[Bug 757009] hlsdemux: Fix switching between I-frame and normal playlists when seeking

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757009

--- Comment #7 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Thiago Sousa Santos from comment #6)
> Review of attachment 314227 [details] [review]:
> 
> Any reason why we don't just activate the I-frames list based on the
> trickmode flag? 

You mean GST_SEEK_FLAG_TRICKMODE vs GST_SEEK_FLAG_TRICKMODE_KEY_UNITS? The
latter is currently used. I don't know, why? :)

Also the main problem with all this is that I'm not aware of a single stream
with I frame playlists that actually has useful TS fragments in there that can
be decoded on their own. As such, enabling usage of I frame playlists generally
causes a streaming error at this point.

> Any use case where we want the decoder/demux to actually drop the
> non-i-frames buffers? Perhaps because the I-frame lists might not contain
> audio?

I don't know, depends on the stream I'd say? Because of that we should keep it
configurable in the seek event, but with which flags?

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