Split screen no longer duplicates part of the picture
When Katto stacks two speakers, the two halves could overlap by up to a quarter of the frame, so the same person appeared twice. Measured on 297 split clips: 92 were affected.
When two people sit far apart, Katto cuts the frame into two halves and stacks them. Each half had a cap meant to stop them overlapping, and the cap measured the wrong thing: the distance between the two people, not the width of the picture they both have to fit inside.
On a 1920 wide source each half was 1215 pixels. Two halves of 1215 do not fit in 1920. The windows were then pushed back inside the picture, which pushed them into each other, and up to 508 pixels ended up in both halves at once. On screen that is a person appearing twice, or a body cut at the inner edge of each half.
Measured across 297 split clips already served: 92 of them, 31 percent, were in that state. Up to 340 pixels on a 1280 wide source, which is 27 percent of the width.
Two windows of the same width only fit side by side if each is at most half the picture. That is now the cap, and the two windows are placed so they cannot cross. It only engages when the original placement actually overlaps: an earlier version corrected the geometry in every case and moved seven already-correct clips by one or two pixels, which is not a thing to ship.
Checked by replaying 48 clips with the fix off and on: 45 came out identical, mode and geometry, and the 3 that changed were exactly the 3 that overlapped. Then on a real job: 12 split clips, the cap engaged on 3, none overlapping.
2 videos a month, no card. What is still being built is on the roadmap.