Thumbnails do not work for live source

Created by: TobbeEdgeware

I just made a live source with thumbnails in the live-source simulator. It is based on a VoD asset http://vm2.dashif.org/dash/vod/testpic_2s/Manifest_thumbs.mpd where the thumbnails appear nicely on top of the scrub bar.

However, the requested thumbnails for the live source, http://vm2.dashif.org/livesim-dev/testpic_2s/Manifest_thumbs.mpd, are not the ones corresponding to the live interval (relative epoch start) but to the 5min interval corresponding to the timeShiftBufferDepth. For example, thumbnail thumbs/757757690.jpg is the first image of segment V300/757757690.m4s, but thumbs/5.jpg is asked for instead.

By turning on the infinite availabilityTimeOffset option (ato_inf) one can check that this is indeed the case: http://vm2.dashif.org/livesim-dev/ato_inf/testpic_2s/Manifest_thumbs.mpd The thumbnails which appear correspond to the time on the scrub bar, and not to the time in the video as they should.

This is with the latest development commit: 83f00932