126 lines
3.8 KiB
TypeScript
126 lines
3.8 KiB
TypeScript
import { logger } from '@server/helpers/logger'
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import { getTargetBitrate, VideoResolution } from '../../shared/models/videos'
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import { AvailableEncoders, buildStreamSuffix, EncoderOptionsBuilder } from '../helpers/ffmpeg-utils'
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import {
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canDoQuickAudioTranscode,
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ffprobePromise,
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getAudioStream,
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getMaxAudioBitrate,
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getVideoFileBitrate,
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getVideoStreamFromFile
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} from '../helpers/ffprobe-utils'
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import { VIDEO_TRANSCODING_FPS } from '../initializers/constants'
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/**
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*
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* Available encoders and profiles for the transcoding jobs
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* These functions are used by ffmpeg-utils that will get the encoders and options depending on the chosen profile
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*
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*/
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// Resources:
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// * https://slhck.info/video/2017/03/01/rate-control.html
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// * https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate
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const defaultX264VODOptionsBuilder: EncoderOptionsBuilder = async ({ input, resolution, fps }) => {
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const targetBitrate = await buildTargetBitrate({ input, resolution, fps })
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if (!targetBitrate) return { outputOptions: [ ] }
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return {
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outputOptions: [
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`-r ${fps}`,
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`-maxrate ${targetBitrate}`,
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`-bufsize ${targetBitrate * 2}`
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]
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}
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}
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const defaultX264LiveOptionsBuilder: EncoderOptionsBuilder = async ({ resolution, fps, streamNum }) => {
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const targetBitrate = getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS)
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return {
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outputOptions: [
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`${buildStreamSuffix('-r:v', streamNum)} ${fps}`,
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`${buildStreamSuffix('-b:v', streamNum)} ${targetBitrate}`,
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`-maxrate ${targetBitrate}`,
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`-bufsize ${targetBitrate * 2}`
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]
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}
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}
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const defaultAACOptionsBuilder: EncoderOptionsBuilder = async ({ input, streamNum }) => {
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const probe = await ffprobePromise(input)
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if (await canDoQuickAudioTranscode(input, probe)) {
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logger.debug('Copy audio stream %s by AAC encoder.', input)
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return { copy: true, outputOptions: [] }
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}
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const parsedAudio = await getAudioStream(input, probe)
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// We try to reduce the ceiling bitrate by making rough matches of bitrates
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// Of course this is far from perfect, but it might save some space in the end
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const audioCodecName = parsedAudio.audioStream['codec_name']
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const bitrate = getMaxAudioBitrate(audioCodecName, parsedAudio.bitrate)
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logger.debug('Calculating audio bitrate of %s by AAC encoder.', input, { bitrate: parsedAudio.bitrate, audioCodecName })
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if (bitrate !== undefined && bitrate !== -1) {
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return { outputOptions: [ buildStreamSuffix('-b:a', streamNum), bitrate + 'k' ] }
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}
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return { outputOptions: [ ] }
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}
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const defaultLibFDKAACVODOptionsBuilder: EncoderOptionsBuilder = ({ streamNum }) => {
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return { outputOptions: [ buildStreamSuffix('-q:a', streamNum), '5' ] }
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}
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const availableEncoders: AvailableEncoders = {
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vod: {
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libx264: {
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default: defaultX264VODOptionsBuilder
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},
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aac: {
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default: defaultAACOptionsBuilder
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},
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libfdk_aac: {
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default: defaultLibFDKAACVODOptionsBuilder
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}
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},
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live: {
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libx264: {
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default: defaultX264LiveOptionsBuilder
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},
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aac: {
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default: defaultAACOptionsBuilder
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}
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}
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}
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// ---------------------------------------------------------------------------
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export {
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availableEncoders
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}
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// ---------------------------------------------------------------------------
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async function buildTargetBitrate (options: {
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input: string
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resolution: VideoResolution
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fps: number
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}) {
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const { input, resolution, fps } = options
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const probe = await ffprobePromise(input)
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const videoStream = await getVideoStreamFromFile(input, probe)
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if (!videoStream) return undefined
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const targetBitrate = getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS)
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// Don't transcode to an higher bitrate than the original file
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const fileBitrate = await getVideoFileBitrate(input, probe)
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return Math.min(targetBitrate, fileBitrate)
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}
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