MB".format(str(size))
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return size
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def get_base_ffmpeg_command(
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input_file,
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output_file,
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has_audio,
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codec,
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encoder,
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audio_encoder,
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target_fps,
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target_height,
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target_rate,
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target_rate_audio,
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pass_file,
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pass_number,
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enc_type,
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chunk,
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):
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"""Get the base command for a specific codec, height/rate, and pass
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Arguments:
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input_file {str} -- input file name
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output_file {str} -- output file name
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has_audio {bool} -- does the input have audio?
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codec {str} -- video codec
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encoder {str} -- video encoder
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audio_encoder {str} -- audio encoder
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target_fps {int} -- target FPS
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target_height {int} -- height
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target_rate {int} -- target bitrate in kbps
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target_rate_audio {int} -- audio target bitrate
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pass_file {str} -- path to temp pass file
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pass_number {int} -- number of passes
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enc_type {str} -- encoding type (twopass or crf)
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"""
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target_fps = int(target_fps)
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# avoid Frame rate very high for a muxer not efficiently supporting it.
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if target_fps > 90:
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target_fps = 90
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base_cmd = [
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settings.FFMPEG_COMMAND,
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"-y",
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"-i",
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input_file,
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"-c:v",
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encoder,
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"-filter:v",
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"scale=-2:" + str(target_height) + ",fps=fps=" + str(target_fps),
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# always convert to 4:2:0 -- FIXME: this could be also 4:2:2
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# but compatibility will suffer
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"-pix_fmt",
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"yuv420p",
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]
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if enc_type == "twopass":
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base_cmd.extend(["-b:v", str(target_rate) + "k"])
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elif enc_type == "crf":
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base_cmd.extend(["-crf", str(VIDEO_CRFS[codec])])
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if encoder == "libvpx-vp9":
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base_cmd.extend(["-b:v", str(target_rate) + "k"])
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if has_audio:
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base_cmd.extend(
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[
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"-c:a",
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audio_encoder,
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"-b:a",
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str(target_rate_audio) + "k",
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# stereo audio only, see https://trac.ffmpeg.org/ticket/5718
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"-ac",
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"2",
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]
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)
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# get keyframe distance in frames
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keyframe_distance = int(target_fps * KEYFRAME_DISTANCE)
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|
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# start building the command
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cmd = base_cmd[:]
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|
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# preset settings
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if encoder == "libvpx-vp9":
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if pass_number == 1:
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speed = 4
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|
else:
|
|
speed = VP9_SPEED
|
|
elif encoder in ["libx264"]:
|
|
preset = X26x_PRESET
|
|
elif encoder in ["libx265"]:
|
|
preset = X265_PRESET
|
|
if target_height >= 720:
|
|
preset = X26x_PRESET_BIG_HEIGHT
|
|
|
|
if encoder == "libx264":
|
|
level = "4.2" if target_height <= 1080 else "5.2"
|
|
|
|
x264_params = [
|
|
"keyint=" + str(keyframe_distance * 2),
|
|
"keyint_min=" + str(keyframe_distance),
|
|
]
|
|
|
|
cmd.extend(
|
|
[
|
|
"-maxrate",
|
|
str(int(int(target_rate) * MAX_RATE_MULTIPLIER)) + "k",
|
|
"-bufsize",
|
|
str(int(int(target_rate) * BUF_SIZE_MULTIPLIER)) + "k",
|
|
"-force_key_frames",
|
|
"expr:gte(t,n_forced*" + str(KEYFRAME_DISTANCE) + ")",
|
|
"-x264-params",
|
|
":".join(x264_params),
|
|
"-preset",
|
|
preset,
|
|
"-profile:v",
|
|
VIDEO_PROFILES[codec],
|
|
"-level",
|
|
level,
|
|
]
|
|
)
|
|
|
|
if enc_type == "twopass":
|
|
cmd.extend(["-passlogfile", pass_file, "-pass", pass_number])
|
|
|
|
elif encoder == "libx265":
|
|
x265_params = [
|
|
"vbv-maxrate=" + str(int(int(target_rate) * MAX_RATE_MULTIPLIER)),
|
|
"vbv-bufsize=" + str(int(int(target_rate) * BUF_SIZE_MULTIPLIER)),
|
|
"keyint=" + str(keyframe_distance * 2),
|
|
"keyint_min=" + str(keyframe_distance),
|
|
]
|
|
|
|
if enc_type == "twopass":
|
|
x265_params.extend(["stats=" + str(pass_file), "pass=" + str(pass_number)])
|
|
|
|
cmd.extend(
|
|
[
|
|
"-force_key_frames",
|
|
"expr:gte(t,n_forced*" + str(KEYFRAME_DISTANCE) + ")",
|
|
"-x265-params",
|
|
":".join(x265_params),
|
|
"-preset",
|
|
preset,
|
|
"-profile:v",
|
|
VIDEO_PROFILES[codec],
|
|
]
|
|
)
|
|
elif encoder == "libvpx-vp9":
|
|
cmd.extend(
|
|
[
|
|
"-g",
|
|
str(keyframe_distance),
|
|
"-keyint_min",
|
|
str(keyframe_distance),
|
|
"-maxrate",
|
|
str(int(int(target_rate) * MAX_RATE_MULTIPLIER)) + "k",
|
|
"-bufsize",
|
|
str(int(int(target_rate) * BUF_SIZE_MULTIPLIER)) + "k",
|
|
"-speed",
|
|
speed,
|
|
# '-deadline', 'realtime',
|
|
]
|
|
)
|
|
|
|
if enc_type == "twopass":
|
|
cmd.extend(["-passlogfile", pass_file, "-pass", pass_number])
|
|
|
|
cmd.extend(
|
|
[
|
|
"-strict",
|
|
"-2",
|
|
]
|
|
)
|
|
|
|
# end of the command
|
|
if pass_number == 1:
|
|
cmd.extend(["-an", "-f", "null", "/dev/null"])
|
|
elif pass_number == 2:
|
|
if output_file.endswith("mp4") and chunk:
|
|
cmd.extend(["-movflags", "+faststart"])
|
|
cmd.extend([output_file])
|
|
|
|
return cmd
|
|
|
|
|
|
def produce_ffmpeg_commands(media_file, media_info, resolution, codec, output_filename, pass_file, chunk=False):
|
|
try:
|
|
media_info = json.loads(media_info)
|
|
except BaseException:
|
|
media_info = {}
|
|
|
|
if codec == "h264":
|
|
encoder = "libx264"
|
|
# ext = "mp4"
|
|
elif codec in ["h265", "hevc"]:
|
|
encoder = "libx265"
|
|
# ext = "mp4"
|
|
elif codec == "vp9":
|
|
encoder = "libvpx-vp9"
|
|
# ext = "webm"
|
|
else:
|
|
return False
|
|
|
|
src_framerate = media_info.get("video_frame_rate", 30)
|
|
if src_framerate <= 30:
|
|
target_rate = VIDEO_BITRATES[codec][25].get(resolution)
|
|
else:
|
|
target_rate = VIDEO_BITRATES[codec][60].get(resolution)
|
|
if not target_rate: # INVESTIGATE MORE!
|
|
target_rate = VIDEO_BITRATES[codec][25].get(resolution)
|
|
if not target_rate:
|
|
return False
|
|
|
|
if media_info.get("video_height") < resolution:
|
|
if resolution not in [240, 360]: # always get these two
|
|
return False
|
|
|
|
# if codec == "h264_baseline":
|
|
# target_fps = 25
|
|
# else:
|
|
|
|
# adjust the target frame rate if the input is fractional
|
|
target_fps = src_framerate if isinstance(src_framerate, int) else math.ceil(src_framerate)
|
|
|
|
if media_info.get("video_duration") > CRF_ENCODING_NUM_SECONDS:
|
|
enc_type = "crf"
|
|
else:
|
|
enc_type = "twopass"
|
|
|
|
if enc_type == "twopass":
|
|
passes = [1, 2]
|
|
elif enc_type == "crf":
|
|
passes = [2]
|
|
|
|
cmds = []
|
|
for pass_number in passes:
|
|
cmds.append(
|
|
get_base_ffmpeg_command(
|
|
media_file,
|
|
output_file=output_filename,
|
|
has_audio=media_info.get("has_audio"),
|
|
codec=codec,
|
|
encoder=encoder,
|
|
audio_encoder=AUDIO_ENCODERS[codec],
|
|
target_fps=target_fps,
|
|
target_height=resolution,
|
|
target_rate=target_rate,
|
|
target_rate_audio=AUDIO_BITRATES[codec],
|
|
pass_file=pass_file,
|
|
pass_number=pass_number,
|
|
enc_type=enc_type,
|
|
chunk=chunk,
|
|
)
|
|
)
|
|
return cmds
|
|
|
|
|
|
def clean_query(query):
|
|
"""This is used to clear text in order to comply with SearchQuery
|
|
known exception cases
|
|
|
|
:param query: str - the query text that we want to clean
|
|
:return:
|
|
"""
|
|
|
|
if not query:
|
|
return ""
|
|
|
|
chars = ["^", "{", "}", "&", "|", "<", ">", '"', ")", "(", "!", ":", ";", "'", "#"]
|
|
for char in chars:
|
|
query = query.replace(char, "")
|
|
|
|
return query.lower()
|