[mythtv-users] Live USB2 for HD-PVR Captions

Bob mythtv at cox.net
Mon Jan 3 15:45:42 UTC 2022


Trying to following the guide here: 
https://www.mythtv.org/wiki/Captions_with_HD-PVR

Using Hauppauge Live 2 USB device with Debian 11 (5.10.0-10-amd64). The 
device nodes have been created automatically. However, when I try the 
command below I get an unexpected error:

$ v4l2-ctl --get-fmt-vbi-out -d /dev/vbi3
VIDIOC_G_FMT: failed: Invalid argument

FYI - I have 4 VBI devices and I get the same message for all of them.

Kernel seems to recognize the device, not sure what "Alternate settings" 
means.

[255695.468609] cx231xx 2-1.4:1.1: v4l2 driver version 0.0.3
[255695.568600] cx231xx 2-1.4:1.1: Registered video device video4 [v4l2]
[255695.568662] cx231xx 2-1.4:1.1: Registered VBI device vbi3
[255695.568831] cx231xx 2-1.4:1.1: audio EndPoint Addr 0x83, Alternate 
settings: 3
[255695.568834] cx231xx 2-1.4:1.1: video EndPoint Addr 0x84, Alternate 
settings: 5
[255695.568837] cx231xx 2-1.4:1.1: VBI EndPoint Addr 0x85, Alternate 
settings: 2
[255695.568840] cx231xx 2-1.4:1.1: sliced CC EndPoint Addr 0x86, 
Alternate settings: 2

I went down this rabbit hole trying this command to make sure "CC" would 
work:

$ v4l2-ctl -d /dev/vbi3 --set-fmt-sliced-vbi=cc
VIDIOC_S_FMT: failed: Invalid argument

Do I need to get a different device?

Bob


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