X-Git-Url: https://git.immae.eu/?a=blobdiff_plain;f=server%2Fhelpers%2Fffmpeg-utils.ts;h=fac2595f1001559e79d7a5e0212cf177fdca77f4;hb=c6c0fa6cd8fe8f752463d8982c3dbcd448739c4e;hp=132f4690ec715063fa1abcdd56e0450a553cbe2c;hpb=73471b1a52f242e86364ffb077ea6cadb3b07ae2;p=github%2FChocobozzz%2FPeerTube.git diff --git a/server/helpers/ffmpeg-utils.ts b/server/helpers/ffmpeg-utils.ts index 132f4690e..fac2595f1 100644 --- a/server/helpers/ffmpeg-utils.ts +++ b/server/helpers/ffmpeg-utils.ts @@ -1,27 +1,99 @@ import * as ffmpeg from 'fluent-ffmpeg' -import { join } from 'path' -import { getTargetBitrate, VideoResolution } from '../../shared/models/videos' -import { CONFIG, FFMPEG_NICE, VIDEO_TRANSCODING_FPS } from '../initializers/constants' +import { readFile, remove, writeFile } from 'fs-extra' +import { dirname, join } from 'path' +import { VideoFileMetadata } from '@shared/models/videos/video-file-metadata' +import { getMaxBitrate, getTargetBitrate, VideoResolution } from '../../shared/models/videos' +import { checkFFmpegEncoders } from '../initializers/checker-before-init' +import { CONFIG } from '../initializers/config' +import { FFMPEG_NICE, VIDEO_TRANSCODING_FPS } from '../initializers/constants' import { processImage } from './image-utils' import { logger } from './logger' -import { checkFFmpegEncoders } from '../initializers/checker-before-init' -import { remove } from 'fs-extra' -function computeResolutionsToTranscode (videoFileHeight: number) { +/** + * 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 (videoFileResolution: number, type: 'vod' | 'live') { + const configResolutions = type === 'vod' + ? CONFIG.TRANSCODING.RESOLUTIONS + : CONFIG.LIVE.TRANSCODING.RESOLUTIONS + const resolutionsEnabled: number[] = [] - const configResolutions = CONFIG.TRANSCODING.RESOLUTIONS // Put in the order we want to proceed jobs const resolutions = [ + VideoResolution.H_NOVIDEO, VideoResolution.H_480P, VideoResolution.H_360P, VideoResolution.H_720P, VideoResolution.H_240P, - VideoResolution.H_1080P + VideoResolution.H_1080P, + VideoResolution.H_4K ] for (const resolution of resolutions) { - if (configResolutions[ resolution + 'p' ] === true && videoFileHeight > resolution) { + if (configResolutions[resolution + 'p'] === true && videoFileResolution > resolution) { resolutionsEnabled.push(resolution) } } @@ -29,17 +101,64 @@ function computeResolutionsToTranscode (videoFileHeight: number) { return resolutionsEnabled } +async function getVideoStreamSize (path: string) { + const videoStream = await getVideoStreamFromFile(path) + + return videoStream === null + ? { width: 0, height: 0 } + : { 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 + } + + let level = videoStream.level.toString(16) + if (level.length === 1) level = `0${level}` + + return `${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 videoStream = await getVideoFileStream(path) + const size = await getVideoStreamSize(path) return { - videoFileResolution: Math.min(videoStream.height, videoStream.width), - isPortraitMode: videoStream.height > videoStream.width + videoFileResolution: Math.min(size.height, size.width), + isPortraitMode: size.height > size.width } } async function getVideoFileFPS (path: string) { - const videoStream = await getVideoFileStream(path) + const videoStream = await getVideoStreamFromFile(path) + if (videoStream === null) return 0 for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) { const valuesText: string = videoStream[key] @@ -55,24 +174,26 @@ async function getVideoFileFPS (path: string) { return 0 } -async function getVideoFileBitrate (path: string) { - return new Promise((res, rej) => { +async function getMetadataFromFile (path: string, cb = metadata => metadata) { + return new Promise((res, rej) => { ffmpeg.ffprobe(path, (err, metadata) => { if (err) return rej(err) - return res(metadata.format.bit_rate) + return res(cb(new VideoFileMetadata(metadata))) }) }) } +async function getVideoFileBitrate (path: string) { + return getMetadataFromFile(path, metadata => metadata.format.bit_rate) +} + function getDurationFromVideoFile (path: string) { - return new Promise((res, rej) => { - ffmpeg.ffprobe(path, (err, metadata) => { - if (err) return rej(err) + return getMetadataFromFile(path, metadata => Math.floor(metadata.format.duration)) +} - return res(Math.floor(metadata.format.duration)) - }) - }) +function getVideoStreamFromFile (path: string) { + return getMetadataFromFile(path, metadata => metadata.streams.find(s => s.codec_type === 'video') || null) } async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) { @@ -95,7 +216,7 @@ async function generateImageFromVideoFile (fromPath: string, folder: string, ima }) const destination = join(folder, imageName) - await processImage({ path: pendingImagePath }, destination, size) + await processImage(pendingImagePath, destination, size) } catch (err) { logger.error('Cannot generate image from video %s.', fromPath, { err }) @@ -107,47 +228,64 @@ async function generateImageFromVideoFile (fromPath: string, folder: string, ima } } -type TranscodeOptions = { +type TranscodeOptionsType = 'hls' | 'quick-transcode' | 'video' | 'merge-audio' | 'only-audio' + +interface BaseTranscodeOptions { + type: TranscodeOptionsType inputPath: string outputPath: string - resolution?: VideoResolution + resolution: VideoResolution isPortraitMode?: boolean } -function transcode (options: TranscodeOptions) { - return new Promise(async (res, rej) => { - try { - let fps = await getVideoFileFPS(options.inputPath) - // On small/medium resolutions, limit FPS - if ( - options.resolution !== undefined && - options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN && - fps > VIDEO_TRANSCODING_FPS.AVERAGE - ) { - fps = VIDEO_TRANSCODING_FPS.AVERAGE - } +interface HLSTranscodeOptions extends BaseTranscodeOptions { + type: 'hls' + copyCodecs: boolean + hlsPlaylist: { + videoFilename: string + } +} - let command = ffmpeg(options.inputPath, { niceness: FFMPEG_NICE.TRANSCODING }) - .output(options.outputPath) - command = await presetH264(command, options.resolution, fps) +interface QuickTranscodeOptions extends BaseTranscodeOptions { + type: 'quick-transcode' +} - if (CONFIG.TRANSCODING.THREADS > 0) { - // if we don't set any threads ffmpeg will chose automatically - command = command.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS) - } +interface VideoTranscodeOptions extends BaseTranscodeOptions { + type: 'video' +} - if (options.resolution !== undefined) { - // '?x720' or '720x?' for example - const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}` - command = command.size(size) - } +interface MergeAudioTranscodeOptions extends BaseTranscodeOptions { + type: 'merge-audio' + audioPath: string +} - if (fps) { - // Hard FPS limits - if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = VIDEO_TRANSCODING_FPS.MAX - else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN +interface OnlyAudioTranscodeOptions extends BaseTranscodeOptions { + type: 'only-audio' +} + +type TranscodeOptions = + HLSTranscodeOptions + | VideoTranscodeOptions + | MergeAudioTranscodeOptions + | OnlyAudioTranscodeOptions + | QuickTranscodeOptions + +function transcode (options: TranscodeOptions) { + return new Promise(async (res, rej) => { + try { + let command = getFFmpeg(options.inputPath) + .output(options.outputPath) - command = command.withFPS(fps) + if (options.type === 'quick-transcode') { + command = buildQuickTranscodeCommand(command) + } else if (options.type === 'hls') { + command = await buildHLSVODCommand(command, options) + } else if (options.type === 'merge-audio') { + command = await buildAudioMergeCommand(command, options) + } else if (options.type === 'only-audio') { + command = buildOnlyAudioCommand(command, options) + } else { + command = await buildx264Command(command, options) } command @@ -155,7 +293,11 @@ function transcode (options: TranscodeOptions) { logger.error('Error in transcoding job.', { stdout, stderr }) return rej(err) }) - .on('end', res) + .on('end', () => { + return fixHLSPlaylistIfNeeded(options) + .then(() => res()) + .catch(err => rej(err)) + }) .run() } catch (err) { return rej(err) @@ -163,138 +305,286 @@ function transcode (options: TranscodeOptions) { }) } +async function canDoQuickTranscode (path: string): Promise { + // NOTE: This could be optimized by running ffprobe only once (but it runs fast anyway) + const videoStream = await getVideoStreamFromFile(path) + const parsedAudio = await audio.get(path) + const fps = await getVideoFileFPS(path) + const bitRate = await getVideoFileBitrate(path) + const resolution = await getVideoFileResolution(path) + + // check video params + if (videoStream == null) 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 + + 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] +} + +function convertWebPToJPG (path: string, destination: string): Promise { + return new Promise(async (res, rej) => { + try { + const command = ffmpeg(path).output(destination) + + command.on('error', (err, stdout, stderr) => { + logger.error('Error in ffmpeg webp convert process.', { stdout, stderr }) + return rej(err) + }) + .on('end', () => res()) + .run() + } catch (err) { + return rej(err) + } + }) +} + +function runLiveTranscoding (rtmpUrl: string, outPath: string, resolutions: number[]) { + const command = getFFmpeg(rtmpUrl) + command.inputOption('-fflags nobuffer') + + const varStreamMap: string[] = [] + + command.complexFilter([ + { + inputs: '[v:0]', + filter: 'split', + options: resolutions.length, + outputs: resolutions.map(r => `vtemp${r}`) + }, + + ...resolutions.map(r => ({ + inputs: `vtemp${r}`, + filter: 'scale', + options: `w=-2:h=${r}`, + outputs: `vout${r}` + })) + ]) + + const liveFPS = VIDEO_TRANSCODING_FPS.AVERAGE + + command.withFps(liveFPS) + + command.outputOption('-b_strategy 1') + command.outputOption('-bf 16') + command.outputOption('-preset superfast') + command.outputOption('-level 3.1') + command.outputOption('-map_metadata -1') + command.outputOption('-pix_fmt yuv420p') + + for (let i = 0; i < resolutions.length; i++) { + const resolution = resolutions[i] + + command.outputOption(`-map [vout${resolution}]`) + command.outputOption(`-c:v:${i} libx264`) + command.outputOption(`-b:v:${i} ${getTargetBitrate(resolution, liveFPS, VIDEO_TRANSCODING_FPS)}`) + + command.outputOption(`-map a:0`) + command.outputOption(`-c:a:${i} aac`) + + varStreamMap.push(`v:${i},a:${i}`) + } + + addDefaultLiveHLSParams(command, outPath) + + command.outputOption('-var_stream_map', varStreamMap.join(' ')) + + command.run() + + return command +} + +function runLiveMuxing (rtmpUrl: string, outPath: string) { + const command = getFFmpeg(rtmpUrl) + command.inputOption('-fflags nobuffer') + + command.outputOption('-c:v copy') + command.outputOption('-c:a copy') + command.outputOption('-map 0:a?') + command.outputOption('-map 0:v?') + + addDefaultLiveHLSParams(command, outPath) + + command.run() + + return command +} + // --------------------------------------------------------------------------- export { + getVideoStreamCodec, + getAudioStreamCodec, + runLiveMuxing, + convertWebPToJPG, + getVideoStreamSize, getVideoFileResolution, + getMetadataFromFile, getDurationFromVideoFile, + runLiveTranscoding, generateImageFromVideoFile, + TranscodeOptions, + TranscodeOptionsType, transcode, getVideoFileFPS, computeResolutionsToTranscode, audio, - getVideoFileBitrate + getVideoFileBitrate, + canDoQuickTranscode } // --------------------------------------------------------------------------- -function getVideoFileStream (path: string) { - return new Promise((res, rej) => { - ffmpeg.ffprobe(path, (err, metadata) => { - if (err) return rej(err) +function addDefaultX264Params (command: ffmpeg.FfmpegCommand) { + command.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 +} - const videoStream = metadata.streams.find(s => s.codec_type === 'video') - if (!videoStream) return rej(new Error('Cannot find video stream of ' + path)) +function addDefaultLiveHLSParams (command: ffmpeg.FfmpegCommand, outPath: string) { + command.outputOption('-hls_time 4') + command.outputOption('-hls_list_size 15') + command.outputOption('-hls_flags delete_segments') + command.outputOption(`-hls_segment_filename ${join(outPath, '%v-%d.ts')}`) + command.outputOption('-master_pl_name master.m3u8') + command.outputOption(`-f hls`) - return res(videoStream) - }) - }) + command.output(join(outPath, '%v.m3u8')) } -/** - * A slightly customised version of the 'veryfast' x264 preset - * - * The veryfast preset is right in the sweet spot of performance - * and quality. Superfast and ultrafast will give you better - * performance, but then quality is noticeably worse. - */ -async function presetH264VeryFast (command: ffmpeg.FfmpegCommand, resolution: VideoResolution, fps: number): Promise { - let localCommand = await presetH264(command, resolution, fps) - localCommand = localCommand.outputOption('-preset:v veryfast') - .outputOption([ '--aq-mode=2', '--aq-strength=1.3' ]) - /* - MAIN reference: https://slhck.info/video/2017/03/01/rate-control.html - Our target situation is closer to a livestream than a stream, - since we want to reduce as much a possible the encoding burden, - altough not to the point of a livestream where there is a hard - constraint on the frames per second to be encoded. +async function buildx264Command (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) { + let fps = await getVideoFileFPS(options.inputPath) + 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 + ) { + // Get closest standard framerate by modulo: downsampling has to be done to a divisor of the nominal fps value + fps = getClosestFramerateStandard(fps, 'STANDARD') + } - why '--aq-mode=2 --aq-strength=1.3' instead of '-profile:v main'? - Make up for most of the loss of grain and macroblocking - with less computing power. - */ + command = await presetH264(command, options.inputPath, options.resolution, fps) - return localCommand + if (options.resolution !== undefined) { + // '?x720' or '720x?' for example + const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}` + command = command.size(size) + } + + if (fps) { + // Hard FPS limits + 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) + } + + return command } -/** - * A preset optimised for a stillimage audio video - */ -async function presetStillImageWithAudio ( - command: ffmpeg.FfmpegCommand, - resolution: VideoResolution, - fps: number -): Promise { - let localCommand = await presetH264VeryFast(command, resolution, fps) - localCommand = localCommand.outputOption('-tune stillimage') +async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: MergeAudioTranscodeOptions) { + command = command.loop(undefined) - return localCommand + command = await presetH264VeryFast(command, options.audioPath, options.resolution) + + command = command.input(options.audioPath) + .videoFilter('scale=trunc(iw/2)*2:trunc(ih/2)*2') // Avoid "height not divisible by 2" error + .outputOption('-tune stillimage') + .outputOption('-shortest') + + return command } -/** - * A toolbox to play with audio - */ -namespace audio { - export const get = (option: ffmpeg.FfmpegCommand | 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 buildOnlyAudioCommand (command: ffmpeg.FfmpegCommand, options: OnlyAudioTranscodeOptions) { + command = presetOnlyAudio(command) - function parseFfprobe (err: any, data: ffmpeg.FfprobeData) { - if (err) return rej(err) + return command +} - if ('streams' in data) { - const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio') - if (audioStream) { - return res({ - absolutePath: data.format.filename, - audioStream - }) - } - } +function buildQuickTranscodeCommand (command: ffmpeg.FfmpegCommand) { + command = presetCopy(command) - return res({ absolutePath: data.format.filename }) - } + command = command.outputOption('-map_metadata -1') // strip all metadata + .outputOption('-movflags faststart') - if (typeof option === 'string') { - return ffmpeg.ffprobe(option, parseFfprobe) - } + return command +} - return option.ffprobe(parseFfprobe) - }) - } +async function buildHLSVODCommand (command: ffmpeg.FfmpegCommand, options: HLSTranscodeOptions) { + const videoPath = getHLSVideoPath(options) - export namespace bitrate { - const baseKbitrate = 384 + if (options.copyCodecs) command = presetCopy(command) + else if (options.resolution === VideoResolution.H_NOVIDEO) command = presetOnlyAudio(command) + else command = await buildx264Command(command, options) - const toBits = (kbits: number): number => { return kbits * 8000 } + command = command.outputOption('-hls_time 4') + .outputOption('-hls_list_size 0') + .outputOption('-hls_playlist_type vod') + .outputOption('-hls_segment_filename ' + videoPath) + .outputOption('-hls_segment_type fmp4') + .outputOption('-f hls') + .outputOption('-hls_flags single_file') - 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 - } - } + return command +} - 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 getHLSVideoPath (options: HLSTranscodeOptions) { + return `${dirname(options.outputPath)}/${options.hlsPlaylist.videoFilename}` +} + +async function fixHLSPlaylistIfNeeded (options: TranscodeOptions) { + if (options.type !== 'hls') return + + const fileContent = await readFile(options.outputPath) + + const videoFileName = options.hlsPlaylist.videoFilename + const videoFilePath = getHLSVideoPath(options) + + // Fix wrong mapping with some ffmpeg versions + const newContent = fileContent.toString() + .replace(`#EXT-X-MAP:URI="${videoFilePath}",`, `#EXT-X-MAP:URI="${videoFileName}",`) + + await writeFile(options.outputPath, newContent) +} + +/** + * A slightly customised version of the 'veryfast' x264 preset + * + * The veryfast preset is right in the sweet spot of performance + * and quality. Superfast and ultrafast will give you better + * performance, but then quality is noticeably worse. + */ +async function presetH264VeryFast (command: ffmpeg.FfmpegCommand, input: string, resolution: VideoResolution, fps?: number) { + let localCommand = await presetH264(command, input, resolution, fps) + + localCommand = localCommand.outputOption('-preset:v veryfast') + + /* + MAIN reference: https://slhck.info/video/2017/03/01/rate-control.html + Our target situation is closer to a livestream than a stream, + since we want to reduce as much a possible the encoding burden, + although not to the point of a livestream where there is a hard + constraint on the frames per second to be encoded. + */ + + return localCommand } /** @@ -303,18 +593,15 @@ namespace audio { * As for the audio, quality '5' is the highest and ensures 96-112kbps/channel * See https://trac.ffmpeg.org/wiki/Encode/AAC#fdk_vbr */ -async function presetH264 (command: ffmpeg.FfmpegCommand, resolution: VideoResolution, fps: number): Promise { +async function presetH264 (command: ffmpeg.FfmpegCommand, input: string, resolution: VideoResolution, fps?: number) { 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('-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 .outputOption('-movflags faststart') - const parsedAudio = await audio.get(localCommand) + addDefaultX264Params(localCommand) + + const parsedAudio = await audio.get(input) if (!parsedAudio.audioStream) { localCommand = localCommand.noAudio() @@ -323,28 +610,56 @@ async function presetH264 (command: ffmpeg.FfmpegCommand, resolution: VideoResol .audioCodec('libfdk_aac') .audioQuality(5) } else { - // we try to reduce the ceiling bitrate by making rough correspondances of bitrates + // we try to reduce the ceiling bitrate by making rough matches of bitrates // of course this is far from perfect, but it might save some space in the end - const audioCodecName = parsedAudio.audioStream[ 'codec_name' ] - let bitrate: number - if (audio.bitrate[ audioCodecName ]) { - localCommand = localCommand.audioCodec('aac') + localCommand = localCommand.audioCodec('aac') - bitrate = audio.bitrate[ audioCodecName ](parsedAudio.audioStream[ 'bit_rate' ]) + const audioCodecName = parsedAudio.audioStream['codec_name'] + + if (audio.bitrate[audioCodecName]) { + const bitrate = audio.bitrate[audioCodecName](parsedAudio.audioStream['bit_rate']) if (bitrate !== undefined && bitrate !== -1) localCommand = localCommand.audioBitrate(bitrate) } } - // Constrained Encoding (VBV) - // https://slhck.info/video/2017/03/01/rate-control.html - // https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate - const targetBitrate = getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS) - localCommand = localCommand.outputOptions([`-maxrate ${ targetBitrate }`, `-bufsize ${ targetBitrate * 2 }`]) - - // Keyframe interval of 2 seconds for faster seeking and resolution switching. - // https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html - // https://superuser.com/a/908325 - localCommand = localCommand.outputOption(`-g ${ fps * 2 }`) + if (fps) { + // Constrained Encoding (VBV) + // https://slhck.info/video/2017/03/01/rate-control.html + // https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate + const targetBitrate = getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS) + localCommand = localCommand.outputOptions([ `-maxrate ${targetBitrate}`, `-bufsize ${targetBitrate * 2}` ]) + + // Keyframe interval of 2 seconds for faster seeking and resolution switching. + // https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html + // https://superuser.com/a/908325 + localCommand = localCommand.outputOption(`-g ${fps * 2}`) + } return localCommand } + +function presetCopy (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand { + return command + .format('mp4') + .videoCodec('copy') + .audioCodec('copy') +} + +function presetOnlyAudio (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand { + return command + .format('mp4') + .audioCodec('copy') + .noVideo() +} + +function getFFmpeg (input: string) { + // We set cwd explicitly because ffmpeg appears to create temporary files when trancoding which fails in read-only file systems + const command = ffmpeg(input, { niceness: FFMPEG_NICE.TRANSCODING, cwd: CONFIG.STORAGE.TMP_DIR }) + + if (CONFIG.TRANSCODING.THREADS > 0) { + // If we don't set any threads ffmpeg will chose automatically + command.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS) + } + + return command +}