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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