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)
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 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)
+ .renice(5) // we don't want to make the system unrepsonsive
+ .preset(standard)
+ let fps = await getVideoFileFPS(options.inputPath)
if (options.resolution !== undefined) {
// '?x720' or '720x?' for example
const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}`
command = command.size(size)
+
+ // On small/medium resolutions, limit FPS
+ if (
+ options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN &&
+ fps > VIDEO_TRANSCODING_FPS.AVERAGE
+ ) {
+ fps = VIDEO_TRANSCODING_FPS.AVERAGE
+ }
+ }
+
+ 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
})
})
}
+
+/**
+ * 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: number | string = 0) => {
+ // 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<any>((res, rej) => {
+ _ffmpeg
+ .ffprobe(pos, (err,data) => {
+ if (err) return rej(err)
+
+ if ('streams' in data) {
+ return res(data['streams'].find(stream => stream['codec_type'] === 'audio'))
+ } else {
+ rej()
+ }
+ })
+ })
+ }
+
+ 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 localFfmpeg = _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('-map_metadata -1') // strip all metadata
+ .outputOption('-movflags faststart')
+ let _audio = audio.get(localFfmpeg)
+ .then(res => res)
+ .catch(_ => undefined)
+
+ if (!_audio) return localFfmpeg.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 localFfmpeg.audioCodec('copy')
+ }
+ }
+
+ // we favor VBR, if a good AAC encoder is available
+ if ((await checkFFmpegEncoders()).get('libfdk_aac')) {
+ return localFfmpeg
+ .audioCodec('libfdk_aac')
+ .audioQuality(5)
+ }
+
+ return localFfmpeg.audioBitrate(_bitrate)
+}
projects / github / Chocobozzz / PeerTube.git / blobdiff