v4l2src Can Not Use PAL-B Correctly

[Osman Berk]

Hello;

I get a PAL-B video from my video card on jetson-tx2.

I can open it properly by setting video standart to PAL-B on vlc.

However when i set v4l2src norm= PAL-B I can not get a proper video.

Why could it be? Can not v4l2src set to PAL-B?
How can I set PAL-B with v4l2src?

Btw after vlc sets the video standart, I can get video from v4l2src properly
without any settings.


Is there a way for me to do the confirugation vlc does manually to
/dev/video#?





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[Nicolas Dufresne-5]

Le mardi 03 septembre 2019 à 04:31 -0500, Osman Berk a écrit :

> Hello;
>
> I get a PAL-B video from my video card on jetson-tx2.
>
> I can open it properly by setting video standart to PAL-B on vlc.
>
> However when i set v4l2src norm= PAL-B I can not get a proper video.
>
> Why could it be? Can not v4l2src set to PAL-B?
> How can I set PAL-B with v4l2src?

Would need some debugging, this feature is not very maintained.

>
> Btw after vlc sets the video standart, I can get video from v4l2src properly
> without any settings.
>
>
> Is there a way for me to do the confirugation vlc does manually to
> /dev/video#?

With v4l2-ctl CLI utility.

>
>
>
>
>
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[Osman Berk]

Hello,

 v4l2-ctl --device=/dev/videoX -s pal-B

I do use this command, however it does not fix the video footage totally.

The output is same as v4l2src norm= PAL-B.

What might vlc be doing with selecting signal as PAL-B, it fixes the device
completely.





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[Nicolas Dufresne-5]

Le mercredi 04 septembre 2019 à 05:37 -0500, Osman Berk a écrit :

> Hello,
>
>  v4l2-ctl --device=/dev/videoX -s pal-B
>
> I do use this command, however it does not fix the video footage totally.
>
> The output is same as v4l2src norm= PAL-B.
>
> What might vlc be doing with selecting signal as PAL-B, it fixes the device
> completely.

As root, you can check what vlc is doing by enabling some kernel debug.

  echo 0xff > /sys/class/video4linux/video0/dev_debug

Don't forget to change video0 with the name of the video node you are
using.

>
>
>
>
>
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