forked from LBRYCommunity/lbry-sdk
354 lines
15 KiB
Python
354 lines
15 KiB
Python
import asyncio
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import json
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import logging
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import os
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import pathlib
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import re
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import shlex
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import shutil
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from lbry.conf import TranscodeConfig
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log = logging.getLogger(__name__)
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class VideoFileAnalyzer:
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def __init__(self, conf: TranscodeConfig):
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self._conf = conf
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self._available_encoders = ""
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self._ffmpeg_installed = False
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self._which = None
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async def _execute(self, command, arguments):
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args = shlex.split(arguments)
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process = await asyncio.create_subprocess_exec(self._conf.ffmpeg_folder + command, *args,
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stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE)
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stdout, stderr = await process.communicate() # returns when the streams are closed
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return stdout.decode(errors='replace') + stderr.decode(errors='replace'), process.returncode
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async def _verify_executable(self, name):
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try:
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version, code = await self._execute(name, "-version")
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except Exception as e:
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log.warning("Unable to run %s, but it was requested. Message: %s", name, str(e))
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code = -1
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version = ""
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if code != 0 or not version.startswith(name):
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raise FileNotFoundError(f"Unable to locate or run {name}. Please install FFmpeg "
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f"and ensure that it is callable via PATH or conf.ffmpeg_folder")
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return version
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async def _verify_ffmpeg_installed(self):
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if self._ffmpeg_installed:
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return
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await self._verify_executable("ffprobe")
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version = await self._verify_executable("ffmpeg")
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self._which = shutil.which(f"{self._conf.ffmpeg_folder}ffmpeg")
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self._ffmpeg_installed = True
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log.debug("Using %s at %s", version.splitlines()[0].split(" Copyright")[0], self._which)
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async def status(self, reset=False):
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if reset:
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self._available_encoders = ""
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self._ffmpeg_installed = False
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self._which = None
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installed = True
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try:
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await self._verify_ffmpeg_installed()
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except FileNotFoundError:
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installed = False
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return {
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"available": installed,
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"which": self._which,
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"analyze_audio_volume": int(self._conf.volume_analysis_time) > 0
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}
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@staticmethod
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def _verify_container(scan_data: json):
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container = scan_data["format"]["format_name"]
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log.debug(" Detected container is %s", container)
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if not {"webm", "mp4", "3gp", "ogg"}.intersection(container.split(",")):
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return "Container format is not in the approved list of WebM, MP4. " \
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f"Actual: {container} [{scan_data['format']['format_long_name']}]"
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return ""
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@staticmethod
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def _verify_video_encoding(scan_data: json):
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for stream in scan_data["streams"]:
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if stream["codec_type"] != "video":
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continue
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codec = stream["codec_name"]
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log.debug(" Detected video codec is %s, format is %s", codec, stream["pix_fmt"])
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if not {"h264", "vp8", "vp9", "av1", "theora"}.intersection(codec.split(",")):
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return "Video codec is not in the approved list of H264, VP8, VP9, AV1, Theora. " \
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f"Actual: {codec} [{stream['codec_long_name']}]"
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if "h264" in codec.split(",") and stream["pix_fmt"] != "yuv420p":
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return "Video codec is H264, but its pixel format does not match the approved yuv420p. " \
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f"Actual: {stream['pix_fmt']}"
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return ""
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@staticmethod
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def _verify_bitrate(scan_data: json):
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if "bit_rate" not in scan_data["format"]:
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return ""
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bit_rate = float(scan_data["format"]["bit_rate"])
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log.debug(" Detected bitrate is %s Mbps", str(bit_rate / 1000000.0))
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pixels = -1.0
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for stream in scan_data["streams"]:
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if stream["codec_type"] == "video":
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pieces = stream["r_frame_rate"].split('/', 1)
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frame_rate = float(pieces[0]) if len(pieces) == 1 \
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else float(pieces[0]) / float(pieces[1])
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pixels = max(pixels, float(stream["height"]) * float(stream["width"]) * frame_rate)
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if pixels > 0.0 and pixels / bit_rate < 3.0:
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return "Bits per second is excessive for this data; this may impact web streaming performance. " \
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f"Actual: {str(bit_rate / 1000000.0)} Mbps"
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return ""
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async def _verify_fast_start(self, scan_data: json, video_file):
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container = scan_data["format"]["format_name"]
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if {"webm", "ogg"}.intersection(container.split(",")):
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return ""
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result, _ = await self._execute("ffprobe", f'-v debug "{video_file}"')
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match = re.search(r"Before avformat_find_stream_info.+?\s+seeks:(\d+)\s+", result)
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if match and int(match.group(1)) != 0:
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return "Video stream descriptors are not at the start of the file (the faststart flag was not used)."
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return ""
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@staticmethod
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def _verify_audio_encoding(scan_data: json):
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for stream in scan_data["streams"]:
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if stream["codec_type"] != "audio":
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continue
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codec = stream["codec_name"]
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log.debug(" Detected audio codec is %s", codec)
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if not {"aac", "mp3", "flac", "vorbis", "opus"}.intersection(codec.split(",")):
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return "Audio codec is not in the approved list of AAC, FLAC, MP3, Vorbis, and Opus. " \
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f"Actual: {codec} [{stream['codec_long_name']}]"
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return ""
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async def _verify_audio_volume(self, seconds, video_file):
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try:
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validate_volume = int(seconds) > 0
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except ValueError:
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validate_volume = False
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if not validate_volume:
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return ""
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result, _ = await self._execute("ffmpeg", f'-i "{video_file}" -t {seconds} '
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f'-af volumedetect -vn -sn -dn -f null "{os.devnull}"')
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try:
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mean_volume = float(re.search(r"mean_volume:\s+([-+]?\d*\.\d+|\d+)", result).group(1))
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max_volume = float(re.search(r"max_volume:\s+([-+]?\d*\.\d+|\d+)", result).group(1))
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except Exception as e:
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log.debug(" Failure in volume analysis. Message: %s", str(e))
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return ""
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if max_volume < -5.0 and mean_volume < -22.0:
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return "Audio is at least five dB lower than prime. " \
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f"Actual max: {max_volume}, mean: {mean_volume}"
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log.debug(" Detected audio volume has mean, max of %f, %f dB", mean_volume, max_volume)
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return ""
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@staticmethod
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def _compute_crf(scan_data):
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height = 240.0
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for stream in scan_data["streams"]:
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if stream["codec_type"] == "video":
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height = max(height, float(stream["height"]))
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# https://developers.google.com/media/vp9/settings/vod/
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return int(-0.011 * height + 40)
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async def _get_video_encoder(self, scan_data):
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# use what the user said if it's there:
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# if it's not there, use h264 if we can because it's way faster than the others
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# if we don't have h264 use vp9; it's fairly compatible even though it's slow
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if not self._available_encoders:
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self._available_encoders, _ = await self._execute("ffmpeg", "-encoders -v quiet")
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encoder = self._conf.video_encoder.split(" ", 1)[0]
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if re.search(fr"^\s*V..... {encoder} ", self._available_encoders, re.MULTILINE):
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return self._conf.video_encoder
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if re.search(r"^\s*V..... libx264 ", self._available_encoders, re.MULTILINE):
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if encoder:
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log.warning(" Using libx264 since the requested encoder was unavailable. Requested: %s", encoder)
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return 'libx264 -crf 19 -vf "format=yuv420p"'
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if not encoder:
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encoder = "libx264"
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if re.search(r"^\s*V..... libvpx-vp9 ", self._available_encoders, re.MULTILINE):
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log.warning(" Using libvpx-vp9 since the requested encoder was unavailable. Requested: %s", encoder)
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crf = self._compute_crf(scan_data)
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return f"libvpx-vp9 -crf {crf} -b:v 0"
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if re.search(r"^\s*V..... libtheora", self._available_encoders, re.MULTILINE):
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log.warning(" Using libtheora since the requested encoder was unavailable. Requested: %s", encoder)
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return "libtheora -q:v 7"
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raise Exception(f"The video encoder is not available. Requested: {encoder}")
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async def _get_audio_encoder(self, extension):
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# if the video encoding is theora or av1/vp8/vp9 use opus (or fallback to vorbis)
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# or we don't have a video encoding but we have an ogg or webm container use opus
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# if we need to use opus/vorbis see if the conf file has it else use our own params
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# else use the user-set value if it exists
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# else use aac
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wants_opus = extension != "mp4"
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if not self._available_encoders:
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self._available_encoders, _ = await self._execute("ffmpeg", "-encoders -v quiet")
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encoder = self._conf.audio_encoder.split(" ", 1)[0]
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if wants_opus and 'opus' in encoder:
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return self._conf.audio_encoder
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if wants_opus and re.search(r"^\s*A..... libopus ", self._available_encoders, re.MULTILINE):
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return "libopus -b:a 160k"
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if wants_opus and 'vorbis' in encoder:
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return self._conf.audio_encoder
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if wants_opus and re.search(r"^\s*A..... libvorbis ", self._available_encoders, re.MULTILINE):
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return "libvorbis -q:a 6"
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if re.search(fr"^\s*A..... {encoder} ", self._available_encoders, re.MULTILINE):
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return self._conf.audio_encoder
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if re.search(r"^\s*A..... aac ", self._available_encoders, re.MULTILINE):
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return "aac -b:a 192k"
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raise Exception(f"The audio encoder is not available. Requested: {encoder or 'aac'}")
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async def _get_volume_filter(self):
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return self._conf.volume_filter if self._conf.volume_filter else "-af loudnorm"
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@staticmethod
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def _get_best_container_extension(scan_data, video_encoder):
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# the container is chosen by the video format
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# if we are theora-encoded, we want ogg
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# if we are vp8/vp9/av1 we want webm
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# use mp4 for anything else
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if not video_encoder: # not re-encoding video
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for stream in scan_data["streams"]:
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if stream["codec_type"] != "video":
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continue
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codec = stream["codec_name"].split(",")
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if "theora" in codec:
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return "ogg"
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if {"vp8", "vp9", "av1"}.intersection(codec):
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return "webm"
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if "theora" in video_encoder:
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return "ogg"
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elif re.search(r"vp[89x]|av1", video_encoder.split(" ", 1)[0]):
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return "webm"
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return "mp4"
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async def _get_scan_data(self, validate, file_path):
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result, _ = await self._execute("ffprobe",
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f'-v quiet -print_format json -show_format -show_streams "{file_path}"')
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try:
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scan_data = json.loads(result)
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except Exception as e:
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log.debug("Failure in JSON parsing ffprobe results. Message: %s", str(e))
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if validate:
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raise Exception(f'Invalid video file: {file_path}')
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log.info("Unable to optimize %s . FFmpeg output was unreadable.", file_path)
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return
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if "format" not in scan_data:
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if validate:
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raise FileNotFoundError(f'Unexpected or absent video file contents at: {file_path}')
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log.info("Unable to optimize %s . FFmpeg output is missing the format section.", file_path)
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return
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return scan_data
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async def verify_or_repair(self, validate, repair, file_path):
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if not validate and not repair:
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return file_path
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await self._verify_ffmpeg_installed()
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scan_data = await self._get_scan_data(validate, file_path)
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fast_start_msg = await self._verify_fast_start(scan_data, file_path)
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log.debug("Analyzing %s:", file_path)
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log.debug(" Detected faststart is %s", "false" if fast_start_msg else "true")
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container_msg = self._verify_container(scan_data)
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bitrate_msg = self._verify_bitrate(scan_data)
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video_msg = self._verify_video_encoding(scan_data)
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audio_msg = self._verify_audio_encoding(scan_data)
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volume_msg = await self._verify_audio_volume(self._conf.volume_analysis_time, file_path)
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messages = [container_msg, bitrate_msg, fast_start_msg, video_msg, audio_msg, volume_msg]
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if not any(messages):
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return file_path
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if not repair:
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errors = ["Streamability verification failed:"]
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errors.extend(filter(None, messages))
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raise Exception("\n ".join(errors))
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# the plan for transcoding:
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# we have to re-encode the video if it is in a nonstandard format
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# we also re-encode if we are h264 but not yuv420p (both errors caught in video_msg)
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# we also re-encode if our bitrate is too high
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try:
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transcode_command = [f'-i "{file_path}" -y -c:s copy -c:d copy -c:v']
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video_encoder = ""
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if video_msg or bitrate_msg:
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video_encoder = await self._get_video_encoder(scan_data)
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transcode_command.append(video_encoder)
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else:
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transcode_command.append("copy")
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transcode_command.append("-movflags +faststart -c:a")
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path = pathlib.Path(file_path)
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extension = self._get_best_container_extension(scan_data, video_encoder)
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if audio_msg or volume_msg:
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audio_encoder = await self._get_audio_encoder(extension)
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transcode_command.append(audio_encoder)
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if volume_msg:
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volume_filter = await self._get_volume_filter()
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transcode_command.append(volume_filter)
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else:
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transcode_command.append("copy")
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# TODO: put it in a temp folder and delete it after we upload?
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output = path.parent / f"{path.stem}_fixed.{extension}"
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transcode_command.append(f'"{output}"')
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ffmpeg_command = " ".join(transcode_command)
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log.info("Proceeding on transcode via: ffmpeg %s", ffmpeg_command)
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result, code = await self._execute("ffmpeg", ffmpeg_command)
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if code != 0:
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raise Exception(f"Failure to complete the transcode command. Output: {result}")
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except Exception as e:
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if validate:
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raise
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log.info("Unable to transcode %s . Message: %s", file_path, str(e))
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# TODO: delete partial output file here if it exists?
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return file_path
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return str(output)
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