import * as ffmpeg from 'fluent-ffmpeg'
-import { join } from 'path'
-import { VideoResolution } from '../../shared/models/videos'
-import { CONFIG, VIDEO_TRANSCODING_FPS } from '../initializers'
-import { unlinkPromise } from './core-utils'
+import { outputFile, 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_LIVE, VIDEO_TRANSCODING_FPS } from '../initializers/constants'
import { processImage } from './image-utils'
import { logger } from './logger'
+/**
+ * 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[] = []
+
+ // 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 && videoFileResolution > 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
+ }
+
+ 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 [ 'r_frame_rate' , 'avg_frame_rate' ]) {
+ for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) {
const valuesText: string = videoStream[key]
if (!valuesText) continue
if (!frames || !seconds) continue
const result = parseInt(frames, 10) / parseInt(seconds, 10)
- if (result > 0) return result
+ if (result > 0) return Math.round(result)
}
return 0
}
-function getDurationFromVideoFile (path: string) {
- return new Promise<number>((res, rej) => {
+async function getMetadataFromFile <T> (path: string, cb = metadata => metadata) {
+ return new Promise<T>((res, rej) => {
ffmpeg.ffprobe(path, (err, metadata) => {
if (err) return rej(err)
- return res(Math.floor(metadata.format.duration))
+ return res(cb(new VideoFileMetadata(metadata)))
})
})
}
+async function getVideoFileBitrate (path: string) {
+ return getMetadataFromFile<number>(path, metadata => metadata.format.bit_rate)
+}
+
+function getDurationFromVideoFile (path: string) {
+ return getMetadataFromFile<number>(path, metadata => Math.floor(metadata.format.duration))
+}
+
+function getVideoStreamFromFile (path: string) {
+ return getMetadataFromFile<any>(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 }) {
const pendingImageName = 'pending-' + imageName
try {
await new Promise<string>((res, rej) => {
- ffmpeg(fromPath)
+ 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)
+ await processImage(pendingImagePath, destination, size)
} catch (err) {
- logger.error('Cannot generate image from video %s.', fromPath, err)
+ logger.error('Cannot generate image from video %s.', fromPath, { err })
try {
- await unlinkPromise(pendingImagePath)
+ await remove(pendingImagePath)
} catch (err) {
- logger.debug('Cannot remove pending image path after generation error.', 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>(async (res, rej) => {
- const fps = await getVideoFileFPS(options.inputPath)
-
- let command = ffmpeg(options.inputPath)
- .output(options.outputPath)
- .videoCodec('libx264')
- .outputOption('-threads ' + CONFIG.TRANSCODING.THREADS)
- .outputOption('-movflags faststart')
- // .outputOption('-crf 18')
-
- // Our player has some FPS limits
- if (fps > VIDEO_TRANSCODING_FPS.MAX) command = command.withFPS(VIDEO_TRANSCODING_FPS.MAX)
- else if (fps < VIDEO_TRANSCODING_FPS.MIN) command = command.withFPS(VIDEO_TRANSCODING_FPS.MIN)
-
- if (options.resolution !== undefined) {
- // '?x720' or '720x?' for example
- const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}`
- command = command.size(size)
+ try {
+ let command = getFFmpeg(options.inputPath)
+ .output(options.outputPath)
+
+ 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
+ .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
- command
- .on('error', (err, stdout, stderr) => {
- logger.error('Error in transcoding job.', { stdout, stderr })
+ // 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<void> {
+ return new Promise<void>(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)
+ .on('end', () => res())
.run()
+ } catch (err) {
+ return rej(err)
+ }
+ })
+}
+
+function runLiveTranscoding (rtmpUrl: string, outPath: string, resolutions: number[], fps, deleteSegments: boolean) {
+ 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}`
+ }))
+ ])
+
+ 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')
+ command.outputOption('-max_muxing_queue_size 1024')
+ command.outputOption('-g ' + (fps * 2))
+
+ 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} ${getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS)}`)
+
+ command.outputOption(`-map a:0`)
+ command.outputOption(`-c:a:${i} aac`)
+
+ varStreamMap.push(`v:${i},a:${i}`)
+ }
+
+ addDefaultLiveHLSParams(command, outPath, deleteSegments)
+
+ command.outputOption('-var_stream_map', varStreamMap.join(' '))
+
+ command.run()
+
+ return command
+}
+
+function runLiveMuxing (rtmpUrl: string, outPath: string, deleteSegments: boolean) {
+ 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, deleteSegments)
+
+ command.run()
+
+ return command
+}
+
+async function hlsPlaylistToFragmentedMP4 (hlsDirectory: string, segmentFiles: string[], outputPath: string) {
+ const concatFilePath = join(hlsDirectory, 'concat.txt')
+
+ function cleaner () {
+ remove(concatFilePath)
+ .catch(err => logger.error('Cannot remove concat file in %s.', hlsDirectory, { err }))
+ }
+
+ // First concat the ts files to a mp4 file
+ const content = segmentFiles.map(f => 'file ' + f)
+ .join('\n')
+
+ await writeFile(concatFilePath, content + '\n')
+
+ const command = getFFmpeg(concatFilePath)
+ command.inputOption('-safe 0')
+ command.inputOption('-f concat')
+
+ command.outputOption('-c:v copy')
+ command.audioFilter('aresample=async=1:first_pts=0')
+ command.output(outputPath)
+
+ return runCommand(command, cleaner)
+}
+
+async function runCommand (command: ffmpeg.FfmpegCommand, onEnd?: Function) {
+ command.run()
+
+ return new Promise<string>((res, rej) => {
+ command.on('error', err => {
+ if (onEnd) onEnd()
+
+ rej(err)
+ })
+
+ command.on('end', () => {
+ if (onEnd) onEnd()
+
+ res()
+ })
})
}
// ---------------------------------------------------------------------------
export {
+ getVideoStreamCodec,
+ getAudioStreamCodec,
+ runLiveMuxing,
+ convertWebPToJPG,
+ getVideoStreamSize,
getVideoFileResolution,
+ getMetadataFromFile,
getDurationFromVideoFile,
+ runLiveTranscoding,
generateImageFromVideoFile,
+ TranscodeOptions,
+ TranscodeOptionsType,
transcode,
- getVideoFileFPS
+ getVideoFileFPS,
+ computeResolutionsToTranscode,
+ audio,
+ hlsPlaylistToFragmentedMP4,
+ getVideoFileBitrate,
+ canDoQuickTranscode
}
// ---------------------------------------------------------------------------
-function getVideoFileStream (path: string) {
- return new Promise<any>((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) throw new Error('Cannot find video stream of ' + path)
+function addDefaultLiveHLSParams (command: ffmpeg.FfmpegCommand, outPath: string, deleteSegments: boolean) {
+ command.outputOption('-hls_time ' + VIDEO_LIVE.SEGMENT_TIME_SECONDS)
+ command.outputOption('-hls_list_size ' + VIDEO_LIVE.SEGMENTS_LIST_SIZE)
- return res(videoStream)
- })
- })
+ if (deleteSegments === true) {
+ command.outputOption('-hls_flags delete_segments')
+ }
+
+ command.outputOption(`-hls_segment_filename ${join(outPath, '%v-%04d.ts')}`)
+ command.outputOption('-master_pl_name master.m3u8')
+ command.outputOption(`-f hls`)
+
+ command.output(join(outPath, '%v.m3u8'))
+}
+
+async function buildx264Command (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) {
+ let fps = await getVideoFileFPS(options.inputPath)
+ if (
+ // On small/medium resolutions, limit FPS
+ options.resolution !== undefined &&
+ options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN &&
+ fps > VIDEO_TRANSCODING_FPS.AVERAGE
+ ) {
+ // Get closest standard framerate by modulo: downsampling has to be done to a divisor of the nominal fps value
+ fps = getClosestFramerateStandard(fps, 'STANDARD')
+ }
+
+ command = await presetH264(command, options.inputPath, options.resolution, fps)
+
+ if (options.resolution !== undefined) {
+ // '?x720' or '720x?' for example
+ const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}`
+ command = command.size(size)
+ }
+
+ if (fps) {
+ // Hard FPS limits
+ if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = getClosestFramerateStandard(fps, 'HD_STANDARD')
+ else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN
+
+ command = command.withFPS(fps)
+ }
+
+ return command
+}
+
+async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: MergeAudioTranscodeOptions) {
+ command = command.loop(undefined)
+
+ command = await presetH264VeryFast(command, options.audioPath, options.resolution)
+
+ command = command.input(options.audioPath)
+ .videoFilter('scale=trunc(iw/2)*2:trunc(ih/2)*2') // Avoid "height not divisible by 2" error
+ .outputOption('-tune stillimage')
+ .outputOption('-shortest')
+
+ return command
+}
+
+function buildOnlyAudioCommand (command: ffmpeg.FfmpegCommand, options: OnlyAudioTranscodeOptions) {
+ command = presetOnlyAudio(command)
+
+ return command
+}
+
+function buildQuickTranscodeCommand (command: ffmpeg.FfmpegCommand) {
+ command = presetCopy(command)
+
+ command = command.outputOption('-map_metadata -1') // strip all metadata
+ .outputOption('-movflags faststart')
+
+ return command
+}
+
+async function buildHLSVODCommand (command: ffmpeg.FfmpegCommand, options: HLSTranscodeOptions) {
+ const videoPath = getHLSVideoPath(options)
+
+ if (options.copyCodecs) command = presetCopy(command)
+ else if (options.resolution === VideoResolution.H_NOVIDEO) command = presetOnlyAudio(command)
+ else command = await buildx264Command(command, options)
+
+ command = command.outputOption('-hls_time 4')
+ .outputOption('-hls_list_size 0')
+ .outputOption('-hls_playlist_type vod')
+ .outputOption('-hls_segment_filename ' + videoPath)
+ .outputOption('-hls_segment_type fmp4')
+ .outputOption('-f hls')
+ .outputOption('-hls_flags single_file')
+
+ return command
+}
+
+function getHLSVideoPath (options: HLSTranscodeOptions) {
+ return `${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)
+}
+
+/**
+ * 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
+}
+
+/**
+ * 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('-movflags faststart')
+
+ addDefaultX264Params(localCommand)
+
+ 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
+}
+
+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
}
projects / github / Chocobozzz / PeerTube.git / blobdiff