[gst-devel] Help setting frame rate with videorate

[Aaron Lindsey]

Edward, thanks for the quick reply.  I removed the videorate element and
added a caps filter per your last message:

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

I'm still producing video at half speed.  Any thoughts on what I'm messing
up?

Aaron

> 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
>
>