[FFmpeg-user] ffmpeg-2.1 + setsar + setdar question

[Tom Evans]

On Thu, Oct 31, 2013 at 4:07 PM, David Favor <david at davidfavor.com> wrote:
>>> David-Favor-iMac# ffmpeg -y -i broken.mp4 -c:a copy -c:v libx264 -crf 20
>>> -preset:v veryfast -vf setsar=sar=0 -vf setdar=dar=0 -t 10 test.mp4
>>
>>
>>> David-Favor-iMac# ffmpeg -y -i broken.mp4 -c:a copy -c:v libx264 -crf 20
>>> -preset:v veryfast -vf setdar=dar=0 -vf setsar=sar=0 -t 10 test.mp4
>
>
> This produces DAR 360:203 instead of DAR 720:406
>

Am I being dense? What is the difference between 360/203 and 720/406?

Cheers

Tom