import { unlinkPromise } from './core-utils'
import { processImage } from './image-utils'
import { logger } from './logger'
+import { checkFFmpegEncoders } from '../initializers/checker'
async function getVideoFileResolution (path: string) {
const videoStream = await getVideoFileStream(path)
return new Promise<void>(async (res, rej) => {
let command = ffmpeg(options.inputPath)
.output(options.outputPath)
- .videoCodec('libx264')
.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS)
- .outputOption('-movflags faststart')
- .outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorythm, 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('-crf 18')
+ .preset(standard)
let fps = await getVideoFileFPS(options.inputPath)
if (options.resolution !== undefined) {
})
})
}
+
+/**
+ * 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.
+ */
+function veryfast (ffmpeg) {
+ ffmpeg
+ .preset(standard)
+ .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,
+ since we want to reduce as much a possible the encoding burden,
+ altough not to the point of a livestream where there is a hard
+ constraint on the frames per second to be encoded.
+
+ why '--aq-mode=2 --aq-strength=1.3' instead of '-profile:v main'?
+ Make up for most of the loss of grain and macroblocking
+ with less computing power.
+ */
+}
+
+/**
+ * A preset optimised for a stillimage audio video
+ */
+function audio (ffmpeg) {
+ ffmpeg
+ .preset(veryfast)
+ .outputOption('-tune stillimage')
+}
+
+/**
+ * A toolbox to play with audio
+ */
+namespace audio {
+ export const get = (ffmpeg, pos = 0) => {
+ // without position, ffprobe considers the last input only
+ // we make it consider the first input only
+ ffmpeg
+ .ffprobe(pos, (_,data) => {
+ return data['streams'].find(stream => {
+ return stream['codec_type'] === 'audio'
+ })
+ })
+ }
+
+ export namespace bitrate {
+ export const baseKbitrate = 384
+
+ const toBits = (kbits: number): number => { return kbits * 8000 }
+
+ export const aac = (bitrate: number): number => {
+ switch (true) {
+ case bitrate > toBits(384):
+ return baseKbitrate
+ default:
+ return -1 // we interpret it as a signal to copy the audio stream as is
+ }
+ }
+
+ export const mp3 = (bitrate: number): number => {
+ 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 standard (ffmpeg) {
+ let _bitrate = audio.bitrate.baseKbitrate
+ let _ffmpeg = ffmpeg
+ .format('mp4')
+ .videoCodec('libx264')
+ .outputOption('-level 3.1') // 3.1 is the minimal ressource allocation for our highest supported resolution
+ .outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorythm, 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('-movflags faststart')
+ let _audio = audio.get(_ffmpeg)
+
+ if (!_audio) return _ffmpeg.noAudio()
+
+ // 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
+ if (audio.bitrate[_audio['codec_name']]) {
+ _bitrate = audio.bitrate[_audio['codec_name']](_audio['bit_rate'])
+ if (_bitrate === -1) {
+ return _ffmpeg.audioCodec('copy')
+ }
+ }
+
+ // we favor VBR, if a good AAC encoder is available
+ if ((await checkFFmpegEncoders()).get('libfdk_aac')) {
+ return _ffmpeg
+ .audioCodec('libfdk_aac')
+ .audioQuality(5)
+ }
+
+ return _ffmpeg.audioBitrate(_bitrate)
+}
async function checkFFmpeg (CONFIG: { TRANSCODING: { ENABLED: boolean } }) {
const Ffmpeg = require('fluent-ffmpeg')
const getAvailableCodecsPromise = promisify0(Ffmpeg.getAvailableCodecs)
-
const codecs = await getAvailableCodecsPromise()
+ const canEncode = [ 'libx264' ]
+
if (CONFIG.TRANSCODING.ENABLED === false) return undefined
- const canEncode = [ 'libx264' ]
for (const codec of canEncode) {
if (codecs[codec] === undefined) {
throw new Error('Unknown codec ' + codec + ' in FFmpeg.')
throw new Error('Unavailable encode codec ' + codec + ' in FFmpeg')
}
}
+
+ checkFFmpegEncoders()
+}
+
+// Optional encoders, if present, can be used to improve transcoding
+// Here we ask ffmpeg if it detects their presence on the system, so that we can later use them
+let supportedOptionalEncoders: Map<string, boolean>
+async function checkFFmpegEncoders (): Promise<Map<string, boolean>> {
+ if (supportedOptionalEncoders !== undefined) {
+ return supportedOptionalEncoders
+ }
+
+ const Ffmpeg = require('fluent-ffmpeg')
+ const getAvailableEncodersPromise = promisify0(Ffmpeg.getAvailableEncoders)
+ const encoders = await getAvailableEncodersPromise()
+ const optionalEncoders = [ 'libfdk_aac' ]
+ supportedOptionalEncoders = new Map<string, boolean>()
+
+ for (const encoder of optionalEncoders) {
+ supportedOptionalEncoders.set(encoder,
+ encoders[encoder] !== undefined
+ )
+ }
}
// We get db by param to not import it in this file (import orders)
export {
checkConfig,
checkFFmpeg,
+ checkFFmpegEncoders,
checkMissedConfig,
clientsExist,
usersExist,
projects / oweals / peertube.git / commitdiff