[Bug 706774] New: qtdemux: handle multiple sample descriptions per track

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=706774
  GStreamer | gst-plugins-good | git

           Summary: qtdemux: handle multiple sample descriptions per track
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: matej.knopp at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=253082)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=253082)
Patch

Apparently there can be multiple sample description per track, meaning that
different samples can be in different format. GStreamer doesn't handle this
currently, which can result in decoders getting buffers in format they can't
handle.

Attached patch makes sure that samples in other formats than specified in first
sample description are ignored, with one exception. If first sample description
is JPEG and there is another sample description after it, the second sample
description is used as it is potentially a video track (first jpeg being still
image). This is hacky, ideally we should expose the image and handle format
switches somehow, but this is enough to get basic playback of this insanity
working.

Sample video:
https://s3.amazonaws.com/MatejK/Samples/qtdemux-multiple-sample-descriptions.mov
Note that the audio track starts at 11s, so when testing make sure the
multiqueues can handle that :)

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