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peertube/shared/ffmpeg/ffmpeg-vod.ts

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import { MutexInterface } from 'async-mutex'
import { FfmpegCommand } from 'fluent-ffmpeg'
import { readFile, writeFile } from 'fs-extra'
import { dirname } from 'path'
import { pick } from '@shared/core-utils'
import { VideoResolution } from '@shared/models'
import { FFmpegCommandWrapper, FFmpegCommandWrapperOptions } from './ffmpeg-command-wrapper'
import { ffprobePromise, getVideoStreamDimensionsInfo } from './ffprobe'
import { presetCopy, presetOnlyAudio, presetVOD } from './shared/presets'
export type TranscodeVODOptionsType = 'hls' | 'hls-from-ts' | 'quick-transcode' | 'video' | 'merge-audio' | 'only-audio'
export interface BaseTranscodeVODOptions {
type: TranscodeVODOptionsType
inputPath: string
outputPath: string
// Will be released after the ffmpeg started
// To prevent a bug where the input file does not exist anymore when running ffmpeg
inputFileMutexReleaser: MutexInterface.Releaser
resolution: number
fps: number
}
export interface HLSTranscodeOptions extends BaseTranscodeVODOptions {
type: 'hls'
copyCodecs: boolean
hlsPlaylist: {
videoFilename: string
}
}
export interface HLSFromTSTranscodeOptions extends BaseTranscodeVODOptions {
type: 'hls-from-ts'
isAAC: boolean
hlsPlaylist: {
videoFilename: string
}
}
export interface QuickTranscodeOptions extends BaseTranscodeVODOptions {
type: 'quick-transcode'
}
export interface VideoTranscodeOptions extends BaseTranscodeVODOptions {
type: 'video'
}
export interface MergeAudioTranscodeOptions extends BaseTranscodeVODOptions {
type: 'merge-audio'
audioPath: string
}
export interface OnlyAudioTranscodeOptions extends BaseTranscodeVODOptions {
type: 'only-audio'
}
export type TranscodeVODOptions =
HLSTranscodeOptions
| HLSFromTSTranscodeOptions
| VideoTranscodeOptions
| MergeAudioTranscodeOptions
| OnlyAudioTranscodeOptions
| QuickTranscodeOptions
// ---------------------------------------------------------------------------
export class FFmpegVOD {
private readonly commandWrapper: FFmpegCommandWrapper
private ended = false
constructor (options: FFmpegCommandWrapperOptions) {
this.commandWrapper = new FFmpegCommandWrapper(options)
}
async transcode (options: TranscodeVODOptions) {
const builders: {
[ type in TranscodeVODOptionsType ]: (options: TranscodeVODOptions) => Promise<void> | void
} = {
'quick-transcode': this.buildQuickTranscodeCommand.bind(this),
'hls': this.buildHLSVODCommand.bind(this),
'hls-from-ts': this.buildHLSVODFromTSCommand.bind(this),
'merge-audio': this.buildAudioMergeCommand.bind(this),
// TODO: remove, we merge this in buildWebVideoCommand
'only-audio': this.buildOnlyAudioCommand.bind(this),
'video': this.buildWebVideoCommand.bind(this)
}
this.commandWrapper.debugLog('Will run transcode.', { options })
const command = this.commandWrapper.buildCommand(options.inputPath)
.output(options.outputPath)
await builders[options.type](options)
command.on('start', () => {
setTimeout(() => {
options.inputFileMutexReleaser()
}, 1000)
})
await this.commandWrapper.runCommand()
await this.fixHLSPlaylistIfNeeded(options)
this.ended = true
}
isEnded () {
return this.ended
}
private async buildWebVideoCommand (options: TranscodeVODOptions) {
const { resolution, fps, inputPath } = options
if (resolution === VideoResolution.H_NOVIDEO) {
presetOnlyAudio(this.commandWrapper)
return
}
let scaleFilterValue: string
if (resolution !== undefined) {
const probe = await ffprobePromise(inputPath)
const videoStreamInfo = await getVideoStreamDimensionsInfo(inputPath, probe)
scaleFilterValue = videoStreamInfo?.isPortraitMode === true
? `w=${resolution}:h=-2`
: `w=-2:h=${resolution}`
}
await presetVOD({
commandWrapper: this.commandWrapper,
resolution,
input: inputPath,
canCopyAudio: true,
canCopyVideo: true,
fps,
scaleFilterValue
})
}
private buildQuickTranscodeCommand (_options: TranscodeVODOptions) {
const command = this.commandWrapper.getCommand()
presetCopy(this.commandWrapper)
command.outputOption('-map_metadata -1') // strip all metadata
.outputOption('-movflags faststart')
}
// ---------------------------------------------------------------------------
// Audio transcoding
// ---------------------------------------------------------------------------
private async buildAudioMergeCommand (options: MergeAudioTranscodeOptions) {
const command = this.commandWrapper.getCommand()
command.loop(undefined)
await presetVOD({
...pick(options, [ 'resolution' ]),
commandWrapper: this.commandWrapper,
input: options.audioPath,
canCopyAudio: true,
canCopyVideo: true,
fps: options.fps,
scaleFilterValue: this.getMergeAudioScaleFilterValue()
})
command.outputOption('-preset:v veryfast')
command.input(options.audioPath)
.outputOption('-tune stillimage')
.outputOption('-shortest')
}
private buildOnlyAudioCommand (_options: OnlyAudioTranscodeOptions) {
presetOnlyAudio(this.commandWrapper)
}
// Avoid "height not divisible by 2" error
private getMergeAudioScaleFilterValue () {
return 'trunc(iw/2)*2:trunc(ih/2)*2'
}
// ---------------------------------------------------------------------------
// HLS transcoding
// ---------------------------------------------------------------------------
private async buildHLSVODCommand (options: HLSTranscodeOptions) {
const command = this.commandWrapper.getCommand()
const videoPath = this.getHLSVideoPath(options)
if (options.copyCodecs) presetCopy(this.commandWrapper)
else if (options.resolution === VideoResolution.H_NOVIDEO) presetOnlyAudio(this.commandWrapper)
else await this.buildWebVideoCommand(options)
this.addCommonHLSVODCommandOptions(command, videoPath)
}
private buildHLSVODFromTSCommand (options: HLSFromTSTranscodeOptions) {
const command = this.commandWrapper.getCommand()
const videoPath = this.getHLSVideoPath(options)
command.outputOption('-c copy')
if (options.isAAC) {
// Required for example when copying an AAC stream from an MPEG-TS
// Since it's a bitstream filter, we don't need to reencode the audio
command.outputOption('-bsf:a aac_adtstoasc')
}
this.addCommonHLSVODCommandOptions(command, videoPath)
}
private addCommonHLSVODCommandOptions (command: FfmpegCommand, outputPath: string) {
return command.outputOption('-hls_time 4')
.outputOption('-hls_list_size 0')
.outputOption('-hls_playlist_type vod')
.outputOption('-hls_segment_filename ' + outputPath)
.outputOption('-hls_segment_type fmp4')
.outputOption('-f hls')
.outputOption('-hls_flags single_file')
}
private async fixHLSPlaylistIfNeeded (options: TranscodeVODOptions) {
if (options.type !== 'hls' && options.type !== 'hls-from-ts') return
const fileContent = await readFile(options.outputPath)
const videoFileName = options.hlsPlaylist.videoFilename
const videoFilePath = this.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)
}
private getHLSVideoPath (options: HLSTranscodeOptions | HLSFromTSTranscodeOptions) {
return `${dirname(options.outputPath)}/${options.hlsPlaylist.videoFilename}`
}
}