[MPlayer-users] loosing part of the picture with resizing?

[Krzysztof Duchnowski]

Bernd Butscheidt pisze:

> But I am still confused:

> - Why do I need the video filter expand on top? Leaving it out leads to 
> the resolution 720*406 (using 720:-2) or 720*400 (using 720:-10).
> Using the expand filter on top leads to a resolution of 736*416.

Some encoders like it to be multiple of 16 or 8 - read about desired 
encoder and it's limitations ( AVC *likes* dimension to be a multiple of 
16 where MPEG2 *needs* it to be multiple of 16 - macroblock 16x16 )


> - I would have expected to use "-vf scale=720:-3" or "-vf scale=720:-11" 
> to use the original aspect ratio instead of the "prescaled" (I tried it, 
> the resolution doesen't change again and stays at 720*576 although 
> mencoder recognizes it as 16:9). Where is the aspect ratio prescaled?

Maybe "prescaled" means scale to square pixels where "original"is to 
preserve anamorphic pixels...
In the example maybe it will be a better option to expand without given 
aspect:

"-vf scale=720:-2,expand=::::::16"

-- 
Krzysztof 'DK75' Duchnowski
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