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peertube/server/helpers/ffmpeg-utils.ts
2021-08-06 14:13:26 +02:00

777 lines
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TypeScript

import { Job } from 'bull'
import * as ffmpeg from 'fluent-ffmpeg'
import { readFile, remove, writeFile } from 'fs-extra'
import { dirname, join } from 'path'
import { FFMPEG_NICE, VIDEO_LIVE } from '@server/initializers/constants'
import { pick } from '@shared/core-utils'
import {
AvailableEncoders,
EncoderOptions,
EncoderOptionsBuilder,
EncoderOptionsBuilderParams,
EncoderProfile,
VideoResolution
} from '../../shared/models/videos'
import { CONFIG } from '../initializers/config'
import { execPromise, promisify0 } from './core-utils'
import { computeFPS, ffprobePromise, getAudioStream, getVideoFileBitrate, getVideoFileFPS, getVideoFileResolution } from './ffprobe-utils'
import { processImage } from './image-utils'
import { logger } from './logger'
/**
*
* Functions that run transcoding/muxing ffmpeg processes
* Mainly called by lib/video-transcoding.ts and lib/live-manager.ts
*
*/
// ---------------------------------------------------------------------------
// Encoder options
// ---------------------------------------------------------------------------
type StreamType = 'audio' | 'video'
// ---------------------------------------------------------------------------
// Encoders support
// ---------------------------------------------------------------------------
// Detect supported encoders by ffmpeg
let supportedEncoders: Map<string, boolean>
async function checkFFmpegEncoders (peertubeAvailableEncoders: AvailableEncoders): Promise<Map<string, boolean>> {
if (supportedEncoders !== undefined) {
return supportedEncoders
}
const getAvailableEncodersPromise = promisify0(ffmpeg.getAvailableEncoders)
const availableFFmpegEncoders = await getAvailableEncodersPromise()
const searchEncoders = new Set<string>()
for (const type of [ 'live', 'vod' ]) {
for (const streamType of [ 'audio', 'video' ]) {
for (const encoder of peertubeAvailableEncoders.encodersToTry[type][streamType]) {
searchEncoders.add(encoder)
}
}
}
supportedEncoders = new Map<string, boolean>()
for (const searchEncoder of searchEncoders) {
supportedEncoders.set(searchEncoder, availableFFmpegEncoders[searchEncoder] !== undefined)
}
logger.info('Built supported ffmpeg encoders.', { supportedEncoders, searchEncoders })
return supportedEncoders
}
function resetSupportedEncoders () {
supportedEncoders = undefined
}
// ---------------------------------------------------------------------------
// Image manipulation
// ---------------------------------------------------------------------------
function convertWebPToJPG (path: string, destination: string): Promise<void> {
const command = ffmpeg(path, { niceness: FFMPEG_NICE.THUMBNAIL })
.output(destination)
return runCommand({ command, silent: true })
}
function processGIF (
path: string,
destination: string,
newSize: { width: number, height: number }
): Promise<void> {
const command = ffmpeg(path, { niceness: FFMPEG_NICE.THUMBNAIL })
.fps(20)
.size(`${newSize.width}x${newSize.height}`)
.output(destination)
return runCommand({ command })
}
async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) {
const pendingImageName = 'pending-' + imageName
const options = {
filename: pendingImageName,
count: 1,
folder
}
const pendingImagePath = join(folder, pendingImageName)
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 })
}
}
}
// ---------------------------------------------------------------------------
// Transcode meta function
// ---------------------------------------------------------------------------
type TranscodeOptionsType = 'hls' | 'hls-from-ts' | 'quick-transcode' | 'video' | 'merge-audio' | 'only-audio'
interface BaseTranscodeOptions {
type: TranscodeOptionsType
inputPath: string
outputPath: string
availableEncoders: AvailableEncoders
profile: string
resolution: number
isPortraitMode?: boolean
job?: Job
}
interface HLSTranscodeOptions extends BaseTranscodeOptions {
type: 'hls'
copyCodecs: boolean
hlsPlaylist: {
videoFilename: string
}
}
interface HLSFromTSTranscodeOptions extends BaseTranscodeOptions {
type: 'hls-from-ts'
isAAC: 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
| HLSFromTSTranscodeOptions
| VideoTranscodeOptions
| MergeAudioTranscodeOptions
| OnlyAudioTranscodeOptions
| QuickTranscodeOptions
const builders: {
[ type in TranscodeOptionsType ]: (c: ffmpeg.FfmpegCommand, o?: TranscodeOptions) => Promise<ffmpeg.FfmpegCommand> | ffmpeg.FfmpegCommand
} = {
'quick-transcode': buildQuickTranscodeCommand,
'hls': buildHLSVODCommand,
'hls-from-ts': buildHLSVODFromTSCommand,
'merge-audio': buildAudioMergeCommand,
'only-audio': buildOnlyAudioCommand,
'video': buildx264VODCommand
}
async function transcode (options: TranscodeOptions) {
logger.debug('Will run transcode.', { options })
let command = getFFmpeg(options.inputPath, 'vod')
.output(options.outputPath)
command = await builders[options.type](command, options)
await runCommand({ command, job: options.job })
await fixHLSPlaylistIfNeeded(options)
}
// ---------------------------------------------------------------------------
// Live muxing/transcoding functions
// ---------------------------------------------------------------------------
async function getLiveTranscodingCommand (options: {
rtmpUrl: string
outPath: string
masterPlaylistName: string
resolutions: number[]
// Input information
fps: number
bitrate: number
ratio: number
availableEncoders: AvailableEncoders
profile: string
}) {
const { rtmpUrl, outPath, resolutions, fps, bitrate, availableEncoders, profile, masterPlaylistName, ratio } = options
const input = rtmpUrl
const command = getFFmpeg(input, 'live')
const varStreamMap: string[] = []
const complexFilter: ffmpeg.FilterSpecification[] = [
{
inputs: '[v:0]',
filter: 'split',
options: resolutions.length,
outputs: resolutions.map(r => `vtemp${r}`)
}
]
command.outputOption('-sc_threshold 0')
addDefaultEncoderGlobalParams({ command })
for (let i = 0; i < resolutions.length; i++) {
const resolution = resolutions[i]
const resolutionFPS = computeFPS(fps, resolution)
const baseEncoderBuilderParams = {
input,
availableEncoders,
profile,
inputBitrate: bitrate,
inputRatio: ratio,
resolution,
fps: resolutionFPS,
streamNum: i,
videoType: 'live' as 'live'
}
{
const streamType: StreamType = 'video'
const builderResult = await getEncoderBuilderResult({ ...baseEncoderBuilderParams, streamType })
if (!builderResult) {
throw new Error('No available live video encoder found')
}
command.outputOption(`-map [vout${resolution}]`)
addDefaultEncoderParams({ command, encoder: builderResult.encoder, fps: resolutionFPS, streamNum: i })
logger.debug('Apply ffmpeg live video params from %s using %s profile.', builderResult.encoder, profile, builderResult)
command.outputOption(`${buildStreamSuffix('-c:v', i)} ${builderResult.encoder}`)
applyEncoderOptions(command, builderResult.result)
complexFilter.push({
inputs: `vtemp${resolution}`,
filter: getScaleFilter(builderResult.result),
options: `w=-2:h=${resolution}`,
outputs: `vout${resolution}`
})
}
{
const streamType: StreamType = 'audio'
const builderResult = await getEncoderBuilderResult({ ...baseEncoderBuilderParams, streamType })
if (!builderResult) {
throw new Error('No available live audio encoder found')
}
command.outputOption('-map a:0')
addDefaultEncoderParams({ command, encoder: builderResult.encoder, fps: resolutionFPS, streamNum: i })
logger.debug('Apply ffmpeg live audio params from %s using %s profile.', builderResult.encoder, profile, builderResult)
command.outputOption(`${buildStreamSuffix('-c:a', i)} ${builderResult.encoder}`)
applyEncoderOptions(command, builderResult.result)
}
varStreamMap.push(`v:${i},a:${i}`)
}
command.complexFilter(complexFilter)
addDefaultLiveHLSParams(command, outPath, masterPlaylistName)
command.outputOption('-var_stream_map', varStreamMap.join(' '))
return command
}
function getLiveMuxingCommand (rtmpUrl: string, outPath: string, masterPlaylistName: string) {
const command = getFFmpeg(rtmpUrl, 'live')
command.outputOption('-c:v copy')
command.outputOption('-c:a copy')
command.outputOption('-map 0:a?')
command.outputOption('-map 0:v?')
addDefaultLiveHLSParams(command, outPath, masterPlaylistName)
return command
}
function buildStreamSuffix (base: string, streamNum?: number) {
if (streamNum !== undefined) {
return `${base}:${streamNum}`
}
return base
}
// ---------------------------------------------------------------------------
// Default options
// ---------------------------------------------------------------------------
function addDefaultEncoderGlobalParams (options: {
command: ffmpeg.FfmpegCommand
}) {
const { command } = options
// avoid issues when transcoding some files: https://trac.ffmpeg.org/ticket/6375
command.outputOption('-max_muxing_queue_size 1024')
// strip all metadata
.outputOption('-map_metadata -1')
// NOTE: b-strategy 1 - heuristic algorithm, 16 is optimal B-frames for it
.outputOption('-b_strategy 1')
// NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16
.outputOption('-bf 16')
// allows import of source material with incompatible pixel formats (e.g. MJPEG video)
.outputOption('-pix_fmt yuv420p')
}
function addDefaultEncoderParams (options: {
command: ffmpeg.FfmpegCommand
encoder: 'libx264' | string
streamNum?: number
fps?: number
}) {
const { command, encoder, fps, streamNum } = options
if (encoder === 'libx264') {
// 3.1 is the minimal resource allocation for our highest supported resolution
command.outputOption(buildStreamSuffix('-level:v', streamNum) + ' 3.1')
if (fps) {
// 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
command.outputOption(buildStreamSuffix('-g:v', streamNum) + ' ' + (fps * 2))
}
}
}
function addDefaultLiveHLSParams (command: ffmpeg.FfmpegCommand, outPath: string, masterPlaylistName: string) {
command.outputOption('-hls_time ' + VIDEO_LIVE.SEGMENT_TIME_SECONDS)
command.outputOption('-hls_list_size ' + VIDEO_LIVE.SEGMENTS_LIST_SIZE)
command.outputOption('-hls_flags delete_segments+independent_segments')
command.outputOption(`-hls_segment_filename ${join(outPath, '%v-%06d.ts')}`)
command.outputOption('-master_pl_name ' + masterPlaylistName)
command.outputOption(`-f hls`)
command.output(join(outPath, '%v.m3u8'))
}
// ---------------------------------------------------------------------------
// Transcode VOD command builders
// ---------------------------------------------------------------------------
async function buildx264VODCommand (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) {
let fps = await getVideoFileFPS(options.inputPath)
fps = computeFPS(fps, options.resolution)
let scaleFilterValue: string
if (options.resolution !== undefined) {
scaleFilterValue = options.isPortraitMode === true
? `w=${options.resolution}:h=-2`
: `w=-2:h=${options.resolution}`
}
command = await presetVideo({ command, input: options.inputPath, transcodeOptions: options, fps, scaleFilterValue })
return command
}
async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: MergeAudioTranscodeOptions) {
command = command.loop(undefined)
const scaleFilterValue = getScaleCleanerValue()
command = await presetVideo({ command, input: options.audioPath, transcodeOptions: options, scaleFilterValue })
command.outputOption('-preset:v veryfast')
command = command.input(options.audioPath)
.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
}
function addCommonHLSVODCommandOptions (command: ffmpeg.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')
}
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 buildx264VODCommand(command, options)
addCommonHLSVODCommandOptions(command, videoPath)
return command
}
async function buildHLSVODFromTSCommand (command: ffmpeg.FfmpegCommand, options: HLSFromTSTranscodeOptions) {
const videoPath = 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')
}
addCommonHLSVODCommandOptions(command, videoPath)
return command
}
async function fixHLSPlaylistIfNeeded (options: TranscodeOptions) {
if (options.type !== 'hls' && options.type !== 'hls-from-ts') 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="${videoFileName}",`)
await writeFile(options.outputPath, newContent)
}
function getHLSVideoPath (options: HLSTranscodeOptions | HLSFromTSTranscodeOptions) {
return `${dirname(options.outputPath)}/${options.hlsPlaylist.videoFilename}`
}
// ---------------------------------------------------------------------------
// Transcoding presets
// ---------------------------------------------------------------------------
// Run encoder builder depending on available encoders
// Try encoders by priority: if the encoder is available, run the chosen profile or fallback to the default one
// If the default one does not exist, check the next encoder
async function getEncoderBuilderResult (options: EncoderOptionsBuilderParams & {
streamType: 'video' | 'audio'
input: string
availableEncoders: AvailableEncoders
profile: string
videoType: 'vod' | 'live'
}) {
const { availableEncoders, profile, streamType, videoType } = options
const encodersToTry = availableEncoders.encodersToTry[videoType][streamType]
const encoders = availableEncoders.available[videoType]
for (const encoder of encodersToTry) {
if (!(await checkFFmpegEncoders(availableEncoders)).get(encoder)) {
logger.debug('Encoder %s not available in ffmpeg, skipping.', encoder)
continue
}
if (!encoders[encoder]) {
logger.debug('Encoder %s not available in peertube encoders, skipping.', encoder)
continue
}
// An object containing available profiles for this encoder
const builderProfiles: EncoderProfile<EncoderOptionsBuilder> = encoders[encoder]
let builder = builderProfiles[profile]
if (!builder) {
logger.debug('Profile %s for encoder %s not available. Fallback to default.', profile, encoder)
builder = builderProfiles.default
if (!builder) {
logger.debug('Default profile for encoder %s not available. Try next available encoder.', encoder)
continue
}
}
const result = await builder(pick(options, [ 'input', 'resolution', 'inputBitrate', 'fps', 'inputRatio', 'streamNum' ]))
return {
result,
// If we don't have output options, then copy the input stream
encoder: result.copy === true
? 'copy'
: encoder
}
}
return null
}
async function presetVideo (options: {
command: ffmpeg.FfmpegCommand
input: string
transcodeOptions: TranscodeOptions
fps?: number
scaleFilterValue?: string
}) {
const { command, input, transcodeOptions, fps, scaleFilterValue } = options
let localCommand = command
.format('mp4')
.outputOption('-movflags faststart')
addDefaultEncoderGlobalParams({ command })
const probe = await ffprobePromise(input)
// Audio encoder
const parsedAudio = await getAudioStream(input, probe)
const bitrate = await getVideoFileBitrate(input, probe)
const { ratio } = await getVideoFileResolution(input, probe)
let streamsToProcess: StreamType[] = [ 'audio', 'video' ]
if (!parsedAudio.audioStream) {
localCommand = localCommand.noAudio()
streamsToProcess = [ 'video' ]
}
for (const streamType of streamsToProcess) {
const { profile, resolution, availableEncoders } = transcodeOptions
const builderResult = await getEncoderBuilderResult({
streamType,
input,
resolution,
availableEncoders,
profile,
fps,
inputBitrate: bitrate,
inputRatio: ratio,
videoType: 'vod' as 'vod'
})
if (!builderResult) {
throw new Error('No available encoder found for stream ' + streamType)
}
logger.debug(
'Apply ffmpeg params from %s for %s stream of input %s using %s profile.',
builderResult.encoder, streamType, input, profile, builderResult
)
if (streamType === 'video') {
localCommand.videoCodec(builderResult.encoder)
if (scaleFilterValue) {
localCommand.outputOption(`-vf ${getScaleFilter(builderResult.result)}=${scaleFilterValue}`)
}
} else if (streamType === 'audio') {
localCommand.audioCodec(builderResult.encoder)
}
applyEncoderOptions(localCommand, builderResult.result)
addDefaultEncoderParams({ command: localCommand, encoder: builderResult.encoder, fps })
}
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 applyEncoderOptions (command: ffmpeg.FfmpegCommand, options: EncoderOptions): ffmpeg.FfmpegCommand {
return command
.inputOptions(options.inputOptions ?? [])
.outputOptions(options.outputOptions ?? [])
}
function getScaleFilter (options: EncoderOptions): string {
if (options.scaleFilter) return options.scaleFilter.name
return 'scale'
}
// ---------------------------------------------------------------------------
// Utils
// ---------------------------------------------------------------------------
function getFFmpeg (input: string, type: 'live' | 'vod') {
// 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: type === 'live' ? FFMPEG_NICE.LIVE : FFMPEG_NICE.VOD,
cwd: CONFIG.STORAGE.TMP_DIR
})
const threads = type === 'live'
? CONFIG.LIVE.TRANSCODING.THREADS
: CONFIG.TRANSCODING.THREADS
if (threads > 0) {
// If we don't set any threads ffmpeg will chose automatically
command.outputOption('-threads ' + threads)
}
return command
}
function getFFmpegVersion () {
return new Promise<string>((res, rej) => {
(ffmpeg() as any)._getFfmpegPath((err, ffmpegPath) => {
if (err) return rej(err)
if (!ffmpegPath) return rej(new Error('Could not find ffmpeg path'))
return execPromise(`${ffmpegPath} -version`)
.then(stdout => {
const parsed = stdout.match(/ffmpeg version .?(\d+\.\d+(\.\d+)?)/)
if (!parsed || !parsed[1]) return rej(new Error(`Could not find ffmpeg version in ${stdout}`))
// Fix ffmpeg version that does not include patch version (4.4 for example)
let version = parsed[1]
if (version.match(/^\d+\.\d+$/)) {
version += '.0'
}
return res(version)
})
.catch(err => rej(err))
})
})
}
async function runCommand (options: {
command: ffmpeg.FfmpegCommand
silent?: boolean // false
job?: Job
}) {
const { command, silent = false, job } = options
return new Promise<void>((res, rej) => {
let shellCommand: string
command.on('start', cmdline => { shellCommand = cmdline })
command.on('error', (err, stdout, stderr) => {
if (silent !== true) logger.error('Error in ffmpeg.', { stdout, stderr })
rej(err)
})
command.on('end', (stdout, stderr) => {
logger.debug('FFmpeg command ended.', { stdout, stderr, shellCommand })
res()
})
if (job) {
command.on('progress', progress => {
if (!progress.percent) return
job.progress(Math.round(progress.percent))
.catch(err => logger.warn('Cannot set ffmpeg job progress.', { err }))
})
}
command.run()
})
}
// Avoid "height not divisible by 2" error
function getScaleCleanerValue () {
return 'trunc(iw/2)*2:trunc(ih/2)*2'
}
// ---------------------------------------------------------------------------
export {
getLiveTranscodingCommand,
getLiveMuxingCommand,
buildStreamSuffix,
convertWebPToJPG,
processGIF,
generateImageFromVideoFile,
TranscodeOptions,
TranscodeOptionsType,
transcode,
runCommand,
getFFmpegVersion,
resetSupportedEncoders,
// builders
buildx264VODCommand
}