[gst-devel] VC-1 support on Windows and other platforms

[Andreas Schuler]

Thanks for your response. I will give the newer version of gst-ffmpeg a try
(I hope building it isn't too much of a headache and that it will be binary
compatible). I also looked at the DShow decoder wrapper, but somehow cannot
instantiate it. I tried the following code:

GstElement* videoDecodebin = gst_element_factory_make ("dshowdecwrapper",
"videodecodebin");

This always gives me a null object. I know I have the bad plugins installed
and gst-inspect does give me some reasonable output. Any thoughts on what I
might be missing?

The documentation is pretty light on this one but from what I could tell
based on the output from gst-inspect and the source code itself, it doesn't
look like this will actually work with VC1 (aka WMV9 AP, fourCC: WVC1). I am
assuming that this is because I am not using the latest version from CVS,
correct? Or am I missing something?

Thanks again,

Andreas


On 3/29/08, Edward Hervey <edward.hervey at collabora.co.uk> wrote:
>
> Hi,
>
>   Even though VC1 support was added a long time ago in ffmpeg,
> gst-ffmpeg uses specific revisions of upstream ffmpeg (for reasons
> outside the scope of this mail).
>   The latest release of gst-ffmpeg (0.10.2) was still using a revision
> from a long time ago.
>
>   The current cvs head of gst-ffmpeg uses a much recent revision, with
> which VC1 indeed works.
>   You could also, if you're on windows, use the directshow wrappers
> available in -bad. They will provide VC1 support (amongst other
> formats).
>
>    Edward
>
>
> On Fri, 2008-03-28 at 16:42 -0500, Andreas Schuler wrote:
> > Hi all,
> >
> > I am currently evaluating GStreamer for a project I am working on. The
> > bulk of the content I am dealing with is encoded in VC-1 (WMA for
> > audio). I have spent quite a bit of time getting more familiar with
> > the GStreamer concepts but I have not been able to play back a WMV
> > file (with VC-1 encoded video) yet.
> >
> > I have tried using the playbin, playbin2, as well as a custom built
> > pipeline (using the decodebin). I also tried with the ASF demuxer so I
> > could inspect the video caps at its output. There I was able to
> > confirm that the fourcc is correctly identified as WMVC1.
> >
> > Despite a number of attempts I have not been able to get my WMV file
> > to show any video (audio is working fine). I have tried other files
> > (xvid encoded), which are working fine.
> >
> > I assumed that this should work since ffmpeg has been supporting VC-1
> > decoding for some time now.
> >
> > I am using the following versions (mainly because those are the most
> > recent Windows binaries available):
> >
> > GStreamer: 0.10.17
> > gst-plugins-base: 0.10.17
> > gst-plugins-good: 0.10.7
> > gst-plugins-bad: 0.10.6
> > gst-plugins-ugly: 0.10.7
> > gst-ffmpeg: 0.10.2
> >
> > Can anyone tell me whether VC-1 is currently supported by GStreamer
> > (on Windows and other platforms), or whether there must be a problem
> > with my setup somehow? Also, if VC-1 currently isn't supported, are
> > there any plans to include that in the near future? And, will VC-1
> > encoding also available at some point?
> >
> > Thanks,
> >
> > Andreas
> >
> >
> >
> >
> >
>
> >
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> > _______________________________________________ gstreamer-devel mailing
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>
> --
> Edward Hervey
> Lead Platforms Engineer / Director
> Collabora Multimedia
>
>


-- 
Andreas Schuler
CTO
Neokast LLC
Metis Enterprise Technologies LLC
990 Grove St. Suite #401
Evanston, IL 60201
847.328.7265
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andreas at neokast.com
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