чт, 8 авг. 2024 г., 21:34 Bruce Gavin via ffmpeg-user < ffmpeg-user@ffmpeg.org>:
> 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 may be add ')' at very end so it will be two curly brackets opening, two closing for max() equation ? > > > > On Thursday, August 8, 2024 at 10:16:21 AM PDT, David Clemenceau < > david.clemenc...@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@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@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 > > _______________________________________________ > > ffmpeg-user mailing list > > ffmpeg-user@ffmpeg.org > > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > To unsubscribe, visit link above, or email > > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > > > > _______________________________________________ > > ffmpeg-user mailing list > > ffmpeg-user@ffmpeg.org > > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > To unsubscribe, visit link above, or email > > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
