SLURM improvments, audio fixes

[iejMac]

I need to fix tests, they are tweaking. LGTM, let me know if this is good to merge and thanks!

[m-bain]

Just added some patch to get audio sub sampling (& converting format) working. Btw This repo so helpful for making video webdatasets thank you jeez

[iejMac]

glad its getting some use! if you could update the test_audio_subsampler unit test (update the call in there since you changed the func signature) we can merge this! thanks for contributing

[m-bain]

@iejMac ok updated the tests. Also added optional TEST_ARGS to the make test in case just wanting to run a specific subset of tests

[iejMac]

great! LGTM, thanks