[gst-devel] ffdec_mpeg4 gets wrong frame rate from rtspsrc

[joh]

Thank you for the answer. I've already add the capsfilter to fix the
problem, but my app. should support many different types of sources, so I
can't hard code the frame rate.

Anyway, the videosink plays well with the decoder caps of framerate=100/1. I
think it means videosink does not look at the caps to play the stream, but
jpegenc or avimux does look at the framerate for recording.

I've investigated source code, but I coudn't find where the 100/1 came from.
The truth is that rtspsrc doesn't even care about "a=framerate..." field to
create cap, and it seems like not a mandatory attribute.

Anybody can tell me what how mp4vdepay or ffdec_mpeg4 sets frame rate?

Thank you in advance!

Justin



Is there anybody who can judge that this is a bug or not?


On Mon, Jul 20, 2009 at 2:48 AM, florian iragne <florian.iragne at viewsurf.com
> wrote:

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> joh a écrit :
> > Hi~
> >
> > My application gets the mpeg4 video stream from a AXIS camera and
> > displays it on a x-window. Everything works perfectly. However, I have a
> > problem with recording the video to the file. The problem is that
> > ffdec_mpeg4 gets or sets (not sure who has set)  wrong frame rate. The
> > sdp from rtspsrc said, the frame rate is 30/1 (sdp attribute belonged to
> > a media "a=framerate: 30.0"). However, the source pad of ffdec_mpeg4 has
> > frame rate of 100/1. So, When I record the stream and plays it, it runs
> > approximately three times faster than what it is suppoesed to do.
> >
> > I think either one of upstream elements, rtspsrc and rtpmp4vdepay, or
> > ffdec_mpeg4 is doing something wrong. Do you guys think it it a bug?
> > What's you think about it?
>
> don't know whether it's a bug or not, but you should try to define caps
> with a capsfilter element like capsfilter caps="framerate=(fraction)30/1"
>
>
> Florian
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