1 import { FfmpegCommand, FilterSpecification } from 'fluent-ffmpeg'
2 import { join } from 'path'
3 import { VIDEO_LIVE } from '@server/initializers/constants'
4 import { AvailableEncoders } from '@shared/models'
5 import { logger, loggerTagsFactory } from '../logger'
6 import { buildStreamSuffix, getFFmpeg, getScaleFilter, StreamType } from './ffmpeg-commons'
7 import { getEncoderBuilderResult } from './ffmpeg-encoders'
8 import { addDefaultEncoderGlobalParams, addDefaultEncoderParams, applyEncoderOptions } from './ffmpeg-presets'
9 import { computeFPS } from './ffprobe-utils'
11 const lTags = loggerTagsFactory('ffmpeg')
13 async function getLiveTranscodingCommand (options: {
17 masterPlaylistName: string
26 availableEncoders: AvailableEncoders
29 const { inputUrl, outPath, resolutions, fps, bitrate, availableEncoders, profile, masterPlaylistName, ratio } = options
31 const command = getFFmpeg(inputUrl, 'live')
33 const varStreamMap: string[] = []
35 const complexFilter: FilterSpecification[] = [
39 options: resolutions.length,
40 outputs: resolutions.map(r => `vtemp${r}`)
44 command.outputOption('-sc_threshold 0')
46 addDefaultEncoderGlobalParams(command)
48 for (let i = 0; i < resolutions.length; i++) {
49 const resolution = resolutions[i]
50 const resolutionFPS = computeFPS(fps, resolution)
52 const baseEncoderBuilderParams = {
61 inputBitrate: bitrate,
68 videoType: 'live' as 'live'
72 const streamType: StreamType = 'video'
73 const builderResult = await getEncoderBuilderResult({ ...baseEncoderBuilderParams, streamType })
75 throw new Error('No available live video encoder found')
78 command.outputOption(`-map [vout${resolution}]`)
80 addDefaultEncoderParams({ command, encoder: builderResult.encoder, fps: resolutionFPS, streamNum: i })
83 'Apply ffmpeg live video params from %s using %s profile.', builderResult.encoder, profile,
84 { builderResult, fps: resolutionFPS, resolution, ...lTags() }
87 command.outputOption(`${buildStreamSuffix('-c:v', i)} ${builderResult.encoder}`)
88 applyEncoderOptions(command, builderResult.result)
91 inputs: `vtemp${resolution}`,
92 filter: getScaleFilter(builderResult.result),
93 options: `w=-2:h=${resolution}`,
94 outputs: `vout${resolution}`
99 const streamType: StreamType = 'audio'
100 const builderResult = await getEncoderBuilderResult({ ...baseEncoderBuilderParams, streamType })
101 if (!builderResult) {
102 throw new Error('No available live audio encoder found')
105 command.outputOption('-map a:0')
107 addDefaultEncoderParams({ command, encoder: builderResult.encoder, fps: resolutionFPS, streamNum: i })
110 'Apply ffmpeg live audio params from %s using %s profile.', builderResult.encoder, profile,
111 { builderResult, fps: resolutionFPS, resolution, ...lTags() }
114 command.outputOption(`${buildStreamSuffix('-c:a', i)} ${builderResult.encoder}`)
115 applyEncoderOptions(command, builderResult.result)
118 varStreamMap.push(`v:${i},a:${i}`)
121 command.complexFilter(complexFilter)
123 addDefaultLiveHLSParams(command, outPath, masterPlaylistName)
125 command.outputOption('-var_stream_map', varStreamMap.join(' '))
130 function getLiveMuxingCommand (inputUrl: string, outPath: string, masterPlaylistName: string) {
131 const command = getFFmpeg(inputUrl, 'live')
133 command.outputOption('-c:v copy')
134 command.outputOption('-c:a copy')
135 command.outputOption('-map 0:a?')
136 command.outputOption('-map 0:v?')
138 addDefaultLiveHLSParams(command, outPath, masterPlaylistName)
143 // ---------------------------------------------------------------------------
146 getLiveTranscodingCommand,
150 // ---------------------------------------------------------------------------
152 function addDefaultLiveHLSParams (command: FfmpegCommand, outPath: string, masterPlaylistName: string) {
153 command.outputOption('-hls_time ' + VIDEO_LIVE.SEGMENT_TIME_SECONDS)
154 command.outputOption('-hls_list_size ' + VIDEO_LIVE.SEGMENTS_LIST_SIZE)
155 command.outputOption('-hls_flags delete_segments+independent_segments')
156 command.outputOption(`-hls_segment_filename ${join(outPath, '%v-%06d.ts')}`)
157 command.outputOption('-master_pl_name ' + masterPlaylistName)
158 command.outputOption(`-f hls`)
160 command.output(join(outPath, '%v.m3u8'))