Can ffmpeg leverage iphone's hardware enocder/decoder? Not talking about gpu acceleration which ffmpeg can already acheive. We all know that apple's VideoToolBox leverages iphone's hardware codec.

Does iOS camera app use VideoToolBox framework's method e.g. VTCompressionSessionEncodeFrame() for encoding? Or has apple their own separate APIs apart from open APIs available for 3rd party developers in VideoToolBox?

How can we use iOS system "software encoder" API? We leveraged ffmpeg software encoder. Also used iOS videotoolbox hardware encoder. How can we use software encoder API of iOS system?

When my video player app goes to background, is there any way to preserve decoder session so that I can resume the player Item whenever I want?

If multiple apps or single app attempts to decode multiple video files, what is the maximum limit of files a decoder can decode simultaneously?

Android App Resource Priority scheme: System app (higher) > Foreground status app > Background status app (lower). What is the priority scheme for iOS apps in above context?

Is iPad 9th generation is stage manager compatible? Where can I get this compatibility list?