[FFmpeg-user] Region of interest in ISOBMFF?

[David Clemenceau]

I forgot a « ) »:

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

But you cannot use « -c:v copy » since «  Filtering and streamcopy cannot be used together »!

> Le 8 août 2024 à 20:33, Bruce Gavin via ffmpeg-user <ffmpeg-user at ffmpeg.org> a écrit :
> 
> 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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