[gst-devel] Help setting frame rate with videorate

[Edward Hervey]

Hi,

  Add a capsfilter informing the content is jpeg data at Xfps.

  Ex : gnomevfssrc ! image/jpeg,framerate=2/1 ! jpegdec ....

    Edward

On Wed, 2007-12-19 at 03:02 -0500, Aaron Lindsey wrote:
> Hi everyone.  I'm running into trouble converting a motion jpeg stream
> into an ogg theora file with gstreamer.  The following creates an ogg
> theora file with the correct timing and streams at 1 frame/sec:
> 
> gst-launch-0.10 -v gnomevfssrc
> location=http://url?resolution=320x240\&fps=1 ! jpegdec ! theoraenc !
> oggmux ! filesink location=test.ogg
> 
> When I up the framerate on my camera source to 2 frames/sec instead of 1 I
> get an ogg theora file running at half speed:
> 
> gst-launch-0.10 -v gnomevfssrc
> location=http://url?resolution=320x240\&fps=2 ! jpegdec ! theoraenc !
> oggmux ! filesink location=test.ogg
> 
> So, to attempt to fix this, I add in a videorate element with the correct
> framerate:
> 
> gst-launch-0.10 -v gnomevfssrc
> location=http://url?resolution=320x240\&fps=2 ! jpegdec ! videorate !
> video/x-raw-yuv,framerate=2/1 ! theoraenc ! oggmux ! filesink
> location=test.ogg
> 
> This results in the following output and the pipeline hangs without ever
> making it into the PLAYING state:
> 
> Setting pipeline to PAUSED ...
> Pipeline is PREROLLING ...
> /pipeline0/jpegdec0.src: caps = video/x-raw-yuv, format=(fourcc)I420,
> width=(int)320, height=(int)240, framerate=(fraction)0/1
> /pipeline0/videorate0.sink: caps = video/x-raw-yuv, format=(fourcc)I420,
> width=(int)320, height=(int)240, framerate=(fraction)0/1
> /pipeline0/videorate0.src: caps = video/x-raw-yuv, format=(fourcc)I420,
> framerate=(fraction)2/1, width=(int)320, height=(int)240
> /pipeline0/videorate0.sink: caps = video/x-raw-yuv, format=(fourcc)I420,
> width=(int)320, height=(int)240, framerate=(fraction)0/1
> 
> 
> How should I be setting the frame rate here so that the video encodes to
> the proper playing speed?  This is using the latest version of gstreamer
> provided by Ubuntu.  Thanks.
> 
> Aaron
> 
> 
> 
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-- 
Edward Hervey
Lead Platforms Engineer / Director
(+34) 666 350 320
Collabora Multimedia