[gst-devel] Help setting frame rate with videorate

[Aaron Lindsey]

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