The set bitrate is not respected when kVTCompressionPropertyKey_AverageBitRate is used. constant and variable bitrates seems to work, only average that is broken. All three modes works in iOS 26.
kVTCompressionPropertyKey_AverageBitRate seems to be broken in iOS 27 Beta
Thank you for reporting this issue. Could you provide more details about what you’re experiencing and clarify what you mean by kVTCompressionPropertyKey_AverageBitRate being broken?
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I submitted using the Feedback app a few days ago, but it seems you guys at Apple never respond to those. I have submitted three, and none has been addressed.
I'll not submit more details as it taks lots of effort, and I doubt you'll look at it, sorry.
Here is my project: https://github.com/eerimoq/moblin