gst-launch v4l2src Could not negotiate format

rich cagley

I have a custom camera driver that is raw monochrome 640x480 in the V4L2_MBUS_FMT_Y8_1X8 format.

Media control and yavta output work great

media-ctl -r
media-ctl -v -l '"ov7690 2-0021":0->"OMAP3 ISP CCDC":0[1]'
media-ctl -v -l '"OMAP3 ISP CCDC":1->"OMAP3 ISP CCDC output":0[1]'
media-ctl -v -f '"ov7690 2-0021":0 [Y8 640x480]'
media-ctl -v -f '"OMAP3 ISP CCDC":1 [Y8 640x480]'
yavta -p -f Y8 -s 640x480 -n 1 --capture=2 --skip 0 /dev/video2 --file=img.bin

But, I can't get any gst-launch commands to work

gst-launch -v v4l2src device=/dev/video2 ! \
video/x-raw-gray,bpp=8,depth=8,width=640,height=480,framerate=30/1,format=Y8 ! \
fakesink

ERROR: Pipeline doesn't want to pause.
ERROR: from element /GstPipeline:pipeline0/GstV4
Could not negotiate format

Any ideas what I could be doing wrong?

over 12 years ago

0 Paul Filitchkin over 12 years ago

Prodigy 20 points

This may help: http://lists.freedesktop.org/archives/gstreamer-devel/2011-July/032430.html

I believe Gstreamer is saying that the format in the command is not supported by the driver or it cannot read the supported formats from the driver.

0 rich cagley over 12 years ago in reply to Paul Filitchkin

Intellectual 290 points

Sorry, I don't think I presented the problem well. The link you sent is for someone trying to read a format from a camera that is not supported. Mine is Y8 (note the media-ctl -f commands). I'm specifying caps that are Y8 also in the gst-launch. These should be compatible.

0 Alexy over 12 years ago

Prodigy 45 points

Hi, Which version of DVSDK are you using?

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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gst-launch v4l2src Could not negotiate format