[Bug 765456] New: Strange bug re-encoding video with GST 1.8.1 on Mac OS 10.10

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765456

            Bug ID: 765456
           Summary: Strange bug re-encoding video with GST 1.8.1 on Mac OS
                    10.10
    Classification: Platform
           Product: GStreamer
           Version: 1.8.1
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: don't know
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: andy at seventhstring.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

GST 1.8.1 on Mac OS 10.10

Here are commands for copy-and-copy-again of a video:

gst-launch-1.0 filesrc location=Bear.wmv ! decodebin ! videoconvert ! x264enc
bitrate=1280 ! mp4mux ! filesink location=out1.mp4

gst-launch-1.0 filesrc location=out1.mp4 ! decodebin ! videoconvert ! x264enc
bitrate=1280 ! mp4mux ! filesink location=out2.mp4

On Windows 10, GST 1.8.1, this works fine. But on Mac OS 10.10 the first copy
succeeds but the second one produces this:

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Redistribute latency...
Got context from element 'vtdechw0': gst.gl.GLDisplay=context,
gst.gl.GLDisplay=(GstGLDisplay)"\(GstGLDisplayCocoa\)\ gldisplaycocoa0";
ERROR: from element
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0: GStreamer
encountered a general stream error.
Additional debug info:
qtdemux.c(5423): gst_qtdemux_loop ():
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
streaming stopped, reason not-negotiated
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

For completeness I have placed the source file Bear.wmv here:
http://www.seventhstring.com/other2/Bear.wmv
though my impression is that this problem happens with pretty much any video.

Using GST 1.6.3 there is again no problem on Windows but on Mac both copies
appear to succeed: however the second copy won't play, QuickTime Player says
the file is corrupt.

Andy Robinson

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