bttv driver not initializing properly through V4L compatibility interface in recent kernels (2.6.25/2.6.26)

[david.madsen@…]

After upgrading to recent kernels that have removed V4L I had to switch my bttv card over to use V4L2. Without similar changes to those in the above patch my recordings from that tuner ended up just recording a green screen. It appears to be due to the card/tuner not being initialized fully through the V4L compatibility interface.

[david.madsen@…]

Use V4L2 for bttv

[anonymous]

Bug #1068 from long ago is referring to this issue as well, but I was unable to re-open it.

[PsychoI3oy]

I had the same issue after upgrading and the patch fixed it

[amb@…]

I had the same problem with V4L1 and kernel 2.6.25 and the patch removed that problem.

The patch did however add a new problem which was that individual interlaced fields would appear out of place several frames later than they should have been displayed. This caused frequent jumps in the picture (although they only showed up clearly on fast moving images).

I have no objections to applying the patch, but please don't remove the dead code that is left behind.

[laga@…]

For those using Ubuntu Hardy:

I've uploaded a package which contains a possible fix to the mythbuntu-testing PPA. Version number is 0.21.0+fixes18337-0ubuntu1~ppa4

​https://launchpad.net/~mythbuntu-testing/+archive

[anonymous]

I'm using debian lenny. Which source package do I have to download in order to patch?

[cardoe@…]

Gentoo's patch can be seen at ​http://sources.gentoo.org/viewcvs.py/gentoo-x86/media-tv/mythtv/files/mythtv-0.21-bttv.patch?rev=1.1&view=markup

[saintdev@…]

I'm on Gentoo, and using the above patch does correctly give me video, however, it changes the volume on my card resulting in no audio. As if the "Do not adjust volume" box were unchecked in mythtv-setup.

[amb@…]

Replying to amb@gedanken.demon.co.uk:

I had the same problem with V4L1 and kernel 2.6.25 and the patch removed that problem.

The patch did however add a new problem which was that individual interlaced fields would appear out of place several frames later than they should have been displayed. This caused frequent jumps in the picture (although they only showed up clearly on fast moving images).

With kernel version 2.6.27 this patch works fine for me and the problems I had with 2.6.25 are no longer present.

[scottadmi@…]

I am having the same problem as saintdev under gentoo linux - the video now displays properly using my bttv card - however the card remains muted so no TV audio can be captured and I have been unable to find a way to unmute it via mythtv or the console. At present, I'm forced to downgrade back to the 2.6.24 kernel.

[janne]

(In [19248]) use always V4L2 API if the capture card/driver supports it.

V4L is due to removed from the kernel this month. V4L compat layer will stay around but the V4L2 drivers should been mature enough by now. Refs #5608

[janne]

(In [19249]) backports [19248] from trunk. always use V4L2 if available. Fixes #5608

[janne]

(In [19250]) clean V4L/V4L2 distinction in Nuppelvideorecorder up. Refs #5608