UVC video output problem with 3.3.1 kernel

UVC video output problem with 3.3.1 kernel

[Chris Rankin]

Hi,

I have a UVC video device, which lsusb describes as:

046d:0992 Logitech, Inc. QuickCam Communicate Deluxe

With the 3.3.1 kernel, the bottom 3rd of the video window displayed by
guvcview is completely black. This happens whenever I select either
BGR3 or RGB3 as the video output format. However, YUYV, YU12 and YV12
all display fine.

Does anyone else see this, please?
Thanks,
Chris

Re: UVC video output problem with 3.3.1 kernel

[Paulo Assis]

Hi,
BGR3, RGB3, YU12 and YV12 are provided through libv4l, the original
unconverted stream format provided through uvcvideo driver is YUYV, if
this is fine then this is probably an issue with libv4l.

Regards,
Paulo

2012/4/5 Chris Rankin <rankincj@googlemail.com>:
> Hi,
>
> I have a UVC video device, which lsusb describes as:
>
> 046d:0992 Logitech, Inc. QuickCam Communicate Deluxe
>
> With the 3.3.1 kernel, the bottom 3rd of the video window displayed by
> guvcview is completely black. This happens whenever I select either
> BGR3 or RGB3 as the video output format. However, YUYV, YU12 and YV12
> all display fine.
>
> Does anyone else see this, please?
> Thanks,
> Chris
> --
> To unsubscribe from this list: send the line "unsubscribe linux-media" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: UVC video output problem with 3.3.1 kernel

[Paulo Assis]

Hi,
>From what you describe I would say that during conversion a YUYV (2
bytes per pixel) size (be it a buffer or loop iterations) is being
used for RGB3 (3 bytes per pixel), so you only get 2/3 of the picture.
Does this happen in any resolution ?

Regards,
Paulo

2012/4/5 Paulo Assis <pj.assis@gmail.com>:
> Hi,
> BGR3, RGB3, YU12 and YV12 are provided through libv4l, the original
> unconverted stream format provided through uvcvideo driver is YUYV, if
> this is fine then this is probably an issue with libv4l.
>
> Regards,
> Paulo
>
> 2012/4/5 Chris Rankin <rankincj@googlemail.com>:
>> Hi,
>>
>> I have a UVC video device, which lsusb describes as:
>>
>> 046d:0992 Logitech, Inc. QuickCam Communicate Deluxe
>>
>> With the 3.3.1 kernel, the bottom 3rd of the video window displayed by
>> guvcview is completely black. This happens whenever I select either
>> BGR3 or RGB3 as the video output format. However, YUYV, YU12 and YV12
>> all display fine.
>>
>> Does anyone else see this, please?
>> Thanks,
>> Chris
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-media" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: UVC video output problem with 3.3.1 kernel

[Chris Rankin]

 > Does this happen in any resolution ?


All resolutions except 960x720: in this resolution I only get a tiny strip of 
image across the top of the window.

Cheers,
Chris