ffmpeg on alpine 3.16

i just updated my version of alpine linux to 3.16 and i installed ffmpeg, but, when i try to run it, it returns a bad system call

the output when i run dmesg is
`13(ffmpeg) missing syscall 275`

Reproduce the failure on Alpine Linux 3.16 by running ffmpeg and checking dmesg for the missing syscall 275. Then locate the syscall-handling entry point in the iSH source and determine how this unsupported call should be handled; the issue names no file, test, or definite completion criteria.

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