Re: [BTTV] [FSL P50x0] [PASEMI] TV Time doesn't work anymore after dropping the overlay support

[Christian Zigotzky <chzigotzky@xenosoft.de>]

On 10 September 2023 at 04:33 am, Deborah Brouwer wrote:
 >
 > This is not debug code.  I made the change to fix the latency and
 > frame drop issues
 > that were otherwise occurring with vb2; as I said in the cover letter 
to v3:
 >
 > "- remove the last four lines in interlaced,
 > sequential top/bottom, and alternating buffers
 > to prevent long latency and frame drops
 > (this is instead of just enabling the existing
 > VCR hack by default);"
 > 
https://lore.kernel.org/linux-media/cover.1689379982.git.deborah.brouwer@collabora.com/
 >
 > However, if your testing shows that it isn't needed, then it would be
 > fine to remove this
 > code and just let the user enable the "vcr hack" as needed. This was
 > my original approach
 > in v2, but I thought you had said at the time that you were seeing
 > massive framedrops in v2?
 >
 > I didn't notice this green line before because I was testing in qv4l2
 > with the default
 > Pixel Format  : 'BGR3' (24-bit BGR 8-8-8) whereas tvtime is using
 > YUYV' (YUYV 4:2:2)
 >
 > One fix that worked for me was to adjust the "OverScan" configuration 
in tvtime
 > so that it is at least 3.5.  The /etc/tvtime/tvtime.xml configuration
 > file recommends
 > even higher at 8.0.  Christian, please try adjusting the overscan
 > value to see if
 > that is a possible solution as well.
 >
 > Thanks,
 > Deb

Hi Deb,

It works! :-)

I adjusted the OverScan configuration to 3.5 today (.tvtime/tvtime.xml) 
and this solved this issue.

Thanks a lot!

Cheers,
Christian