Same here, email sent. Thank you! Pablo.

Hello, I looked at WebKit code and they have a class to decode VP9 with VideoToolbox, which I used as reference for testing, but the code doesn't work on iOS. Maybe they are only preparing the code for a future update... Even on iOS 14.2 and the latest Xcode Beta, VTIsHardwareDecodeSupported(kCMVideoCodecTypeVP9) is returning false and although CMVideoFormatDescriptionCreate() returns successfully with kCMVideoCodecTypeVP9, VTDecompressionSessionCreate() returns error -12906 which means "could not find decoder". So it looks that either Apple is hiding something or YouTube is using its own software decoder.