X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=server%2Fhelpers%2Fffmpeg-utils.ts;h=d818c459c66d5752d0da68fbb1d7709cdcca0da2;hb=4ee7a4c9ac9280cda930a281c2d5a9a4c409cc14;hp=c35125ec1cedc1a784c6f7ed84c1c1c3391d0ad7;hpb=14d3270f363245d2c83fcc2ac109e39743b5627e;p=oweals%2Fpeertube.git diff --git a/server/helpers/ffmpeg-utils.ts b/server/helpers/ffmpeg-utils.ts index c35125ec1..d818c459c 100644 --- a/server/helpers/ffmpeg-utils.ts +++ b/server/helpers/ffmpeg-utils.ts @@ -1,16 +1,76 @@ -import * as Promise from 'bluebird' import * as ffmpeg from 'fluent-ffmpeg' +import { dirname, join } from 'path' +import { getTargetBitrate, VideoResolution } from '../../shared/models/videos' +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 { readFile, remove, writeFile } from 'fs-extra' +import { CONFIG } from '../initializers/config' -import { CONFIG } from '../initializers' -import { VideoResolution } from '../../shared/models/videos/video-resolution.enum' +function computeResolutionsToTranscode (videoFileHeight: number) { + const resolutionsEnabled: number[] = [] + const configResolutions = CONFIG.TRANSCODING.RESOLUTIONS -function getVideoFileHeight (path: string) { + // Put in the order we want to proceed jobs + const resolutions = [ + VideoResolution.H_480P, + VideoResolution.H_360P, + VideoResolution.H_720P, + VideoResolution.H_240P, + VideoResolution.H_1080P + ] + + for (const resolution of resolutions) { + if (configResolutions[ resolution + 'p' ] === true && videoFileHeight > resolution) { + resolutionsEnabled.push(resolution) + } + } + + return resolutionsEnabled +} + +async function getVideoFileSize (path: string) { + const videoStream = await getVideoFileStream(path) + + return { + width: videoStream.width, + height: videoStream.height + } +} + +async function getVideoFileResolution (path: string) { + const size = await getVideoFileSize(path) + + return { + videoFileResolution: Math.min(size.height, size.width), + isPortraitMode: size.height > size.width + } +} + +async function getVideoFileFPS (path: string) { + const videoStream = await getVideoFileStream(path) + + for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) { + const valuesText: string = videoStream[key] + if (!valuesText) continue + + const [ frames, seconds ] = valuesText.split('/') + if (!frames || !seconds) continue + + const result = parseInt(frames, 10) / parseInt(seconds, 10) + if (result > 0) return Math.round(result) + } + + return 0 +} + +async function getVideoFileBitrate (path: string) { return new Promise((res, rej) => { ffmpeg.ffprobe(path, (err, metadata) => { if (err) return rej(err) - const videoStream = metadata.streams.find(s => s.codec_type === 'video') - return res(videoStream.height) + return res(metadata.format.bit_rate) }) }) } @@ -25,55 +85,338 @@ function getDurationFromVideoFile (path: string) { }) } -function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size?: string) { +async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) { + const pendingImageName = 'pending-' + imageName + const options = { - filename: imageName, + filename: pendingImageName, count: 1, folder } - if (size !== undefined) { - options['size'] = size - } + const pendingImagePath = join(folder, pendingImageName) - return new Promise((res, rej) => { - ffmpeg(fromPath) - .on('error', rej) - .on('end', () => res(imageName)) - .thumbnail(options) - }) + try { + await new Promise((res, rej) => { + ffmpeg(fromPath, { niceness: FFMPEG_NICE.THUMBNAIL }) + .on('error', rej) + .on('end', () => res(imageName)) + .thumbnail(options) + }) + + const destination = join(folder, imageName) + await processImage({ path: pendingImagePath }, destination, size) + } catch (err) { + logger.error('Cannot generate image from video %s.', fromPath, { err }) + + try { + await remove(pendingImagePath) + } catch (err) { + logger.debug('Cannot remove pending image path after generation error.', { err }) + } + } } type TranscodeOptions = { inputPath: string outputPath: string - resolution?: VideoResolution + resolution: VideoResolution + isPortraitMode?: boolean + + hlsPlaylist?: { + videoFilename: string + } } function transcode (options: TranscodeOptions) { - return new Promise((res, rej) => { - let command = ffmpeg(options.inputPath) - .output(options.outputPath) - .videoCodec('libx264') - .outputOption('-threads ' + CONFIG.TRANSCODING.THREADS) - .outputOption('-movflags faststart') - - if (options.resolution !== undefined) { - const size = `${options.resolution}x?` // '720x?' for example - command = command.size(size) - } + return new Promise(async (res, rej) => { + try { + let command = ffmpeg(options.inputPath, { niceness: FFMPEG_NICE.TRANSCODING }) + .output(options.outputPath) + + if (options.hlsPlaylist) { + command = await buildHLSCommand(command, options) + } else { + command = await buildx264Command(command, options) + } - command.on('error', rej) - .on('end', res) - .run() + if (CONFIG.TRANSCODING.THREADS > 0) { + // if we don't set any threads ffmpeg will chose automatically + command = command.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS) + } + + command + .on('error', (err, stdout, stderr) => { + logger.error('Error in transcoding job.', { stdout, stderr }) + return rej(err) + }) + .on('end', () => { + return onTranscodingSuccess(options) + .then(() => res()) + .catch(err => rej(err)) + }) + .run() + } catch (err) { + return rej(err) + } }) } // --------------------------------------------------------------------------- export { - getVideoFileHeight, + getVideoFileSize, + getVideoFileResolution, getDurationFromVideoFile, generateImageFromVideoFile, - transcode + transcode, + getVideoFileFPS, + computeResolutionsToTranscode, + audio, + getVideoFileBitrate +} + +// --------------------------------------------------------------------------- + +async function buildx264Command (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) { + let fps = await getVideoFileFPS(options.inputPath) + // On small/medium resolutions, limit FPS + if ( + options.resolution !== undefined && + options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN && + fps > VIDEO_TRANSCODING_FPS.AVERAGE + ) { + fps = VIDEO_TRANSCODING_FPS.AVERAGE + } + + command = await presetH264(command, options.resolution, fps) + + if (options.resolution !== undefined) { + // '?x720' or '720x?' for example + const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}` + command = command.size(size) + } + + if (fps) { + // Hard FPS limits + if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = VIDEO_TRANSCODING_FPS.MAX + else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN + + command = command.withFPS(fps) + } + + return command +} + +async function buildHLSCommand (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) { + const videoPath = getHLSVideoPath(options) + + command = await presetCopy(command) + + command = command.outputOption('-hls_time 4') + .outputOption('-hls_list_size 0') + .outputOption('-hls_playlist_type vod') + .outputOption('-hls_segment_filename ' + videoPath) + .outputOption('-hls_segment_type fmp4') + .outputOption('-f hls') + .outputOption('-hls_flags single_file') + + return command +} + +function getHLSVideoPath (options: TranscodeOptions) { + return `${dirname(options.outputPath)}/${options.hlsPlaylist.videoFilename}` +} + +async function onTranscodingSuccess (options: TranscodeOptions) { + if (!options.hlsPlaylist) return + + // Fix wrong mapping with some ffmpeg versions + const fileContent = await readFile(options.outputPath) + + const videoFileName = options.hlsPlaylist.videoFilename + const videoFilePath = getHLSVideoPath(options) + + const newContent = fileContent.toString() + .replace(`#EXT-X-MAP:URI="${videoFilePath}",`, `#EXT-X-MAP:URI="${videoFileName}",`) + + await writeFile(options.outputPath, newContent) +} + +function getVideoFileStream (path: string) { + return new Promise((res, rej) => { + ffmpeg.ffprobe(path, (err, metadata) => { + if (err) return rej(err) + + const videoStream = metadata.streams.find(s => s.codec_type === 'video') + if (!videoStream) return rej(new Error('Cannot find video stream of ' + path)) + + return res(videoStream) + }) + }) +} + +/** + * 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. + + 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. + */ + + return localCommand +} + +/** + * 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') + + return localCommand +} + +/** + * 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 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 }) + } + + if (typeof option === 'string') { + return ffmpeg.ffprobe(option, parseFfprobe) + } + + return option.ffprobe(parseFfprobe) + }) + } + + export namespace bitrate { + const baseKbitrate = 384 + + const toBits = (kbits: number): number => { return 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. + * + * 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 { + 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) + + if (!parsedAudio.audioStream) { + localCommand = localCommand.noAudio() + } else if ((await checkFFmpegEncoders()).get('libfdk_aac')) { // we favor VBR, if a good AAC encoder is available + localCommand = localCommand + .audioCodec('libfdk_aac') + .audioQuality(5) + } else { + // we try to reduce the ceiling bitrate by making rough correspondances 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') + + 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 }`) + + return localCommand +} + +async function presetCopy (command: ffmpeg.FfmpegCommand): Promise { + return command + .format('mp4') + .videoCodec('copy') + .audioCodec('copy') }