Try some experiments with mplayer first.  I know this is not what you
want, but it will help to see what's happening to the stream.  Do a
720x576 capture into a file with the video_aspect set to 4:3.  Now do
another capture into another file with the video aspect set to 16:9.
Play back each with mplayer.  You should see mplayer sizing the frame
correctly for the aspect ratio in each case.  I know this works - I've
done it (actually I've even done this mid-stream and mplayer still gets
it right).  But if it isn't working for you here with mplayer then we
need to investigate a problem with the driver or how you're using it.

Mplayer, Xine and MythTV show the right 4:3 or 16:9 frame, so this is working.

If it *does* work, then we know that you're getting a properly formatted stream. So next I'd look at your playback app. If the app isn't paying
attention to the embedded aspect ratio info, then let's hope there's a
way to manually set that within the app - perhaps there's another way to tell the app that your pixels aren't actually square. What app is this? If you can't find a way to set the desired aspect ratio from within the
app, then the only option I think you have left is to try changing the
capture resolution so that the pixels are in fact square again.
(Actually if the app really is assuming square pixels, then 720x576
already isn't 4:3 - it's 5:4.)


The stream is technically perfect, if it's recorded in 4:3 all apps (and also my TV) show it in 4:3, it it's recorded in 16:9 in 16:9.
The real problem are the black borders and the image stretching.
Maybe I should not have mentioned the capure resolution but better that I'm living in a PAL country. As far as I know the pvrusb2 module does not know wide screen signalling (WSS), so I hoped to get rid of the black bars by setting pvrusb2 manually to 16:9. As long as I have set pvrusb2's aspect ratio setting to 4:3, everything looks fine: No picture deformation, and black bars at the top and the bottom if the content is in 16:9. If I set pvrusb2 to 16:9, the mpeg stream's aspect ratio is correctly set to 16:9, the 4:3 picture is taken (including the black bars at top and bottom) and, by the 16:9 flag in the stream, simply stretched horizontaly - instead of just recording the middle of the picture.

Bernhard

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