[FFmpeg-user] Aspect Ratios: DAR, SAR and Frame Size

[Rio Kierkels]

Yes that is what I mean to say. If you don't give it an output resolution
it will keep the input resolution.
But any geometry related operation is done on the aspect ratio corrected
frame.


On 15 January 2014 00:22, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> Rio Kierkels <riokierkels <at> gmail.com> writes:
>
> > The way I think ffmpeg uses DAR and SAR on decode (and
> > this is where I base all my other code around ffmpeg on)
> > is that when you have a typical anamorphic DV source
> > which is 720x576 on disk but has a display aspect ratio
> > of 16:9 it first unsqueezes the footage until the
> > resolution reaches the DAR target of 16:9. In this case
> > that would be 1024x576. Then it applies all it's magic
> > to that frame size and on ouput if the output display
> > aspect ratio is equivalent of the current frame aspect
> > ratio it will set the DAR to 1.
>
> To the best of my knowledge, this is not what FFmpeg does
> by default.
> On the contrary, it will be default not change the
> resolution (which is 720x576 in your example).
>
> Carl Eugen
>
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