[FFmpeg-user] Region of interest in ISOBMFF?

[Bruce Gavin]

 Thanks for the great tip.
Much appreciated.
If this works, it is exactly what I am searching for.

I'm having an invalid argument error.
Please take a peek at the command line below, see if you can spot where I went wrong.
My screen resolution is 3840:2160.

ffmpeg -y -hide_banner -i 20000_LEAGUES_SPECIAL_PASSTHROUGH.mkv -c:v copy -c:a copy -c:s copy 20000_LEAGUES_SPECIAL_PASSTHROUGH.PAD.mkv -filter:pad=3840:2160:max(0\,(3840-iw)/2):max(0\,(2160-ih)/2 



    On Thursday, August 8, 2024 at 10:16:21 AM PDT, David Clemenceau <david.clemenceau at ubikamedia.com> wrote:  
 
 Hi Bruce,

It should work with the following filter:

pad=4096:2160:max(0\,(4096-iw)/2):max(0\,(2160-ih)/2

(replace by 3840:2160 if you’re talking about UHD).

David

> Le 8 août 2024 à 17:58, Bruce Gavin via ffmpeg-user <ffmpeg-user at ffmpeg.org> a écrit :
> 
> I have an interest in this as well.
> I would like to embed a 480p video frame into the center of a black 4k video frame.
> The intent is presenting 4k to a 4k TV set and avoid upscaling.
> 
> Most TV do a terrible job of upscaling low res 480P, either DVD or over the air.
> This would present a small image in the center of the 4k screen, but without the upscaling degradation of quality.
> 
> Q:  is this possible, theory or practice?
> 
>    On Thursday, August 8, 2024 at 04:17:38 AM PDT, Phil Rhodes via ffmpeg-user <ffmpeg-user at ffmpeg.org> wrote:  
> 
> Hello
> This is not directly an ffmpeg question, but this seemed like a reasonable place to ask.
> Is there any common approach to encoding a region of interest - that is, a rectangular area of the frame - as metadata into an ISOBMFF, that is, essentially a QuickTime or MP4 movie file?
> I'm aware that some approaches to this have been invented for various applications, but not if there is any widely-recognised standard for it.
> P
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