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import { getAverageBitrate, getMinLimitBitrate } from '@shared/core-utils'
import { buildStreamSuffix, ffprobePromise, getAudioStream, getMaxAudioBitrate } from '@shared/ffmpeg'
import { EncoderOptionsBuilder, EncoderOptionsBuilderParams, VideoResolution } from '@shared/models'
const defaultX264VODOptionsBuilder: EncoderOptionsBuilder = (options: EncoderOptionsBuilderParams) => {
const { fps, inputRatio, inputBitrate, resolution } = options
const targetBitrate = getTargetBitrate({ inputBitrate, ratio: inputRatio, fps, resolution })
return {
outputOptions: [
...getCommonOutputOptions(targetBitrate),
`-r ${fps}`
]
}
}
const defaultX264LiveOptionsBuilder: EncoderOptionsBuilder = (options: EncoderOptionsBuilderParams) => {
const { streamNum, fps, inputBitrate, inputRatio, resolution } = options
const targetBitrate = getTargetBitrate({ inputBitrate, ratio: inputRatio, fps, resolution })
return {
outputOptions: [
...getCommonOutputOptions(targetBitrate, streamNum),
`${buildStreamSuffix('-r:v', streamNum)} ${fps}`,
`${buildStreamSuffix('-b:v', streamNum)} ${targetBitrate}`
]
}
}
const defaultAACOptionsBuilder: EncoderOptionsBuilder = async ({ input, streamNum, canCopyAudio }) => {
const probe = await ffprobePromise(input)
const parsedAudio = await getAudioStream(input, probe)
// We try to reduce the ceiling bitrate by making rough matches of bitrates
// Of course this is far from perfect, but it might save some space in the end
const audioCodecName = parsedAudio.audioStream['codec_name']
const bitrate = getMaxAudioBitrate(audioCodecName, parsedAudio.bitrate)
// Force stereo as it causes some issues with HLS playback in Chrome
const base = [ '-channel_layout', 'stereo' ]
if (bitrate !== -1) {
return { outputOptions: base.concat([ buildStreamSuffix('-b:a', streamNum), bitrate + 'k' ]) }
}
return { outputOptions: base }
}
const defaultLibFDKAACVODOptionsBuilder: EncoderOptionsBuilder = ({ streamNum }) => {
return { outputOptions: [ buildStreamSuffix('-q:a', streamNum), '5' ] }
}
export function getAvailableEncoders () {
return {
vod: {
libx264: {
default: defaultX264VODOptionsBuilder
},
aac: {
default: defaultAACOptionsBuilder
},
libfdk_aac: {
default: defaultLibFDKAACVODOptionsBuilder
}
},
live: {
libx264: {
default: defaultX264LiveOptionsBuilder
},
aac: {
default: defaultAACOptionsBuilder
}
}
}
}
export function getEncodersToTry () {
return {
vod: {
video: [ 'libx264' ],
audio: [ 'libfdk_aac', 'aac' ]
},
live: {
video: [ 'libx264' ],
audio: [ 'libfdk_aac', 'aac' ]
}
}
}
// ---------------------------------------------------------------------------
function getTargetBitrate (options: {
inputBitrate: number
resolution: VideoResolution
ratio: number
fps: number
}) {
const { inputBitrate, resolution, ratio, fps } = options
const capped = capBitrate(inputBitrate, getAverageBitrate({ resolution, fps, ratio }))
const limit = getMinLimitBitrate({ resolution, fps, ratio })
return Math.max(limit, capped)
}
function capBitrate (inputBitrate: number, targetBitrate: number) {
if (!inputBitrate) return targetBitrate
// Add 30% margin to input bitrate
const inputBitrateWithMargin = inputBitrate + (inputBitrate * 0.3)
return Math.min(targetBitrate, inputBitrateWithMargin)
}
function getCommonOutputOptions (targetBitrate: number, streamNum?: number) {
return [
`-preset veryfast`,
`${buildStreamSuffix('-maxrate:v', streamNum)} ${targetBitrate}`,
`${buildStreamSuffix('-bufsize:v', streamNum)} ${targetBitrate * 2}`,
// NOTE: b-strategy 1 - heuristic algorithm, 16 is optimal B-frames for it
`-b_strategy 1`,
// NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16
`-bf 16`
]
}
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