In that case the ads are video only, no clicking on them, including to skip or anything else. So it would be detecting that trying to change where you are in the video doesn’t change anything (and exclusively playing via your 3 second buffer)

The problem is that Microsoft wants to pay that for a permanent “never maintain in a way that breaks caption decoding in any default behaviour we use” with that one time payment.

Its a quick fix on Microsofts end to change a quick flag in ffmpeg. It’s also quick on their end to maintain a fork that only changes the default. One time payments for maintenance make open source projects like ffmpeg subject to fail.

Hilariously the issue was just a setting change in the update, that you can easily change via a command option. They saw thing didn’t work, and didn’t read the change log at all before asking to pay a one time fee to guarantee it be maintained for them.