Appsink + Internal Data Error v4l2

[Alex Carr]

Hello,

I have run into a problem with a new capture card, I'm just looking
for some suggestions how to collect some more info and hopefully solve
this problem.. maybe it's actually an OpenCV or driver problem.

This is a working Gstreamer pipeline with this hardware, very happy
with this so far.

`gst-launch-1.0 v4l2src device=/dev/video0 -e ! video/x-raw,
framerate=30/1, width=1920, height=1080 ! xvimagesink`

However, This pipeline Does not work when supplied to a
cv2.VideoCapture() in OpenCV Python 4.1.0 when I've changed to an
Appsink over xvimagesink.

cap = cv2.VideoCapture('v4l2src device=/dev/video0 ! video/x-raw,
framerate=30/1, width=1920, height=1080 ! appsink')

-truncated vague error-
''Error with module v4l2src: Internal Data Error"

I've tried wait-on-eos=false (or true).

Maybe someone has run into this before, and might have some clue about
it. Thanks for your time.

-Alex
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[Nicolas Dufresne-5]

Le dim. 17 mai 2020 12 h 00, Alex Carr <[hidden email]> a écrit :

Hello,

I have run into a problem with a new capture card, I'm just looking
for some suggestions how to collect some more info and hopefully solve
this problem.. maybe it's actually an OpenCV or driver problem.

This is a working Gstreamer pipeline with this hardware, very happy
with this so far.

`gst-launch-1.0 v4l2src device=/dev/video0 -e ! video/x-raw,
framerate=30/1, width=1920, height=1080 ! xvimagesink`

However, This pipeline Does not work when supplied to a
cv2.VideoCapture() in OpenCV Python 4.1.0 when I've changed to an
Appsink over xvimagesink.

cap = cv2.VideoCapture('v4l2src device=/dev/video0 ! video/x-raw,
framerate=30/1, width=1920, height=1080 ! appsink')

-truncated vague error-
''Error with module v4l2src: Internal Data Error"

I've tried wait-on-eos=false (or true).

Maybe someone has run into this before, and might have some clue about
it. Thanks for your time.

OpenCV likely require specific video format not supported by your capture card. Consider adding videoconvert element in your pipeline.

-Alex
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gstreamer-devel mailing list
[hidden email]
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[Alex Carr]

Thank you for your response!

I thought I tried adding videoconvert before, but very happy it works now!

 

Thanks!

-Alex

On Sun, May 17, 2020, 18:28 Nicolas Dufresne <[hidden email]> wrote:

Le dim. 17 mai 2020 12 h 00, Alex Carr <[hidden email]> a écrit :

Hello,

I have run into a problem with a new capture card, I'm just looking
for some suggestions how to collect some more info and hopefully solve
this problem.. maybe it's actually an OpenCV or driver problem.

This is a working Gstreamer pipeline with this hardware, very happy
with this so far.

`gst-launch-1.0 v4l2src device=/dev/video0 -e ! video/x-raw,
framerate=30/1, width=1920, height=1080 ! xvimagesink`

However, This pipeline Does not work when supplied to a
cv2.VideoCapture() in OpenCV Python 4.1.0 when I've changed to an
Appsink over xvimagesink.

cap = cv2.VideoCapture('v4l2src device=/dev/video0 ! video/x-raw,
framerate=30/1, width=1920, height=1080 ! appsink')

-truncated vague error-
''Error with module v4l2src: Internal Data Error"

I've tried wait-on-eos=false (or true).

Maybe someone has run into this before, and might have some clue about
it. Thanks for your time.

OpenCV likely require specific video format not supported by your capture card. Consider adding videoconvert element in your pipeline.

-Alex
_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel