Please help with filter caps.

[gtissington]

Hi 

I'm a gstreamer newb.. would appreciate any advice on this one.

I have a Logitech c910 web ca connected to a debian 6 machine.

GUVCview can use it at 30/1 fps, w=1920 h=1080.  Picture is beautiful and real time.  I just can't get the caps filter right to do the same from gst-launch.   

1)    gst-launch v4l2src ! xvimagesink

This works...  the image is about 720p I think but frame rate is about 5fps

2)    gst-launch v4l2src ! video/x-raw-yuv, framerate=30/1, width=640, height=360 ! xvimagesink

This works pretty well.  Size and frame rate appear to be correct.     

3)    gst-launch v4l2src ! video/x-raw-yuv, framerate=30/1, width=1280, height=720 ! xvimagesink

This pipeline reports:     v4l2src0: Could not negotiate format     

Now, I kind of get why.  Because this camera will only deliver 720p30fps in MJPEG format.

However, I've tried everything I an think of and I just can't get the caps filter right.

How can I connect to the web cam in higher resolutions with mjpeg format?

Thanks for your help.

Garth

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[Kapil Agrawal]

you might want to try

gst-launch v4l2src ! image/jpeg, framerate=30/1, width=1280, height=720 ! decodebin ! xvimagesink

here decodebin will use appropriate jpegdecoder.

Best
Kapil

On Sat, Sep 10, 2011 at 7:15 AM, Garth Tissington <[hidden email]> wrote:

Hi 

I'm a gstreamer newb.. would appreciate any advice on this one.

I have a Logitech c910 web ca connected to a debian 6 machine.

GUVCview can use it at 30/1 fps, w=1920 h=1080.  Picture is beautiful and real time.  I just can't get the caps filter right to do the same from gst-launch.   

1)    gst-launch v4l2src ! xvimagesink

This works...  the image is about 720p I think but frame rate is about 5fps

2)    gst-launch v4l2src ! video/x-raw-yuv, framerate=30/1, width=640, height=360 ! xvimagesink

This works pretty well.  Size and frame rate appear to be correct.     

3)    gst-launch v4l2src ! video/x-raw-yuv, framerate=30/1, width=1280, height=720 ! xvimagesink

This pipeline reports:     v4l2src0: Could not negotiate format     

Now, I kind of get why.  Because this camera will only deliver 720p30fps in MJPEG format.

However, I've tried everything I an think of and I just can't get the caps filter right.

How can I connect to the web cam in higher resolutions with mjpeg format?

Thanks for your help.

Garth

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--
www.mediamagictechnologies.com (Gstreamer, ffmpeg, Red5, Streaming)
twitter handle: @gst_kaps
http://www.linkedin.com/in/kapilagrawal

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