import * as ffmpeg from 'fluent-ffmpeg'
+import { dirname, join } from 'path'
+import { getTargetBitrate, getMaxBitrate, 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_NOVIDEO,
+ VideoResolution.H_480P,
+ VideoResolution.H_360P,
+ VideoResolution.H_720P,
+ VideoResolution.H_240P,
+ VideoResolution.H_1080P,
+ VideoResolution.H_4K
+ ]
+
+ for (const resolution of resolutions) {
+ if (configResolutions[ resolution + 'p' ] === true && videoFileHeight > resolution) {
+ resolutionsEnabled.push(resolution)
+ }
+ }
+
+ 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
+ }
+
+ 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 getVideoStreamSize(path)
+
+ return {
+ videoFileResolution: Math.min(size.height, size.width),
+ isPortraitMode: size.height > size.width
+ }
+}
+
+async function getVideoFileFPS (path: string) {
+ 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 ]
+ 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<number>((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)
})
})
}
})
}
-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<string>((res, rej) => {
- ffmpeg(fromPath)
- .on('error', rej)
- .on('end', () => res(imageName))
- .thumbnail(options)
- })
+ try {
+ await new Promise<string>((res, rej) => {
+ ffmpeg(fromPath, { niceness: FFMPEG_NICE.THUMBNAIL })
+ .on('error', rej)
+ .on('end', () => res(imageName))
+ .thumbnail(options)
+ })
+
+ const destination = join(folder, imageName)
+ await processImage(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 = {
+type TranscodeOptionsType = 'hls' | 'quick-transcode' | 'video' | 'merge-audio' | 'only-audio'
+
+interface BaseTranscodeOptions {
+ type: TranscodeOptionsType
inputPath: string
outputPath: string
- resolution?: VideoResolution
+ resolution: VideoResolution
+ isPortraitMode?: boolean
+}
+
+interface HLSTranscodeOptions extends BaseTranscodeOptions {
+ type: 'hls'
+ copyCodecs: boolean
+ hlsPlaylist: {
+ videoFilename: string
+ }
}
+interface QuickTranscodeOptions extends BaseTranscodeOptions {
+ type: 'quick-transcode'
+}
+
+interface VideoTranscodeOptions extends BaseTranscodeOptions {
+ type: 'video'
+}
+
+interface MergeAudioTranscodeOptions extends BaseTranscodeOptions {
+ type: 'merge-audio'
+ audioPath: string
+}
+
+interface OnlyAudioTranscodeOptions extends BaseTranscodeOptions {
+ type: 'only-audio'
+}
+
+type TranscodeOptions = HLSTranscodeOptions
+ | VideoTranscodeOptions
+ | MergeAudioTranscodeOptions
+ | OnlyAudioTranscodeOptions
+ | QuickTranscodeOptions
+
function transcode (options: TranscodeOptions) {
- return new Promise<void>((res, rej) => {
- let command = ffmpeg(options.inputPath)
- .output(options.outputPath)
- .videoCodec('libx264')
- .outputOption('-threads ' + CONFIG.TRANSCODING.THREADS)
- .outputOption('-movflags faststart')
- // .outputOption('-crf 18')
-
- if (options.resolution !== undefined) {
- const size = `?x${options.resolution}` // '?x720' for example
- command = command.size(size)
- }
+ return new Promise<void>(async (res, rej) => {
+ try {
+ let command = ffmpeg(options.inputPath, { niceness: FFMPEG_NICE.TRANSCODING })
+ .output(options.outputPath)
+
+ if (options.type === 'quick-transcode') {
+ command = await 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)
+ } else {
+ command = await buildx264Command(command, options)
+ }
+
+ 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', rej)
- .on('end', res)
- .run()
+ command
+ .on('error', (err, stdout, stderr) => {
+ logger.error('Error in transcoding job.', { stdout, stderr })
+ return rej(err)
+ })
+ .on('end', () => {
+ return fixHLSPlaylistIfNeeded(options)
+ .then(() => res())
+ .catch(err => rej(err))
+ })
+ .run()
+ } catch (err) {
+ return rej(err)
+ }
})
}
+async function canDoQuickTranscode (path: string): Promise<boolean> {
+ // 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
+}
+
// ---------------------------------------------------------------------------
export {
- getVideoFileHeight,
+ getVideoStreamCodec,
+ getAudioStreamCodec,
+ getVideoStreamSize,
+ getVideoFileResolution,
getDurationFromVideoFile,
generateImageFromVideoFile,
- transcode
+ TranscodeOptions,
+ TranscodeOptionsType,
+ transcode,
+ getVideoFileFPS,
+ computeResolutionsToTranscode,
+ audio,
+ getVideoFileBitrate,
+ canDoQuickTranscode
+}
+
+// ---------------------------------------------------------------------------
+
+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 ||
+ // If the video is doesn't match had standard
+ !VIDEO_TRANSCODING_FPS.HD_STANDARD.map(value => fps % value).includes(0)
+ ) {
+ // Get closest standard framerate by modulo: downsampling has to be done to a divisor of the nominal fps value
+ fps = VIDEO_TRANSCODING_FPS.STANDARD.sort((a, b) => fps % a - fps % b)[0]
+ }
+
+ command = await presetH264(command, options.inputPath, 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.HD_STANDARD.sort((a, b) => fps % a - fps % b)[0]
+ else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN
+
+ command = command.withFPS(fps)
+ }
+
+ return command
+}
+
+async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: MergeAudioTranscodeOptions) {
+ command = command.loop(undefined)
+
+ 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
+}
+
+async function buildOnlyAudioCommand (command: ffmpeg.FfmpegCommand, options: OnlyAudioTranscodeOptions) {
+ command = await presetOnlyAudio(command)
+
+ return command
+}
+
+async function buildQuickTranscodeCommand (command: ffmpeg.FfmpegCommand) {
+ command = await presetCopy(command)
+
+ command = command.outputOption('-map_metadata -1') // strip all metadata
+ .outputOption('-movflags faststart')
+
+ return command
+}
+
+async function buildHLSCommand (command: ffmpeg.FfmpegCommand, options: HLSTranscodeOptions) {
+ const videoPath = getHLSVideoPath(options)
+
+ if (options.copyCodecs) command = await presetCopy(command)
+ else command = await buildx264Command(command, options)
+
+ 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: 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)
+}
+
+function getVideoStreamFromFile (path: string) {
+ return new Promise<any>((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 || null)
+ })
+ })
+}
+
+/**
+ * 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
+}
+
+/**
+ * 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.
+ *
+ * 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, input: string, resolution: VideoResolution, fps?: number) {
+ let localCommand = command
+ .format('mp4')
+ .videoCodec('libx264')
+ .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
+ .outputOption('-movflags faststart')
+
+ const parsedAudio = await audio.get(input)
+
+ 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 matches of bitrates
+ // 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' ]
+
+ if (audio.bitrate[ audioCodecName ]) {
+ const bitrate = audio.bitrate[ audioCodecName ](parsedAudio.audioStream[ 'bit_rate' ])
+ if (bitrate !== undefined && bitrate !== -1) localCommand = localCommand.audioBitrate(bitrate)
+ }
+ }
+
+ 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
+}
+
+async function presetCopy (command: ffmpeg.FfmpegCommand): Promise<ffmpeg.FfmpegCommand> {
+ return command
+ .format('mp4')
+ .videoCodec('copy')
+ .audioCodec('copy')
+}
+
+async function presetOnlyAudio (command: ffmpeg.FfmpegCommand): Promise<ffmpeg.FfmpegCommand> {
+ return command
+ .format('mp4')
+ .audioCodec('copy')
+ .noVideo()
}
projects / github / Chocobozzz / PeerTube.git / blobdiff