X-Git-Url: https://git.immae.eu/?a=blobdiff_plain;f=server%2Fhelpers%2Fffmpeg-utils.ts;h=084516e553fd1a0395f24ced3ae8340e3fdcd622;hb=590a3b1e3ce78ce6e872536d806304547953e26e;hp=ff80991b2ccd3260fe1dcf37d9bec9d5f067b003;hpb=3a149e9f8b2e99507c72792b80cee3a90df003b2;p=github%2FChocobozzz%2FPeerTube.git diff --git a/server/helpers/ffmpeg-utils.ts b/server/helpers/ffmpeg-utils.ts index ff80991b2..084516e55 100644 --- a/server/helpers/ffmpeg-utils.ts +++ b/server/helpers/ffmpeg-utils.ts @@ -1,6 +1,6 @@ import * as ffmpeg from 'fluent-ffmpeg' import { dirname, join } from 'path' -import { getTargetBitrate, getMaxBitrate, VideoResolution } from '../../shared/models/videos' +import { getMaxBitrate, getTargetBitrate, VideoResolution } from '../../shared/models/videos' import { FFMPEG_NICE, VIDEO_TRANSCODING_FPS } from '../initializers/constants' import { processImage } from './image-utils' import { logger } from './logger' @@ -8,6 +8,71 @@ import { checkFFmpegEncoders } from '../initializers/checker-before-init' import { readFile, remove, writeFile } from 'fs-extra' import { CONFIG } from '../initializers/config' +/** + * A toolbox to play with audio + */ +namespace audio { + export const get = (videoPath: string) => { + // without position, ffprobe considers the last input only + // we make it consider the first input only + // if you pass a file path to pos, then ffprobe acts on that file directly + return new Promise<{ absolutePath: string, audioStream?: any }>((res, rej) => { + + function parseFfprobe (err: any, data: ffmpeg.FfprobeData) { + if (err) return rej(err) + + if ('streams' in data) { + const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio') + if (audioStream) { + return res({ + absolutePath: data.format.filename, + audioStream + }) + } + } + + return res({ absolutePath: data.format.filename }) + } + + return ffmpeg.ffprobe(videoPath, parseFfprobe) + }) + } + + export namespace bitrate { + const baseKbitrate = 384 + + const toBits = (kbits: number) => kbits * 8000 + + export const aac = (bitrate: number): number => { + switch (true) { + case bitrate > toBits(baseKbitrate): + return baseKbitrate + + default: + return -1 // we interpret it as a signal to copy the audio stream as is + } + } + + export const mp3 = (bitrate: number): number => { + /* + a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac. + That's why, when using aac, we can go to lower kbit/sec. The equivalences + made here are not made to be accurate, especially with good mp3 encoders. + */ + switch (true) { + case bitrate <= toBits(192): + return 128 + + case bitrate <= toBits(384): + return 256 + + default: + return baseKbitrate + } + } + } +} + function computeResolutionsToTranscode (videoFileHeight: number) { const resolutionsEnabled: number[] = [] const configResolutions = CONFIG.TRANSCODING.RESOLUTIONS @@ -24,7 +89,7 @@ function computeResolutionsToTranscode (videoFileHeight: number) { ] for (const resolution of resolutions) { - if (configResolutions[ resolution + 'p' ] === true && videoFileHeight > resolution) { + if (configResolutions[resolution + 'p'] === true && videoFileHeight > resolution) { resolutionsEnabled.push(resolution) } } @@ -32,7 +97,7 @@ function computeResolutionsToTranscode (videoFileHeight: number) { return resolutionsEnabled } -async function getVideoFileSize (path: string) { +async function getVideoStreamSize (path: string) { const videoStream = await getVideoStreamFromFile(path) return videoStream === null @@ -40,8 +105,45 @@ async function getVideoFileSize (path: string) { : { width: videoStream.width, height: videoStream.height } } +async function getVideoStreamCodec (path: string) { + const videoStream = await getVideoStreamFromFile(path) + + if (!videoStream) return '' + + const videoCodec = videoStream.codec_tag_string + + const baseProfileMatrix = { + High: '6400', + Main: '4D40', + Baseline: '42E0' + } + + let baseProfile = baseProfileMatrix[videoStream.profile] + if (!baseProfile) { + logger.warn('Cannot get video profile codec of %s.', path, { videoStream }) + baseProfile = baseProfileMatrix['High'] // Fallback + } + + const level = videoStream.level.toString(16) + + return `${videoCodec}.${baseProfile}${level}` +} + +async function getAudioStreamCodec (path: string) { + const { audioStream } = await audio.get(path) + + if (!audioStream) return '' + + const audioCodec = audioStream.codec_name + if (audioCodec === 'aac') return 'mp4a.40.2' + + logger.warn('Cannot get audio codec of %s.', path, { audioStream }) + + return 'mp4a.40.2' // Fallback +} + async function getVideoFileResolution (path: string) { - const size = await getVideoFileSize(path) + const size = await getVideoStreamSize(path) return { videoFileResolution: Math.min(size.height, size.width), @@ -54,7 +156,7 @@ async function getVideoFileFPS (path: string) { if (videoStream === null) return 0 for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) { - const valuesText: string = videoStream[ key ] + const valuesText: string = videoStream[key] if (!valuesText) continue const [ frames, seconds ] = valuesText.split('/') @@ -154,7 +256,8 @@ interface OnlyAudioTranscodeOptions extends BaseTranscodeOptions { type: 'only-audio' } -type TranscodeOptions = HLSTranscodeOptions +type TranscodeOptions = + HLSTranscodeOptions | VideoTranscodeOptions | MergeAudioTranscodeOptions | OnlyAudioTranscodeOptions @@ -167,13 +270,13 @@ function transcode (options: TranscodeOptions) { .output(options.outputPath) if (options.type === 'quick-transcode') { - command = await buildQuickTranscodeCommand(command) + command = buildQuickTranscodeCommand(command) } else if (options.type === 'hls') { command = await buildHLSCommand(command, options) } else if (options.type === 'merge-audio') { command = await buildAudioMergeCommand(command, options) } else if (options.type === 'only-audio') { - command = await buildOnlyAudioCommand(command, options) + command = buildOnlyAudioCommand(command, options) } else { command = await buildx264Command(command, options) } @@ -210,26 +313,33 @@ async function canDoQuickTranscode (path: string): Promise { // check video params if (videoStream == null) return false - if (videoStream[ 'codec_name' ] !== 'h264') return false - if (videoStream[ 'pix_fmt' ] !== 'yuv420p') return false + if (videoStream['codec_name'] !== 'h264') return false + if (videoStream['pix_fmt'] !== 'yuv420p') return false if (fps < VIDEO_TRANSCODING_FPS.MIN || fps > VIDEO_TRANSCODING_FPS.MAX) return false if (bitRate > getMaxBitrate(resolution.videoFileResolution, fps, VIDEO_TRANSCODING_FPS)) return false // check audio params (if audio stream exists) if (parsedAudio.audioStream) { - if (parsedAudio.audioStream[ 'codec_name' ] !== 'aac') return false + if (parsedAudio.audioStream['codec_name'] !== 'aac') return false - const maxAudioBitrate = audio.bitrate[ 'aac' ](parsedAudio.audioStream[ 'bit_rate' ]) - if (maxAudioBitrate !== -1 && parsedAudio.audioStream[ 'bit_rate' ] > maxAudioBitrate) return false + const maxAudioBitrate = audio.bitrate['aac'](parsedAudio.audioStream['bit_rate']) + if (maxAudioBitrate !== -1 && parsedAudio.audioStream['bit_rate'] > maxAudioBitrate) return false } return true } +function getClosestFramerateStandard (fps: number, type: 'HD_STANDARD' | 'STANDARD'): number { + return VIDEO_TRANSCODING_FPS[type].slice(0) + .sort((a, b) => fps % a - fps % b)[0] +} + // --------------------------------------------------------------------------- export { - getVideoFileSize, + getVideoStreamCodec, + getAudioStreamCodec, + getVideoStreamSize, getVideoFileResolution, getDurationFromVideoFile, generateImageFromVideoFile, @@ -247,13 +357,14 @@ export { async function buildx264Command (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) { let fps = await getVideoFileFPS(options.inputPath) - // On small/medium resolutions, limit FPS if ( + // On small/medium resolutions, limit FPS options.resolution !== undefined && options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN && fps > VIDEO_TRANSCODING_FPS.AVERAGE ) { - fps = VIDEO_TRANSCODING_FPS.AVERAGE + // Get closest standard framerate by modulo: downsampling has to be done to a divisor of the nominal fps value + fps = getClosestFramerateStandard(fps, 'STANDARD') } command = await presetH264(command, options.inputPath, options.resolution, fps) @@ -266,7 +377,7 @@ async function buildx264Command (command: ffmpeg.FfmpegCommand, options: Transco if (fps) { // Hard FPS limits - if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = VIDEO_TRANSCODING_FPS.MAX + if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = getClosestFramerateStandard(fps, 'HD_STANDARD') else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN command = command.withFPS(fps) @@ -288,14 +399,14 @@ async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: M return command } -async function buildOnlyAudioCommand (command: ffmpeg.FfmpegCommand, options: OnlyAudioTranscodeOptions) { - command = await presetOnlyAudio(command) +function buildOnlyAudioCommand (command: ffmpeg.FfmpegCommand, options: OnlyAudioTranscodeOptions) { + command = presetOnlyAudio(command) return command } -async function buildQuickTranscodeCommand (command: ffmpeg.FfmpegCommand) { - command = await presetCopy(command) +function buildQuickTranscodeCommand (command: ffmpeg.FfmpegCommand) { + command = presetCopy(command) command = command.outputOption('-map_metadata -1') // strip all metadata .outputOption('-movflags faststart') @@ -306,7 +417,7 @@ async function buildQuickTranscodeCommand (command: ffmpeg.FfmpegCommand) { async function buildHLSCommand (command: ffmpeg.FfmpegCommand, options: HLSTranscodeOptions) { const videoPath = getHLSVideoPath(options) - if (options.copyCodecs) command = await presetCopy(command) + if (options.copyCodecs) command = presetCopy(command) else command = await buildx264Command(command, options) command = command.outputOption('-hls_time 4') @@ -373,71 +484,6 @@ async function presetH264VeryFast (command: ffmpeg.FfmpegCommand, input: string, return localCommand } -/** - * A toolbox to play with audio - */ -namespace audio { - export const get = (videoPath: string) => { - // without position, ffprobe considers the last input only - // we make it consider the first input only - // if you pass a file path to pos, then ffprobe acts on that file directly - return new Promise<{ absolutePath: string, audioStream?: any }>((res, rej) => { - - function parseFfprobe (err: any, data: ffmpeg.FfprobeData) { - if (err) return rej(err) - - if ('streams' in data) { - const audioStream = data.streams.find(stream => stream[ 'codec_type' ] === 'audio') - if (audioStream) { - return res({ - absolutePath: data.format.filename, - audioStream - }) - } - } - - return res({ absolutePath: data.format.filename }) - } - - return ffmpeg.ffprobe(videoPath, parseFfprobe) - }) - } - - export namespace bitrate { - const baseKbitrate = 384 - - const toBits = (kbits: number) => kbits * 8000 - - export const aac = (bitrate: number): number => { - switch (true) { - case bitrate > toBits(baseKbitrate): - return baseKbitrate - - default: - return -1 // we interpret it as a signal to copy the audio stream as is - } - } - - export const mp3 = (bitrate: number): number => { - /* - a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac. - That's why, when using aac, we can go to lower kbit/sec. The equivalences - made here are not made to be accurate, especially with good mp3 encoders. - */ - switch (true) { - case bitrate <= toBits(192): - return 128 - - case bitrate <= toBits(384): - return 256 - - default: - return baseKbitrate - } - } - } -} - /** * Standard profile, with variable bitrate audio and faststart. * @@ -448,8 +494,8 @@ async function presetH264 (command: ffmpeg.FfmpegCommand, input: string, resolut let localCommand = command .format('mp4') .videoCodec('libx264') - .outputOption('-level 3.1') // 3.1 is the minimal ressource allocation for our highest supported resolution - .outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorythm, 16 is optimal B-frames for it + .outputOption('-level 3.1') // 3.1 is the minimal resource allocation for our highest supported resolution + .outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorithm, 16 is optimal B-frames for it .outputOption('-bf 16') // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16 .outputOption('-pix_fmt yuv420p') // allows import of source material with incompatible pixel formats (e.g. MJPEG video) .outputOption('-map_metadata -1') // strip all metadata @@ -468,10 +514,10 @@ async function presetH264 (command: ffmpeg.FfmpegCommand, input: string, resolut // of course this is far from perfect, but it might save some space in the end localCommand = localCommand.audioCodec('aac') - const audioCodecName = parsedAudio.audioStream[ 'codec_name' ] + const audioCodecName = parsedAudio.audioStream['codec_name'] - if (audio.bitrate[ audioCodecName ]) { - const bitrate = audio.bitrate[ audioCodecName ](parsedAudio.audioStream[ 'bit_rate' ]) + if (audio.bitrate[audioCodecName]) { + const bitrate = audio.bitrate[audioCodecName](parsedAudio.audioStream['bit_rate']) if (bitrate !== undefined && bitrate !== -1) localCommand = localCommand.audioBitrate(bitrate) } } @@ -492,14 +538,14 @@ async function presetH264 (command: ffmpeg.FfmpegCommand, input: string, resolut return localCommand } -async function presetCopy (command: ffmpeg.FfmpegCommand): Promise { +function presetCopy (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand { return command .format('mp4') .videoCodec('copy') .audioCodec('copy') } -async function presetOnlyAudio (command: ffmpeg.FfmpegCommand): Promise { +function presetOnlyAudio (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand { return command .format('mp4') .audioCodec('copy')