[mythtv-users] 16:9 and european sdtv WSS signal

Roger Mårtensson roger.martensson at gmail.com
Sat Aug 14 14:22:51 UTC 2010

  Hi again!

Nick Morrott skrev 2010-07-20 19:30:
> 2010/7/18 Roger Mårtensson<roger.martensson at gmail.com>:
>>   Hi!
>> I have an issue or maybe two and I wonder if it's implemented or not and if
>> it is a know problem.
>> First the WSS signal. I wonder if the internal player is sensitive to the
>> WSS(widescreen) signal? We have a analogue cable the is sending this signal
>> and my TV is acting on it but I can't see myth doing anything about it.
> Roger,
> Can you watch a file recorded with WSS active in a different viewer
> (mplayer/xine/etc) and have the aspect ratio change as you would
> expect it to?
> I record so little analogue video now with my PVR-x50 cards - and that
> I do record is almost all in widescreen - that I have 'forced' the
> video to be recorded with the widescreen flag on. If it does record
> anything that is 4:3, I can adjust the AR during playback.

Had some time(finally) to do some testing. I've tried mplayer/xine and 
it looks they do the same as mythtv does. Showing it with black borders 
in all directions(top/bottom/left/right).

I've tried to see if I could find any software that could check my file 
and tell me the WSS-signal is in there. v4l2-ctl 
--get-fmt-sliced-vbi/-out says it's there including teletext that works 
like a charm.

Tried mythavtest with -v vbi,playback but could not find any messages 
that says anything about what display aspect/fill mode

If I force 16:9 recording it ofcourse looks ok.

>> The second problem I see is when I try to change the aspect ratio from 4:3
>> to 16:9(default it Off) i notice that is changing the size of the picture
>> but only the width. The height stays the same.
> Standard definition analogue PAL video is typically recorded as
> 720x576 for both 4:3 and 16:9 content. The amount of _horizontal_
> stretching determines whether the video is displayed in widescreen or
> not, so I think what you are seeing is normal.
> Cheers,
> Nick

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