jeena/PeerTube
1
0
Fork 0
Code Issues Pull requests Projects Packages Wiki Activity Actions

Fix transcoding

Browse source
This commit is contained in:
Chocobozzz 2018-10-18 09:44:43 +02:00
parent e27ff5da6e
commit cdf4cb9eaf
No known key found for this signature in database
GPG key ID: 583A612D890159BE
6 changed files with 1548 additions and 89 deletions
Download patch file Download diff file Expand all files Collapse all files

169
server/helpers/ffmpeg-utils.ts
View file

@ -1,6 +1,6 @@
import * as ffmpeg from 'fluent-ffmpeg'
import { join } from 'path'
import { VideoResolution, getTargetBitrate } from '../../shared/models/videos'
import { getTargetBitrate, VideoResolution } from '../../shared/models/videos'
import { CONFIG, FFMPEG_NICE, VIDEO_TRANSCODING_FPS } from '../initializers'
import { processImage } from './image-utils'
import { logger } from './logger'
@ -116,46 +116,50 @@ type TranscodeOptions = {
function transcode (options: TranscodeOptions) {
return new Promise<void>(async (res, rej) => {
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
try {
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
}
let command = ffmpeg(options.inputPath, { niceness: FFMPEG_NICE.TRANSCODING })
.output(options.outputPath)
command = await presetH264(command, options.resolution, fps)
if (CONFIG.TRANSCODING.THREADS > 0) {
// if we don't set any threads ffmpeg will chose automatically
command = command.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS)
}
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)
}
command
.on('error', (err, stdout, stderr) => {
logger.error('Error in transcoding job.', { stdout, stderr })
return rej(err)
})
.on('end', res)
.run()
} catch (err) {
return rej(err)
}
let command = ffmpeg(options.inputPath, { niceness: FFMPEG_NICE.TRANSCODING })
.output(options.outputPath)
command = await presetH264(command, options.resolution, fps)
if (CONFIG.TRANSCODING.THREADS > 0) {
// if we don't set any threads ffmpeg will chose automatically
command = command.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS)
}
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)
}
command
.on('error', (err, stdout, stderr) => {
logger.error('Error in transcoding job.', { stdout, stderr })
return rej(err)
})
.on('end', res)
.run()
})
}
@ -194,11 +198,10 @@ function getVideoFileStream (path: string) {
* and quality. Superfast and ultrafast will give you better
* performance, but then quality is noticeably worse.
*/
async function presetH264VeryFast (ffmpeg: ffmpeg, resolution: VideoResolution, fps: number): ffmpeg {
const localFfmpeg = await presetH264(ffmpeg, resolution, fps)
localFfmpeg
.outputOption('-preset:v veryfast')
.outputOption(['--aq-mode=2', '--aq-strength=1.3'])
async function presetH264VeryFast (command: ffmpeg.FfmpegCommand, resolution: VideoResolution, fps: number): Promise<ffmpeg.FfmpegCommand> {
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,
@ -210,31 +213,39 @@ async function presetH264VeryFast (ffmpeg: ffmpeg, resolution: VideoResolution,
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 (ffmpeg: ffmpeg, resolution: VideoResolution, fps: number): ffmpeg {
const localFfmpeg = await presetH264VeryFast(ffmpeg, resolution, fps)
localFfmpeg
.outputOption('-tune stillimage')
async function presetStillImageWithAudio (
command: ffmpeg.FfmpegCommand,
resolution: VideoResolution,
fps: number
): Promise<ffmpeg.FfmpegCommand> {
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 = (_ffmpeg, pos: number | string = 0) => {
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) => {
_ffmpeg.ffprobe(pos, (err,data) => {
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')
const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio')
if (audioStream) {
return res({
absolutePath: data.format.filename,
@ -242,8 +253,15 @@ namespace audio {
})
}
}
return res({ absolutePath: data.format.filename })
})
}
if (typeof option === 'string') {
return ffmpeg.ffprobe(option, parseFfprobe)
}
return option.ffprobe(parseFfprobe)
})
}
@ -285,8 +303,8 @@ namespace audio {
* 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 (ffmpeg: ffmpeg, resolution: VideoResolution, fps: number): ffmpeg {
let localFfmpeg = ffmpeg
async function presetH264 (command: ffmpeg.FfmpegCommand, resolution: VideoResolution, fps: number): Promise<ffmpeg.FfmpegCommand> {
let localCommand = command
.format('mp4')
.videoCodec('libx264')
.outputOption('-level 3.1') // 3.1 is the minimal ressource allocation for our highest supported resolution
@ -294,41 +312,38 @@ async function presetH264 (ffmpeg: ffmpeg, resolution: VideoResolution, fps: num
.outputOption('-bf 16') // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16
.outputOption('-map_metadata -1') // strip all metadata
.outputOption('-movflags faststart')
const _audio = await audio.get(localFfmpeg)
if (!_audio.audioStream) {
return localFfmpeg.noAudio()
}
const parsedAudio = await audio.get(localCommand)
// we favor VBR, if a good AAC encoder is available
if ((await checkFFmpegEncoders()).get('libfdk_aac')) {
return localFfmpeg
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 ]) {
bitrate = audio.bitrate[ audioCodecName ](parsedAudio.audioStream[ 'bit_rate' ])
if (bitrate === -1) localCommand = localCommand.audioCodec('copy')
else if (bitrate !== undefined) localCommand = localCommand.audioBitrate(bitrate)
}
}
// 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 = _audio.audioStream['codec_name']
let bitrate: number
if (audio.bitrate[audioCodecName]) {
bitrate = audio.bitrate[audioCodecName](_audio.audioStream['bit_rate'])
if (bitrate === -1) return localFfmpeg.audioCodec('copy')
}
if (bitrate !== undefined) return localFfmpeg.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)
localFfmpeg = localFfmpeg.outputOptions([`-maxrate ${ targetBitrate }`, `-bufsize ${ targetBitrate * 2 }`])
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
localFfmpeg = localFfmpeg.outputOption(`-g ${ fps * 2 }`)
localCommand = localCommand.outputOption(`-g ${ fps * 2 }`)
return localFfmpeg
return localCommand
}