[linux-dvb] Hauppauge PVR-150 Vertical sync issue?

Robert Longfield robert.longfield at gmail.com
Fri Dec 18 21:24:21 CET 2009


Hey Barry,

Well that is certainly could be part of the problem, I was using
mplayer to play back the video recorded onto the computer monitor.
I wasn't too overly concerned with it as I thought it might be a playback issue.
I certainly have a lot more trouble shooting to do before I figure out
where the issue lies with this hardware.

-Rob

On Fri, Dec 18, 2009 at 3:17 PM, BOUWSMA Barry
<freebeer.bouwsma at gmail.com> wrote:
> On Fri, 18 Dec 2009, Robert Longfield wrote:
>
>> Ok so I ran a live CD on my windows box and there were no sync
>> problems. I installed the latest Ubuntu CD and dual booted my windows
>> machine and there was no sync problems but there was other issues,
>> many tiny black lines on edges during fast movement when I did a $ cat
>> /dev/video0 > foo.mpg.
>
> This sounds like an interlacing issue -- I suspect you are using
> some player that delivers 25 full frames per second to your
> display instead of somehow getting 50 partial fields from them
> or interpolating the fields into 50 frames per second.
>
> This is fairly normal when not dealing with progressive material
> (720p HD video, or 1080i HD or even SD video taken from source
> material such as film shot at 24 fps).  Most players have options
> to enable one of any number of deinterlacers, some of which work
> better than others for selected movement.  (There are many
> different commandline options for `mplayer', one of which will
> present the fields of a 576i video as 288-line images which helps
> decipher fast-scrolling text, for example.)
>
> If you are reproducing your video at your display's native
> resolution without zooming it to fullscreen, you can see each
> of the jagged lines matching one pixel vertical resolution.
>
>
> barrry bouwsma
>



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