[FFmpeg-devel] [PATCH] avcodec/nvenc: De-compensate aspect ratio compensation of DVD-like content.

[Philip Langdale]

On Thu, 29 Jan 2015 01:38:31 +0000
Kieran Kunhya <kierank at obe.tv> wrote:

> > this context, that means that they make the following, questionable,
> > assumptions:
> 
> erm
> 
> > 1) If the input dimensions are 720x480 or 720x576, assume the
> > content has an active area of 704x480 or 704x576.
> 
> 702x576

That may be what bt.601 says (I haven't read it, I don't know), but the
45/44 scale factor that they apply is certainly from 720/704. And I've
seen 704 mentioned as the active width in may discussions. But that's
neither here nor there - they do a 45/44 adjustment.

--phil