[Bug 754696] matroskamux: delta unit on each buffer for audio only stream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754696

--- Comment #2 from Nicola <lists at svrinformatica.it> ---
in my app I need to find keyframes, for audio only stream I have an hack since
the standard method (used in multifdsink/tcpserversink) does not work, you can
easily reproduce with this pipeline:

gst-launch-1.0 -v pulsesrc ! audioconvert ! audioresample ! queue ! mulawenc !
matroskamux streamable=true ! tcpserversink port=3000 sync-method=1

gst-launch-1.0 -v tcpclientsrc port=3000 ! matroskademux ! fakesink sync=false
silent=false

it works if you use sync-method=0 on the first pipeline

I think the muxer should properly mark audio buffers as keyframe unsetting the
delta unit flag

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