[gstreamer-bugs] [Bug 560305] New: x264enc & ffmux_* doesnt link

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-ffmpeg | Ver: HEAD CVS
           Summary: x264enc & ffmux_* doesnt link
           Product: GStreamer
           Version: HEAD CVS
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: gst-ffmpeg
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: kapil at fluendo.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: 2.23/2.24
   GNOME milestone: Unspecified


Please describe the problem:
If x264enc is tried to link with any of the ffmux_* it doesnt link, and gives
error "Aspect ratio mismatch between encoder and muxer layer". This comes since
x264enc src caps has "pixel-aspect-ratio=(fraction)1/1", while if I use
ffenc_mpeg4 it works since the src caps doesnt have any "pixel-aspect-ratio"
caps.
On further investigation it revealed that this problem occurs due to a probable
bug in ffmpeg ie, in "libavformat/utils.c: (av_write_header):" there is a
"av_cmp_q(st->sample_aspect_ratio, st->codec->sample_aspect_ratio)" check that
fails. This happens since the aspect ratio incase of x264enc is set in
st->codec->sample_aspect_ratio = {1, 1}, while the mux output
st->sample_aspect_ratio = {0, 1}. If this check is commented it works fine.

Steps to reproduce:
1. gst-launch-0.10 filesrc location=1.flv ! flvdemux ! ffdec_vp6f ! x264enc !
ffmux_3gp ! filesink location=test.3gp -v
2. gst-launch-0.10 filesrc location=1.flv ! flvdemux ! ffdec_vp6f ! ffenc_mpeg4
! ffmux_3gp ! filesink location=test.3gp -v



Actual results:
1. Doesnt work, gives error "Aspect ratio mismatch between encoder and muxer
layer"
2. Works.

Expected results:
x264enc case should also work.

Does this happen every time?
yes

Other information:
This is valid for any ffmux_*


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