Hi,
On Mon 12 May 2025 at 11:01, Christian Sievers via ffmpeg-user < ffmpeg-user@ffmpeg.org> wrote: > Hello, > > We would like to transcode v210 (uncompressed 8 bit 4:2:2 PAL) Quicktime > mov video files to FFV1/MKV for archival purposes. > > ffmpeg crops these files, using Quicktime's CLAP atom (clean aperture > value). We would like to preserve the full 720 pixel width. How can I do > that? > As others have mentioned, this isn’t a true crop but a metadata value that tells a player to perform a crop. From previous experience, QuickTime Player was the only tool that obeyed this cropping and VLC ignored it but that may have changed subsequently. > I'm using this standard command: > ffmpeg -i input_file -map 0 -dn -c:v ffv1 -level 3 -g 1 -slicecrc 1 > -slices 16 -c:a copy output_file.mkv Out of curiosity, are you performing any listlessness checks? That would also give you some comfort that a true cropping hasn’t been done. > > FYI > MediaInfo reports this about the original Quicktime file: > Width : 720 pixels > Clean aperture width : 703 pixels > Height : 576 pixels > Clean aperture height : 576 pixels > Display aspect ratio : 4:3 > Clean aperture display aspect ratio : 4:3 > > and this about the resulting MKV: > Width : 702 pixels > Height : 576 pixels > Display aspect ratio : 4:3 Does mediainfo not have additional values for width, perhaps “Original_Width” or something? I’d be surprised if it also didn’t have a value for 720 but you may need to add a more verbose flag for mediainfo to display it. Best, Kieran _______________________________________________ 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".
