[FFmpeg-user] Region of interest in ISOBMFF?

[Phil Rhodes]

 That's not quite what I had in mind - I think you're just talking about padding a video to a larger size.
I'm picturing the opposite. The application in my case would be to shoot with a camera having larger resolution than the final deliverable, and to have a ROI in that larger frame used in all cases other than when I might want some extra picture, such as when performing stabilisation.
- P
    On Thursday 8 August 2024 at 16:59:15 BST, Bruce Gavin via ffmpeg-user <ffmpeg-user at ffmpeg.org> wrote:  
 
  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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