Trick-play track via I-frames
In an HLS output group, you can support trick-play track by providing an I-frame-only manifest.
How the method works
When you create the HLS output group, you create one or more video outputs, in the usual way. For a reminder of the output group structure, look at the diagrams in Organize encodes in an HLS output group. In the output group, you enable the field to create an I-frame-only manifest that conforms to the HLS specification.
MediaLive produces two child manifests for each encode—one manifest for handling the video in the usual way, and the I-frame-only manifest. The I-frame-only manifest lets the downstream player identify specific video frames to request, to construct the trick-play track. So this trick-play track method doesn't produce additional encodes in the output group.
Each I-frame-only manifest contains the following:
-
One
#EXT-X-I-FRAMES-ONLYtag, to indicate that the manifest is I-frame-only. -
Many
#EXT-X-BYTERANGEentries. Each entry identifies the position of an I-frame position.
Setting up
You set up the trick-play track once for the entire HLS output group.
Note
The information in this section assumes that you are familiar with the general steps for creating a channel.
To set up an I-frame-only manifest
Include these steps when you create the HLS output group.
-
In the HLS output group, in Manifest and segments, for I-frame only playlists, choose ENABLED.
-
Set up the remaining fields in the output group as you normally would. Set up the video, audio, and captions outputs and encodes as you normally would.
