[MEncoder-users] Is it possible to make Mencoder encode video file DAR(Display Aspect Ratio) same as ffmpeg does?

[Reimar Döffinger]

On 12 Dec 2012, at 10:53, littlebat <dashing.meng at gmail.com> wrote:

> Hi,
> 
> I have read all parameters in mencoder to deal with DAR of result
> encoded file, but it seems can't set the result video's DAR correctly
> as ffmpeg does. The result file encoded by mencoder has two different
> DAR(detected by ffmpeg -i), but the file encoded by ffmpeg has only one
> DAR value.(also detected by ffmpeg -i).
> 
> So:
> 1, Is it possible to make Mencoder encode video file DAR (Display
> Aspect Ratio) same as ffmpeg does? How to do that?
> 
> 2, What is the difference between the DAR in "[]" and outside "[]" in
> "ffmpeg -i " information? such as:
> Stream #0.0: Video: mpeg4, yuv420p, 176x144 [PAR 12:11 DAR 4:3],
> PAR 1:1 DAR 11:9, 10 fps, 10 tbr, 1k tbn, 10 tbc (default) Stream
> 
> 
> Below is my command line:
> 1, Mencoder
> mencoder \
>  -noconfig all \
>  -ovc lavc \
>  -oac pcm \
>  -lavcopts vcodec=mpeg4:vbitrate=256:aspect=4/3 \

That specifies only the aspect for the encoder, there isn't really a good reason to use that ever.
-aspect or dsize video filter and possibly autoaspect in the encoder options are the only variants that usually make sense.