[FFmpeg-cvslog] Insert setdar at the begin of a filter chain instead the end.

[Stefano Sabatini]

On date Friday 2011-04-01 02:29:34 +0200, Michael Niedermayer wrote:
> ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Fri Apr  1 02:13:51 2011 +0200| [859676dd426e7051b41b174886e6e64271e93cdc] | committer: Michael Niedermayer
> 
> Insert setdar at the begin of a filter chain instead the end.
> This fixes -vf setsar

What is this exactly fixing?

And setting the filter at the begin of the filterchain won't allow to
set the filterchain output DAR, as the filterchain may insert other
setdar/setsar filters and/or rescale the input video.

Also there is the problem in the case "[in]" is specified at the begin
of the user-specified filtergraph description, which will cause a
syntax error.