mirror of https://github.com/Chocobozzz/PeerTube
351 lines
11 KiB
TypeScript
351 lines
11 KiB
TypeScript
import * as ffmpeg from 'fluent-ffmpeg'
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import { join } from 'path'
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import { getTargetBitrate, VideoResolution } from '../../shared/models/videos'
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import { CONFIG, FFMPEG_NICE, VIDEO_TRANSCODING_FPS } from '../initializers/constants'
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import { processImage } from './image-utils'
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import { logger } from './logger'
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import { checkFFmpegEncoders } from '../initializers/checker-before-init'
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import { remove } from 'fs-extra'
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function computeResolutionsToTranscode (videoFileHeight: number) {
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const resolutionsEnabled: number[] = []
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const configResolutions = CONFIG.TRANSCODING.RESOLUTIONS
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// Put in the order we want to proceed jobs
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const resolutions = [
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VideoResolution.H_480P,
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VideoResolution.H_360P,
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VideoResolution.H_720P,
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VideoResolution.H_240P,
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VideoResolution.H_1080P
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]
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for (const resolution of resolutions) {
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if (configResolutions[ resolution + 'p' ] === true && videoFileHeight > resolution) {
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resolutionsEnabled.push(resolution)
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}
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}
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return resolutionsEnabled
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}
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async function getVideoFileResolution (path: string) {
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const videoStream = await getVideoFileStream(path)
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return {
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videoFileResolution: Math.min(videoStream.height, videoStream.width),
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isPortraitMode: videoStream.height > videoStream.width
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}
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}
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async function getVideoFileFPS (path: string) {
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const videoStream = await getVideoFileStream(path)
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for (const key of [ 'r_frame_rate' , 'avg_frame_rate' ]) {
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const valuesText: string = videoStream[key]
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if (!valuesText) continue
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const [ frames, seconds ] = valuesText.split('/')
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if (!frames || !seconds) continue
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const result = parseInt(frames, 10) / parseInt(seconds, 10)
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if (result > 0) return Math.round(result)
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}
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return 0
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}
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async function getVideoFileBitrate (path: string) {
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return new Promise<number>((res, rej) => {
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ffmpeg.ffprobe(path, (err, metadata) => {
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if (err) return rej(err)
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return res(metadata.format.bit_rate)
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})
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})
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}
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function getDurationFromVideoFile (path: string) {
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return new Promise<number>((res, rej) => {
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ffmpeg.ffprobe(path, (err, metadata) => {
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if (err) return rej(err)
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return res(Math.floor(metadata.format.duration))
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})
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})
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}
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async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) {
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const pendingImageName = 'pending-' + imageName
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const options = {
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filename: pendingImageName,
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count: 1,
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folder
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}
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const pendingImagePath = join(folder, pendingImageName)
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try {
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await new Promise<string>((res, rej) => {
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ffmpeg(fromPath, { niceness: FFMPEG_NICE.THUMBNAIL })
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.on('error', rej)
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.on('end', () => res(imageName))
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.thumbnail(options)
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})
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const destination = join(folder, imageName)
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await processImage({ path: pendingImagePath }, destination, size)
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} catch (err) {
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logger.error('Cannot generate image from video %s.', fromPath, { err })
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try {
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await remove(pendingImagePath)
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} catch (err) {
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logger.debug('Cannot remove pending image path after generation error.', { err })
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}
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}
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}
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type TranscodeOptions = {
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inputPath: string
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outputPath: string
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resolution?: VideoResolution
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isPortraitMode?: boolean
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}
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function transcode (options: TranscodeOptions) {
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return new Promise<void>(async (res, rej) => {
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try {
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let fps = await getVideoFileFPS(options.inputPath)
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// On small/medium resolutions, limit FPS
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if (
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options.resolution !== undefined &&
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options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN &&
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fps > VIDEO_TRANSCODING_FPS.AVERAGE
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) {
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fps = VIDEO_TRANSCODING_FPS.AVERAGE
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}
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let command = ffmpeg(options.inputPath, { niceness: FFMPEG_NICE.TRANSCODING })
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.output(options.outputPath)
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command = await presetH264(command, options.resolution, fps)
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if (CONFIG.TRANSCODING.THREADS > 0) {
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// if we don't set any threads ffmpeg will chose automatically
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command = command.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS)
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}
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if (options.resolution !== undefined) {
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// '?x720' or '720x?' for example
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const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}`
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command = command.size(size)
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}
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if (fps) {
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// Hard FPS limits
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if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = VIDEO_TRANSCODING_FPS.MAX
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else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN
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command = command.withFPS(fps)
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}
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command
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.on('error', (err, stdout, stderr) => {
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logger.error('Error in transcoding job.', { stdout, stderr })
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return rej(err)
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})
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.on('end', res)
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.run()
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} catch (err) {
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return rej(err)
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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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getVideoFileResolution,
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getDurationFromVideoFile,
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generateImageFromVideoFile,
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transcode,
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getVideoFileFPS,
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computeResolutionsToTranscode,
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audio,
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getVideoFileBitrate
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}
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// ---------------------------------------------------------------------------
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function getVideoFileStream (path: string) {
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return new Promise<any>((res, rej) => {
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ffmpeg.ffprobe(path, (err, metadata) => {
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if (err) return rej(err)
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const videoStream = metadata.streams.find(s => s.codec_type === 'video')
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if (!videoStream) throw new Error('Cannot find video stream of ' + path)
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return res(videoStream)
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})
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})
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}
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/**
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* A slightly customised version of the 'veryfast' x264 preset
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*
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* The veryfast preset is right in the sweet spot of performance
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* and quality. Superfast and ultrafast will give you better
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* performance, but then quality is noticeably worse.
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*/
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async function presetH264VeryFast (command: ffmpeg.FfmpegCommand, resolution: VideoResolution, fps: number): Promise<ffmpeg.FfmpegCommand> {
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let localCommand = await presetH264(command, resolution, fps)
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localCommand = localCommand.outputOption('-preset:v veryfast')
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.outputOption([ '--aq-mode=2', '--aq-strength=1.3' ])
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/*
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MAIN reference: https://slhck.info/video/2017/03/01/rate-control.html
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Our target situation is closer to a livestream than a stream,
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since we want to reduce as much a possible the encoding burden,
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altough not to the point of a livestream where there is a hard
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constraint on the frames per second to be encoded.
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why '--aq-mode=2 --aq-strength=1.3' instead of '-profile:v main'?
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Make up for most of the loss of grain and macroblocking
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with less computing power.
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*/
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return localCommand
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}
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/**
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* A preset optimised for a stillimage audio video
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*/
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async function presetStillImageWithAudio (
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command: ffmpeg.FfmpegCommand,
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resolution: VideoResolution,
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fps: number
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): Promise<ffmpeg.FfmpegCommand> {
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let localCommand = await presetH264VeryFast(command, resolution, fps)
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localCommand = localCommand.outputOption('-tune stillimage')
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return localCommand
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}
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/**
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* A toolbox to play with audio
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*/
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namespace audio {
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export const get = (option: ffmpeg.FfmpegCommand | string) => {
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// without position, ffprobe considers the last input only
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// we make it consider the first input only
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// if you pass a file path to pos, then ffprobe acts on that file directly
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return new Promise<{ absolutePath: string, audioStream?: any }>((res, rej) => {
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function parseFfprobe (err: any, data: ffmpeg.FfprobeData) {
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if (err) return rej(err)
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if ('streams' in data) {
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const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio')
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if (audioStream) {
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return res({
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absolutePath: data.format.filename,
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audioStream
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})
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}
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}
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return res({ absolutePath: data.format.filename })
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}
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if (typeof option === 'string') {
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return ffmpeg.ffprobe(option, parseFfprobe)
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}
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return option.ffprobe(parseFfprobe)
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})
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}
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export namespace bitrate {
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const baseKbitrate = 384
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const toBits = (kbits: number): number => { return kbits * 8000 }
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export const aac = (bitrate: number): number => {
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switch (true) {
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case bitrate > toBits(baseKbitrate):
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return baseKbitrate
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default:
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return -1 // we interpret it as a signal to copy the audio stream as is
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}
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}
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export const mp3 = (bitrate: number): number => {
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/*
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a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac.
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That's why, when using aac, we can go to lower kbit/sec. The equivalences
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made here are not made to be accurate, especially with good mp3 encoders.
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*/
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switch (true) {
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case bitrate <= toBits(192):
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return 128
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case bitrate <= toBits(384):
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return 256
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default:
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return baseKbitrate
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}
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}
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}
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}
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/**
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* Standard profile, with variable bitrate audio and faststart.
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*
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* As for the audio, quality '5' is the highest and ensures 96-112kbps/channel
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* See https://trac.ffmpeg.org/wiki/Encode/AAC#fdk_vbr
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*/
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async function presetH264 (command: ffmpeg.FfmpegCommand, resolution: VideoResolution, fps: number): Promise<ffmpeg.FfmpegCommand> {
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let localCommand = command
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.format('mp4')
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.videoCodec('libx264')
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.outputOption('-level 3.1') // 3.1 is the minimal ressource allocation for our highest supported resolution
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.outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorythm, 16 is optimal B-frames for it
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.outputOption('-bf 16') // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16
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.outputOption('-pix_fmt yuv420p') // allows import of source material with incompatible pixel formats (e.g. MJPEG video)
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.outputOption('-map_metadata -1') // strip all metadata
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.outputOption('-movflags faststart')
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const parsedAudio = await audio.get(localCommand)
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if (!parsedAudio.audioStream) {
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localCommand = localCommand.noAudio()
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} else if ((await checkFFmpegEncoders()).get('libfdk_aac')) { // we favor VBR, if a good AAC encoder is available
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localCommand = localCommand
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.audioCodec('libfdk_aac')
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.audioQuality(5)
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} else {
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// we try to reduce the ceiling bitrate by making rough correspondances 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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let bitrate: number
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if (audio.bitrate[ audioCodecName ]) {
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bitrate = audio.bitrate[ audioCodecName ](parsedAudio.audioStream[ 'bit_rate' ])
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if (bitrate === -1) localCommand = localCommand.audioCodec('copy')
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else if (bitrate !== undefined) localCommand = localCommand.audioBitrate(bitrate)
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}
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}
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// Constrained Encoding (VBV)
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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 targetBitrate = getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS)
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localCommand = localCommand.outputOptions([`-maxrate ${ targetBitrate }`, `-bufsize ${ targetBitrate * 2 }`])
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// Keyframe interval of 2 seconds for faster seeking and resolution switching.
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// https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html
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// https://superuser.com/a/908325
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localCommand = localCommand.outputOption(`-g ${ fps * 2 }`)
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return localCommand
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}
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