Implement remote runner jobs in server

Move ffmpeg functions to @shared

server/lib/transcoding/transcoding-quick-transcode.ts

@@ -0,0 +1,61 @@
+import { FfprobeData } from 'fluent-ffmpeg'
+import { CONFIG } from '@server/initializers/config'
+import { VIDEO_TRANSCODING_FPS } from '@server/initializers/constants'
+import { getMaxBitrate } from '@shared/core-utils'
+import {
+  ffprobePromise,
+  getAudioStream,
+  getMaxAudioBitrate,
+  getVideoStream,
+  getVideoStreamBitrate,
+  getVideoStreamDimensionsInfo,
+  getVideoStreamFPS
+} from '@shared/ffmpeg'
+
+export async function canDoQuickTranscode (path: string, existingProbe?: FfprobeData): Promise<boolean> {
+  if (CONFIG.TRANSCODING.PROFILE !== 'default') return false
+
+  const probe = existingProbe || await ffprobePromise(path)
+
+  return await canDoQuickVideoTranscode(path, probe) &&
+         await canDoQuickAudioTranscode(path, probe)
+}
+
+export async function canDoQuickAudioTranscode (path: string, probe?: FfprobeData): Promise<boolean> {
+  const parsedAudio = await getAudioStream(path, probe)
+
+  if (!parsedAudio.audioStream) return true
+
+  if (parsedAudio.audioStream['codec_name'] !== 'aac') return false
+
+  const audioBitrate = parsedAudio.bitrate
+  if (!audioBitrate) return false
+
+  const maxAudioBitrate = getMaxAudioBitrate('aac', audioBitrate)
+  if (maxAudioBitrate !== -1 && audioBitrate > maxAudioBitrate) return false
+
+  const channelLayout = parsedAudio.audioStream['channel_layout']
+  // Causes playback issues with Chrome
+  if (!channelLayout || channelLayout === 'unknown' || channelLayout === 'quad') return false
+
+  return true
+}
+
+export async function canDoQuickVideoTranscode (path: string, probe?: FfprobeData): Promise<boolean> {
+  const videoStream = await getVideoStream(path, probe)
+  const fps = await getVideoStreamFPS(path, probe)
+  const bitRate = await getVideoStreamBitrate(path, probe)
+  const resolutionData = await getVideoStreamDimensionsInfo(path, probe)
+
+  // If ffprobe did not manage to guess the bitrate
+  if (!bitRate) return false
+
+  // check video params
+  if (!videoStream) 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({ ...resolutionData, fps })) return false
+
+  return true
+}