1 files changed, 39 insertions, 0 deletions

diff --git a/packages/ffmpeg/src/shared/encoder-options.ts b/packages/ffmpeg/src/shared/encoder-options.ts
new file mode 100644
index 000000000..376a19186
--- /dev/null
+++ b/packages/ffmpeg/src/shared/encoder-options.ts
@@ -0,0 +1,39 @@
+import { FfmpegCommand } from 'fluent-ffmpeg'
+import { EncoderOptions } from '@peertube/peertube-models'
+import { buildStreamSuffix } from '../ffmpeg-utils.js'
+
+export function addDefaultEncoderGlobalParams (command: FfmpegCommand) {
+  // avoid issues when transcoding some files: https://trac.ffmpeg.org/ticket/6375
+  command.outputOption('-max_muxing_queue_size 1024')
+         // strip all metadata
+         .outputOption('-map_metadata -1')
+         // allows import of source material with incompatible pixel formats (e.g. MJPEG video)
+         .outputOption('-pix_fmt yuv420p')
+}
+
+export function addDefaultEncoderParams (options: {
+  command: FfmpegCommand
+  encoder: 'libx264' | string
+  fps: number
+
+  streamNum?: number
+}) {
+  const { command, encoder, fps, streamNum } = options
+
+  if (encoder === 'libx264') {
+    // 3.1 is the minimal resource allocation for our highest supported resolution
+    command.outputOption(buildStreamSuffix('-level:v', streamNum) + ' 3.1')
+
+    if (fps) {
+      // Keyframe interval of 2 seconds for faster seeking and resolution switching.
+      // https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html
+      // https://superuser.com/a/908325
+      command.outputOption(buildStreamSuffix('-g:v', streamNum) + ' ' + (fps * 2))
+    }
+  }
+}
+
+export function applyEncoderOptions (command: FfmpegCommand, options: EncoderOptions) {
+  command.inputOptions(options.inputOptions ?? [])
+    .outputOptions(options.outputOptions ?? [])
+}