[Bug 709111] matroskamux does not update header when sink pads dynamically added/removed

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=709111
  GStreamer | gst-plugins-good | 1.2.0

--- Comment #17 from Sebastian Dröge (slomo) <slomo at circular-chaos.org> 2013-10-02 16:17:04 UTC ---
At the start of a h264 stream there should be a keyframe. If it isn't you're
probably doing something special already with dynamic pipelines and then it's
your job :) Or you're having a stream that was cut, in which case it's also
something you should ensure.

It's probably not strictly required for Matroska streams to start with
keyframes, but without it could become painful to handle for applications... if
a frame of the new stream for example references a frame of the old one. That's
why I'm thinking it should be done at a higher level than matroskamux, like
what is done in hlssink for example.

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