Livestream API or transcoder API don't support I-frame-only playlist or EXT-X-IMAGE-STREAM-INF?

Hello

I cannot find clear information about the HLS tags supported by Livestream API and/or Transcoder API.

I am specifically looking to know if there is a way to include the EXT-X-IMAGE-STREAM-INF tags or create an I-frame-only HLS playlist.
Or if this possibility exists in DASH? Essentially, I need trick play and thumbnails.

Spritesheets do not seem to allow knowing the video’s timecode and/or frame.

Hey,

Hope you’re keeping well.

The Transcoder API currently does not generate I-frame-only playlists or include EXT-X-IMAGE-STREAM-INF tags in HLS manifests. Trick play and thumbnails are not natively supported in HLS/DASH outputs from Livestream API or Transcoder API beyond using sprite sheets. For timecode-aligned thumbnails, you’d need to post-process your transcoded outputs using a separate tool or pipeline, extracting I-frames and generating a custom manifest. If you need this integrated, consider running a Cloud Run or Dataflow job after Transcoder output to produce the additional HLS variant or DASH trick play track.

Thanks and regards,
Taz