[Bug 752816] New: Can't mux stereo H.264 to qtmux

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752816

            Bug ID: 752816
           Summary: Can't mux stereo H.264 to qtmux
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: thaytan at noraisin.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

There's a disconnect between h264parse and qtmux when it comes to handling
stereoscopic/multiview H.264.

Initially, h264parse outputs caps with video/x-h264...profile=high. Later, when
it sees the Subset-SPS packet and knows it is handling stereo or multiview
content, it changes the caps.

However, at that point qtmux does:
0:00:00.296990888 19789 0x7fb0000025e0 WARN                   qtmux
gstqtmux.c:4052:gst_qt_mux_video_sink_set_caps:<mp4mux0> pad video_0 refused
renegotiation to video/x-h264, stream-format=(string)avc, alignment=(string)au,
width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1,
framerate=(fraction)10000000/333667, multiview-mode=(string)frame-by-frame,
multiview-flags=(GstVideoMultiviewFlagsSet)0:ffffffff:/right-view-first/left-flipped/left-flopped/right-flipped/right-flopped/half-aspect/mixed-mono,
parsed=(boolean)true, profile=(string)stereo-high, level=(string)3.1,
codec_data=(buffer)0180001fffe200196764001fac56805005b3ff0001000110005176301312d0094000156f80001f4b15a014016cffc000400040abf8fc2a4402000468ce3c8000046848e3c8

and everything halts.

I'm not sure how it should be resolved. It might be possible to make qtmux
allow caps changes until some data has been muxed, and refuse after. It's
likely more difficult to make h264parse delay the caps setting until later
"just in case" a subset SPS comes along.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.