PeerTube/server/helpers/ffprobe-utils.ts

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import * as ffmpeg from 'fluent-ffmpeg'
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import { getMaxBitrate, VideoFileMetadata, VideoResolution } from '../../shared/models/videos'
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import { CONFIG } from '../initializers/config'
import { VIDEO_TRANSCODING_FPS } from '../initializers/constants'
import { logger } from './logger'
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/**
*
* Helpers to run ffprobe and extract data from the JSON output
*
*/
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function ffprobePromise (path: string) {
return new Promise<ffmpeg.FfprobeData>((res, rej) => {
ffmpeg.ffprobe(path, (err, data) => {
if (err) return rej(err)
return res(data)
})
})
}
async function getAudioStream (videoPath: string, existingProbe?: ffmpeg.FfprobeData) {
// 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
const data = existingProbe || await ffprobePromise(videoPath)
if (Array.isArray(data.streams)) {
const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio')
if (audioStream) {
return {
absolutePath: data.format.filename,
audioStream,
bitrate: parseInt(audioStream['bit_rate'] + '', 10)
}
}
}
return { absolutePath: data.format.filename }
}
function getMaxAudioBitrate (type: 'aac' | 'mp3' | string, bitrate: number) {
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const maxKBitrate = 384
const kToBits = (kbits: number) => kbits * 1000
// If we did not manage to get the bitrate, use an average value
if (!bitrate) return 256
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if (type === 'aac') {
switch (true) {
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case bitrate > kToBits(maxKBitrate):
return maxKBitrate
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default:
return -1 // we interpret it as a signal to copy the audio stream as is
}
}
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/*
a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac.
That's why, when using aac, we can go to lower kbit/sec. The equivalences
made here are not made to be accurate, especially with good mp3 encoders.
*/
switch (true) {
case bitrate <= kToBits(192):
return 128
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case bitrate <= kToBits(384):
return 256
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default:
return maxKBitrate
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}
}
async function getVideoStreamSize (path: string, existingProbe?: ffmpeg.FfprobeData) {
const videoStream = await getVideoStreamFromFile(path, existingProbe)
return videoStream === null
? { width: 0, height: 0 }
: { width: videoStream.width, height: videoStream.height }
}
async function getVideoStreamCodec (path: string) {
const videoStream = await getVideoStreamFromFile(path)
if (!videoStream) return ''
const videoCodec = videoStream.codec_tag_string
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if (videoCodec === 'vp09') return 'vp09.00.50.08'
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if (videoCodec === 'hev1') return 'hev1.1.6.L93.B0'
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const baseProfileMatrix = {
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avc1: {
High: '6400',
Main: '4D40',
Baseline: '42E0'
},
av01: {
High: '1',
Main: '0',
Professional: '2'
}
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}
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let baseProfile = baseProfileMatrix[videoCodec][videoStream.profile]
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if (!baseProfile) {
logger.warn('Cannot get video profile codec of %s.', path, { videoStream })
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baseProfile = baseProfileMatrix[videoCodec]['High'] // Fallback
}
if (videoCodec === 'av01') {
const level = videoStream.level
// Guess the tier indicator and bit depth
return `${videoCodec}.${baseProfile}.${level}M.08`
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}
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// Default, h264 codec
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let level = videoStream.level.toString(16)
if (level.length === 1) level = `0${level}`
return `${videoCodec}.${baseProfile}${level}`
}
async function getAudioStreamCodec (path: string, existingProbe?: ffmpeg.FfprobeData) {
const { audioStream } = await getAudioStream(path, existingProbe)
if (!audioStream) return ''
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const audioCodecName = audioStream.codec_name
if (audioCodecName === 'opus') return 'opus'
if (audioCodecName === 'vorbis') return 'vorbis'
if (audioCodecName === 'aac') return 'mp4a.40.2'
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logger.warn('Cannot get audio codec of %s.', path, { audioStream })
return 'mp4a.40.2' // Fallback
}
async function getVideoFileResolution (path: string, existingProbe?: ffmpeg.FfprobeData) {
const size = await getVideoStreamSize(path, existingProbe)
return {
videoFileResolution: Math.min(size.height, size.width),
isPortraitMode: size.height > size.width
}
}
async function getVideoFileFPS (path: string, existingProbe?: ffmpeg.FfprobeData) {
const videoStream = await getVideoStreamFromFile(path, existingProbe)
if (videoStream === null) return 0
for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) {
const valuesText: string = videoStream[key]
if (!valuesText) continue
const [ frames, seconds ] = valuesText.split('/')
if (!frames || !seconds) continue
const result = parseInt(frames, 10) / parseInt(seconds, 10)
if (result > 0) return Math.round(result)
}
return 0
}
async function getMetadataFromFile (path: string, existingProbe?: ffmpeg.FfprobeData) {
const metadata = existingProbe || await ffprobePromise(path)
return new VideoFileMetadata(metadata)
}
async function getVideoFileBitrate (path: string, existingProbe?: ffmpeg.FfprobeData) {
const metadata = await getMetadataFromFile(path, existingProbe)
return metadata.format.bit_rate as number
}
async function getDurationFromVideoFile (path: string, existingProbe?: ffmpeg.FfprobeData) {
const metadata = await getMetadataFromFile(path, existingProbe)
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return Math.round(metadata.format.duration)
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}
async function getVideoStreamFromFile (path: string, existingProbe?: ffmpeg.FfprobeData) {
const metadata = await getMetadataFromFile(path, existingProbe)
return metadata.streams.find(s => s.codec_type === 'video') || null
}
function computeResolutionsToTranscode (videoFileResolution: number, type: 'vod' | 'live') {
const configResolutions = type === 'vod'
? CONFIG.TRANSCODING.RESOLUTIONS
: CONFIG.LIVE.TRANSCODING.RESOLUTIONS
const resolutionsEnabled: number[] = []
// Put in the order we want to proceed jobs
const resolutions = [
VideoResolution.H_NOVIDEO,
VideoResolution.H_480P,
VideoResolution.H_360P,
VideoResolution.H_720P,
VideoResolution.H_240P,
VideoResolution.H_1080P,
VideoResolution.H_1440P,
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VideoResolution.H_4K
]
for (const resolution of resolutions) {
if (configResolutions[resolution + 'p'] === true && videoFileResolution > resolution) {
resolutionsEnabled.push(resolution)
}
}
return resolutionsEnabled
}
async function canDoQuickTranscode (path: string): Promise<boolean> {
if (CONFIG.TRANSCODING.PROFILE !== 'default') return false
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const probe = await ffprobePromise(path)
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return await canDoQuickVideoTranscode(path, probe) &&
await canDoQuickAudioTranscode(path, probe)
}
async function canDoQuickVideoTranscode (path: string, probe?: ffmpeg.FfprobeData): Promise<boolean> {
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const videoStream = await getVideoStreamFromFile(path, probe)
const fps = await getVideoFileFPS(path, probe)
const bitRate = await getVideoFileBitrate(path, probe)
const resolution = await getVideoFileResolution(path, probe)
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// If ffprobe did not manage to guess the bitrate
if (!bitRate) return false
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// check video params
if (videoStream == null) return false
if (videoStream['codec_name'] !== 'h264') return false
if (videoStream['pix_fmt'] !== 'yuv420p') return false
if (fps < VIDEO_TRANSCODING_FPS.MIN || fps > VIDEO_TRANSCODING_FPS.MAX) return false
if (bitRate > getMaxBitrate(resolution.videoFileResolution, fps, VIDEO_TRANSCODING_FPS)) return false
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return true
}
async function canDoQuickAudioTranscode (path: string, probe?: ffmpeg.FfprobeData): Promise<boolean> {
const parsedAudio = await getAudioStream(path, probe)
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if (!parsedAudio.audioStream) return true
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if (parsedAudio.audioStream['codec_name'] !== 'aac') return false
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const audioBitrate = parsedAudio.bitrate
if (!audioBitrate) return false
const maxAudioBitrate = getMaxAudioBitrate('aac', audioBitrate)
if (maxAudioBitrate !== -1 && audioBitrate > maxAudioBitrate) return false
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const channelLayout = parsedAudio.audioStream['channel_layout']
// Causes playback issues with Chrome
if (!channelLayout || channelLayout === 'unknown') return false
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return true
}
function getClosestFramerateStandard (fps: number, type: 'HD_STANDARD' | 'STANDARD'): number {
return VIDEO_TRANSCODING_FPS[type].slice(0)
.sort((a, b) => fps % a - fps % b)[0]
}
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function computeFPS (fpsArg: number, resolution: VideoResolution) {
let fps = fpsArg
if (
// On small/medium resolutions, limit FPS
resolution !== undefined &&
resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN &&
fps > VIDEO_TRANSCODING_FPS.AVERAGE
) {
// Get closest standard framerate by modulo: downsampling has to be done to a divisor of the nominal fps value
fps = getClosestFramerateStandard(fps, 'STANDARD')
}
// Hard FPS limits
if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = getClosestFramerateStandard(fps, 'HD_STANDARD')
else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN
return fps
}
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// ---------------------------------------------------------------------------
export {
getVideoStreamCodec,
getAudioStreamCodec,
getVideoStreamSize,
getVideoFileResolution,
getMetadataFromFile,
getMaxAudioBitrate,
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getVideoStreamFromFile,
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getDurationFromVideoFile,
getAudioStream,
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computeFPS,
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getVideoFileFPS,
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ffprobePromise,
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getClosestFramerateStandard,
computeResolutionsToTranscode,
getVideoFileBitrate,
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canDoQuickTranscode,
canDoQuickVideoTranscode,
canDoQuickAudioTranscode
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}