[Libav-user] Preserve aspect ration while using sws_scale() API

[rohit khali]

Thanks a lot for the response!

Yes, I too narrowed down on the same in the end and it works well.

Actually I had filter graphs(scale) wandering in mind and question was
derived in that context. Later I realised no point in complicating things
in this case.

Regards,
Rohit Khali
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