[MPlayer-users] Scaling and expanding when encoding tv

Loren Merritt lorenm at u.washington.edu
Mon Dec 13 23:10:14 CET 2004

On Mon, 13 Dec 2004, Barton Bosch wrote:
> RC wrote:
>> On Sat, 11 Dec 2004, Barton Bosch wrote:
>>> I gather that it is best to keep the w and h dimensions divisible by 16 
>>> and also in a 4:3 ratio.  Which is more important if they are mutually 
>>> exclusive?
>> Multiples of 16 is much more important.  There's really no reason at
>> all to restrict yourself to a 4/3 aspect ratio.
> Ok thanks, I thought that the 4 filters that rescale to 1.33 on playback 
> might lower quality more than doing it during encoding.

Unless your movie is exactly the same resolution as your monitor, it will 
have to rescale during playback anyway. There is no additional penalty for 
correcting aspect ratio at the same time.

For that matter, 4:3 might not actually be the correct aspect ratio of 
your movie. The original broadcast was 4:3 (assuming they got it right). 
But if you crop it, mencoder/lavc's autoaspect should do the right thing 
without any additional overrides.

--Loren Merritt

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