[gstreamer-bugs] [Bug 580731] qtmux needs mapping for ALAC

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-bad | Ver: 0.10.x




------- Comment #2 from Thiago Sousa Santos  2009-05-05 17:00 UTC -------
While trying to implement the feature I ran into some problems.

First, ffenc_alac is not working
(http://bugzilla.gnome.org/show_bug.cgi?id=581379).

So I tried to remux .mov files with alac audio from the link Christian
provided. The problem is that qtdemux gets some stuff under some point in the
'stsd' atom and puts in the caps as codec_data. Inspecting the file in the
link, there are a lot of different stuff under the 'stsd' atom, depending on
the version of the sound media description used. This way it gets difficult to
fill in the stsd atom again in qtmux.

So, in the ideal world, qtdemux should be able to parse the information
correctly and put those into caps in separate fields (if suitable) and put only
in codec_data what really belongs there (what would this be? someone knows?). 

ABI breakage has to be taken in consideration to update qtdemux to do this, one
intermediary change is to  parse the alac stsd correctly and add more info to
the caps (if there is info that should be added), maintaining the actual
codec_data as is, right? What alac decoders do we have currently? Only ffmpeg's
one?


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