forked from LBRYCommunity/lbry-sdk
455 lines
19 KiB
Python
455 lines
19 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 platform
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import re
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import shlex
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import shutil
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import subprocess
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import lbry.utils
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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 _replace_or_pop_env(self, variable):
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if variable + '_ORIG' in self._env_copy:
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self._env_copy[variable] = self._env_copy[variable + '_ORIG']
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else:
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self._env_copy.pop(variable, None)
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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 = None
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self._which_ffmpeg = None
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self._which_ffprobe = None
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self._env_copy = dict(os.environ)
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self._checked_ffmpeg = False
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if lbry.utils.is_running_from_bundle():
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# handle the situation where PyInstaller overrides our runtime environment:
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self._replace_or_pop_env('LD_LIBRARY_PATH')
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@staticmethod
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def _execute(command, environment):
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# log.debug("Executing: %s", command)
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try:
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with subprocess.Popen(
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shlex.split(command) if platform.system() != 'Windows' else command,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=environment
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) as process:
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(stdout, stderr) = process.communicate() # blocks until the process exits
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return stdout.decode(errors='replace') + stderr.decode(errors='replace'), process.returncode
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except subprocess.SubprocessError as e:
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return str(e), -1
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# This create_subprocess_exec call is broken in Windows Python 3.7, but it's prettier than what's here.
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# The recommended fix is switching to ProactorEventLoop, but that breaks UDP in Linux Python 3.7.
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# We work around that issue here by using run_in_executor. Check it again in Python 3.8.
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async def _execute_ffmpeg(self, arguments):
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arguments = self._which_ffmpeg + " " + arguments
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return await asyncio.get_event_loop().run_in_executor(None, self._execute, arguments, self._env_copy)
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async def _execute_ffprobe(self, arguments):
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arguments = self._which_ffprobe + " " + arguments
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return await asyncio.get_event_loop().run_in_executor(None, self._execute, arguments, self._env_copy)
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async def _verify_executables(self):
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try:
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await self._execute_ffprobe("-version")
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version, code = await self._execute_ffmpeg("-version")
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except Exception as e:
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code = -1
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version = str(e)
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if code != 0 or not version.startswith("ffmpeg"):
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log.warning("Unable to run ffmpeg, but it was requested. Code: %d; Message: %s", code, version)
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raise FileNotFoundError(f"Unable to locate or run ffmpeg or ffprobe. Please install FFmpeg "
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f"and ensure that it is callable via PATH or conf.ffmpeg_path")
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log.debug("Using %s at %s", version.splitlines()[0].split(" Copyright")[0], self._which_ffmpeg)
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return version
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@staticmethod
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def _which_ffmpeg_and_ffmprobe(path):
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return shutil.which("ffmpeg", path=path), shutil.which("ffprobe", path=path)
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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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self._ffmpeg_installed = False
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path = self._conf.ffmpeg_path
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if hasattr(self._conf, "data_dir"):
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path += os.path.pathsep + os.path.join(getattr(self._conf, "data_dir"), "ffmpeg", "bin")
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path += os.path.pathsep + self._env_copy.get("PATH", "")
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self._which_ffmpeg, self._which_ffprobe = await asyncio.get_running_loop().run_in_executor(
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None, self._which_ffmpeg_and_ffmprobe, path
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)
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if not self._which_ffmpeg:
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log.warning("Unable to locate ffmpeg executable. Path: %s", path)
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raise FileNotFoundError(f"Unable to locate ffmpeg executable. Path: {path}")
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if not self._which_ffprobe:
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log.warning("Unable to locate ffprobe executable. Path: %s", path)
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raise FileNotFoundError(f"Unable to locate ffprobe executable. Path: {path}")
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if os.path.dirname(self._which_ffmpeg) != os.path.dirname(self._which_ffprobe):
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log.warning("ffmpeg and ffprobe are in different folders!")
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await self._verify_executables()
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self._ffmpeg_installed = True
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async def status(self, reset=False, recheck=False):
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if reset:
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self._available_encoders = ""
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self._ffmpeg_installed = None
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if self._checked_ffmpeg and not recheck:
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pass
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elif self._ffmpeg_installed is None:
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try:
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await self._verify_ffmpeg_installed()
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except FileNotFoundError:
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pass
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self._checked_ffmpeg = True
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return {
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"available": self._ffmpeg_installed,
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"which": self._which_ffmpeg,
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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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splits = container.split(",")
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if not {"webm", "mp4", "3gp", "ogg"}.intersection(splits):
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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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if "matroska" in splits:
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for stream in scan_data["streams"]:
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if stream["codec_type"] == "video":
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codec = stream["codec_name"]
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if not {"vp8", "vp9", "av1"}.intersection(codec.split(",")):
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return "WebM format requires VP8/9 or AV1 video. " \
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f"Actual: {codec} [{stream['codec_long_name']}]"
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elif stream["codec_type"] == "audio":
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codec = stream["codec_name"]
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if not {"vorbis", "opus"}.intersection(codec.split(",")):
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return "WebM format requires Vorbis or Opus audio. " \
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f"Actual: {codec} [{stream['codec_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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def _verify_bitrate(self, scan_data: json, file_path):
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bit_rate_max = float(self._conf.video_bitrate_maximum)
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if bit_rate_max <= 0:
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return ""
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if "bit_rate" in scan_data["format"]:
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bit_rate = float(scan_data["format"]["bit_rate"])
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else:
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bit_rate = os.stat(file_path).st_size / float(scan_data["format"]["duration"])
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log.debug(" Detected bitrate is %s Mbps. Allowed max: %s Mbps",
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str(bit_rate / 1000000.0), str(bit_rate_max / 1000000.0))
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if bit_rate > bit_rate_max:
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return "The bit rate is above the configured maximum. Actual: " \
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f"{bit_rate / 1000000.0} Mbps; Allowed max: {bit_rate_max / 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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def _get_video_scaler(self):
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return self._conf.video_scaler
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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 video_encoder: # not re-encoding video
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if "theora" in video_encoder:
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return "ogv"
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if 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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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 "ogv"
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if {"vp8", "vp9", "av1"}.intersection(codec):
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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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arguments = f'-v quiet -print_format json -show_format -show_streams "{file_path}"'
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result, _ = await self._execute_ffprobe(arguments)
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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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raise ValueError(f'Absent or unreadable video file: {file_path}')
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if "format" not in scan_data or "duration" not in scan_data["format"]:
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log.debug("Format data is missing from ffprobe results for: %s", file_path)
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raise ValueError(f'Media file does not appear to contain video content: {file_path}')
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if float(scan_data["format"]["duration"]) < 0.1:
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log.debug("Media file appears to be an image: %s", file_path)
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raise ValueError(f'Assuming image file at: {file_path}')
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return scan_data
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@staticmethod
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def _build_spec(scan_data):
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assert scan_data
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duration = float(scan_data["format"]["duration"]) # existence verified when scan_data made
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width = -1
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height = -1
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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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width = max(width, int(stream["width"]))
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height = max(height, int(stream["height"]))
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log.debug(" Detected duration: %f sec. with resolution: %d x %d", duration, width, height)
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spec = {"duration": duration}
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if height >= 0:
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spec["height"] = height
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if width >= 0:
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spec["width"] = width
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return spec
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async def verify_or_repair(self, validate, repair, file_path, ignore_non_video=False):
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if not validate and not repair:
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return file_path, {}
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if ignore_non_video and not file_path:
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return file_path, {}
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await self._verify_ffmpeg_installed()
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try:
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scan_data = await self._get_scan_data(validate, file_path)
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except ValueError:
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if ignore_non_video:
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return file_path, {}
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raise
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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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spec = self._build_spec(scan_data)
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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, file_path)
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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, spec
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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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# could do the scaling only if bitrate_msg, but if we're going to the effort to re-encode anyway...
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transcode_command.append(self._get_video_scaler())
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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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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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path = pathlib.Path(file_path)
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output = path.parent / f"{path.stem}_fixed.{extension}"
|
|
transcode_command.append(f'"{output}"')
|
|
|
|
ffmpeg_command = " ".join(transcode_command)
|
|
log.info("Proceeding on transcode via: ffmpeg %s", ffmpeg_command)
|
|
result, code = await self._execute_ffmpeg(ffmpeg_command)
|
|
if code != 0:
|
|
raise Exception(f"Failure to complete the transcode command. Output: {result}")
|
|
except Exception as e:
|
|
if validate:
|
|
raise
|
|
log.info("Unable to transcode %s . Message: %s", file_path, str(e))
|
|
# TODO: delete partial output file here if it exists?
|
|
return file_path, spec
|
|
|
|
return str(output), spec
|