On Tue, Jul 15, 2025 at 6:00 PM Mark Filipak <markfilipak.i...@gmail.com> wrote:
> Are these correct? Or, is there some official reference I can consult? > Maybe correct for packed formats only. > --Mark. > > KEY: > ¤ —— Element exists in the field and is sampled > • —— Element exists in the field but is not sampled > —— (blank) Element doesn't exist in the field > > Reference: https://en.wikipedia.org/wiki/Chroma_subsampling Isn't this very obvious and straightforward read? Also you forgot that chroma, when subsampled, can have different positions, top, top-left, center, .. > > > Y element, pixels 0..3 > / Cb element, pixels 0..3 > / / Cr element, pixels 0..3 > / / / > 4:4:4 ¤¤¤¤ ¤¤¤¤ ¤¤¤¤ —— lines in field 0 > ¤¤¤¤ ¤¤¤¤ ¤¤¤¤ —— lines in field 1 > > 4:4:2 ¤¤¤¤ ¤¤¤¤ ¤¤¤¤ > ¤¤¤¤ ¤•¤• ¤•¤• > > 4:4:2 ¤¤¤¤ ¤¤¤¤ ¤¤¤¤ // JPEG variant according to the reference > ¤¤¤¤ ¤¤¤¤ > > 4:4:1 ¤¤¤¤ ¤¤¤¤ ¤¤¤¤ > ¤¤¤¤ ¤••• ¤••• > > 4:4:0 ¤¤¤¤ ¤¤¤¤ ¤¤¤¤ > ¤¤¤¤ > > 4:2:2 ¤¤¤¤ ¤•¤• ¤•¤• > ¤¤¤¤ ¤•¤• ¤•¤• > > 4:2:1 ¤¤¤¤ ¤•¤• ¤•¤• > ¤¤¤¤ ¤••• ¤••• > > 4:2:1 ¤¤¤¤ ¤•¤• ¤•¤• // JPEG variant according to the reference > ¤¤¤¤ ¤••• > > 4:2:0 ¤¤¤¤ ¤•¤• ¤•¤• > ¤¤¤¤ > > 4:1:1 ¤¤¤¤ ¤••• ¤••• > ¤¤¤¤ ¤••• ¤••• > > 4:1:0 ¤¤¤¤ ¤••• ¤••• > ¤¤¤¤ > > 4:0:0 ¤¤¤¤ // My conjecture > ¤¤¤¤ > > 3:1:1 ¤¤¤ ¤•• ¤•• // Sony variant according to the reference > ¤¤¤ ¤•• ¤•• > _______________________________________________ > 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".
