From c729caf6cc34630877a0e5a1bda1719384cd0c8a Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Fri, 11 Feb 2022 10:51:33 +0100
Subject: Add basic video editor support

---
 server/helpers/ffmpeg/ffmpeg-live.ts | 161 +++++++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 server/helpers/ffmpeg/ffmpeg-live.ts

(limited to 'server/helpers/ffmpeg/ffmpeg-live.ts')

diff --git a/server/helpers/ffmpeg/ffmpeg-live.ts b/server/helpers/ffmpeg/ffmpeg-live.ts
new file mode 100644
index 000000000..ff571626c
--- /dev/null
+++ b/server/helpers/ffmpeg/ffmpeg-live.ts
@@ -0,0 +1,161 @@
+import { FfmpegCommand, FilterSpecification } from 'fluent-ffmpeg'
+import { join } from 'path'
+import { VIDEO_LIVE } from '@server/initializers/constants'
+import { AvailableEncoders } from '@shared/models'
+import { logger, loggerTagsFactory } from '../logger'
+import { buildStreamSuffix, getFFmpeg, getScaleFilter, StreamType } from './ffmpeg-commons'
+import { getEncoderBuilderResult } from './ffmpeg-encoders'
+import { addDefaultEncoderGlobalParams, addDefaultEncoderParams, applyEncoderOptions } from './ffmpeg-presets'
+import { computeFPS } from './ffprobe-utils'
+
+const lTags = loggerTagsFactory('ffmpeg')
+
+async function getLiveTranscodingCommand (options: {
+  inputUrl: string
+
+  outPath: string
+  masterPlaylistName: string
+
+  resolutions: number[]
+
+  // Input information
+  fps: number
+  bitrate: number
+  ratio: number
+
+  availableEncoders: AvailableEncoders
+  profile: string
+}) {
+  const { inputUrl, outPath, resolutions, fps, bitrate, availableEncoders, profile, masterPlaylistName, ratio } = options
+
+  const command = getFFmpeg(inputUrl, 'live')
+
+  const varStreamMap: string[] = []
+
+  const complexFilter: FilterSpecification[] = [
+    {
+      inputs: '[v:0]',
+      filter: 'split',
+      options: resolutions.length,
+      outputs: resolutions.map(r => `vtemp${r}`)
+    }
+  ]
+
+  command.outputOption('-sc_threshold 0')
+
+  addDefaultEncoderGlobalParams(command)
+
+  for (let i = 0; i < resolutions.length; i++) {
+    const resolution = resolutions[i]
+    const resolutionFPS = computeFPS(fps, resolution)
+
+    const baseEncoderBuilderParams = {
+      input: inputUrl,
+
+      availableEncoders,
+      profile,
+
+      canCopyAudio: true,
+      canCopyVideo: true,
+
+      inputBitrate: bitrate,
+      inputRatio: ratio,
+
+      resolution,
+      fps: resolutionFPS,
+
+      streamNum: i,
+      videoType: 'live' as 'live'
+    }
+
+    {
+      const streamType: StreamType = 'video'
+      const builderResult = await getEncoderBuilderResult({ ...baseEncoderBuilderParams, streamType })
+      if (!builderResult) {
+        throw new Error('No available live video encoder found')
+      }
+
+      command.outputOption(`-map [vout${resolution}]`)
+
+      addDefaultEncoderParams({ command, encoder: builderResult.encoder, fps: resolutionFPS, streamNum: i })
+
+      logger.debug(
+        'Apply ffmpeg live video params from %s using %s profile.', builderResult.encoder, profile,
+        { builderResult, fps: resolutionFPS, resolution, ...lTags() }
+      )
+
+      command.outputOption(`${buildStreamSuffix('-c:v', i)} ${builderResult.encoder}`)
+      applyEncoderOptions(command, builderResult.result)
+
+      complexFilter.push({
+        inputs: `vtemp${resolution}`,
+        filter: getScaleFilter(builderResult.result),
+        options: `w=-2:h=${resolution}`,
+        outputs: `vout${resolution}`
+      })
+    }
+
+    {
+      const streamType: StreamType = 'audio'
+      const builderResult = await getEncoderBuilderResult({ ...baseEncoderBuilderParams, streamType })
+      if (!builderResult) {
+        throw new Error('No available live audio encoder found')
+      }
+
+      command.outputOption('-map a:0')
+
+      addDefaultEncoderParams({ command, encoder: builderResult.encoder, fps: resolutionFPS, streamNum: i })
+
+      logger.debug(
+        'Apply ffmpeg live audio params from %s using %s profile.', builderResult.encoder, profile,
+        { builderResult, fps: resolutionFPS, resolution, ...lTags() }
+      )
+
+      command.outputOption(`${buildStreamSuffix('-c:a', i)} ${builderResult.encoder}`)
+      applyEncoderOptions(command, builderResult.result)
+    }
+
+    varStreamMap.push(`v:${i},a:${i}`)
+  }
+
+  command.complexFilter(complexFilter)
+
+  addDefaultLiveHLSParams(command, outPath, masterPlaylistName)
+
+  command.outputOption('-var_stream_map', varStreamMap.join(' '))
+
+  return command
+}
+
+function getLiveMuxingCommand (inputUrl: string, outPath: string, masterPlaylistName: string) {
+  const command = getFFmpeg(inputUrl, 'live')
+
+  command.outputOption('-c:v copy')
+  command.outputOption('-c:a copy')
+  command.outputOption('-map 0:a?')
+  command.outputOption('-map 0:v?')
+
+  addDefaultLiveHLSParams(command, outPath, masterPlaylistName)
+
+  return command
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  getLiveTranscodingCommand,
+  getLiveMuxingCommand
+}
+
+// ---------------------------------------------------------------------------
+
+function addDefaultLiveHLSParams (command: FfmpegCommand, outPath: string, masterPlaylistName: string) {
+  command.outputOption('-hls_time ' + VIDEO_LIVE.SEGMENT_TIME_SECONDS)
+  command.outputOption('-hls_list_size ' + VIDEO_LIVE.SEGMENTS_LIST_SIZE)
+  command.outputOption('-hls_flags delete_segments+independent_segments')
+  command.outputOption(`-hls_segment_filename ${join(outPath, '%v-%06d.ts')}`)
+  command.outputOption('-master_pl_name ' + masterPlaylistName)
+  command.outputOption(`-f hls`)
+
+  command.output(join(outPath, '%v.m3u8'))
+}
-- 
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