[Bug 741104] dashdemux: add support for I frame based trick play

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741104
  GStreamer | gst-plugins-bad | git

--- Comment #2 from Chris Bass <floobleflam at gmail.com> 2014-12-08 11:22:43 UTC ---
Created an attachment (id=292297)
 View: https://bugzilla.gnome.org/attachment.cgi?id=292297
 Review: https://bugzilla.gnome.org/review?bug=741104&attachment=292297

Make qtdemux output only first sample from received segments

Attached is a proof-of-concept patch for qtdemux that adds support for I-frame
based trickplay.

The patch modifies qtdemux so that when |rate| > 1.0 it extracts and pushes
downstream only the first sample from each fragment that it receives, throwing
away any remaining data from the fragment that comes after this first sample.

Together with the patch to dashdemux, (patch 292295), this allows I-frame only
trickplay for DASH to be demonstrated.

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