[Cin] DAR, PAR and SAR, again

[Andrew Randrianasulu]

On Sun, Jan 21, 2024 at 1:13 PM Andrea paz <gamberucci.andrea at gmail.com> wrote:
>
> I propose two variations to the manual. I also attach the relative
> text if anyone feels like reviewing it.
>
> @Phyllis
> The part about "Aspect ratio (Theory)" I can't reduce it any more than
> that. You choose whether to use all of it or remove the part of the
> Super 35 mm example (from "For example to obtain an aspect ratio of
> Super 35 mmm (2.35)..." to "...1080 - 816 = 264 lines of pixels from
> top and bottom") Or finally, do not update this section. (You will
> have to redo the corrections you had already made...).
>
> @Terje
> For the part on anamorphic video, I have reached an impasse: on some
> definitions of PAR, SAR and DAR but, most importantly, on how CinGG
> works. I will see if I can elaborate further, but for now I do not
> propose an addition to the manual.
>
> @Andrew
> Thanks for the explanations about the code. One question: if all the
> code with sar that I found was added by you, then where do I see how
> ffmpeg works with the aspect ratio?

in thirdparty/ffmpeg-x ? Just grep for 'aspect' :
 grep "aspect" -r thirdparty/ffmpeg/ffmpeg-6.1/libavormat
 grep "aspect" -r thirdparty/ffmpeg/ffmpeg-6.1/libavcodec
 grep "aspect" -r thirdparty/ffmpeg/ffmpeg-6.1