add -skip_initial_bytes recipe

[privatezero]

Note to self to add something along the lines of:

ffmpeg -skip_initial_bytes 44 -f s24le -ar 96000 -ac 2 -i BAD-WAV -c:a pcm_s24le -ar 96000 -ac 2 -rf64 auto NEW-FILE

for skipping a WAV header and creating a new file from the contained pcm.

Use case here is extracting audio from files that were created by an apparent bug in audacity that allows people to export audio as WAV even if it is too large to fit in WAV. This apparently throws no errors, but creates a jacked up file that isn't fixable with a simple rewrap!

[ablwr]

Note to Andrew

[ablwr]

hi

[privatezero]

I actually have a branch for this like half done - I'll get back to it this week

…

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