Rhytmic Noise Blasts on audio track when converting from ProRes HQ

Hi there,

I am building a converting service around MediaConvert using boto3 and it mostly runs as expected, returning informative error messages in cases it doesn't. So, firstly - thanks to the AWS engineering team for this piece of solid work, great job! :)

The problem I face has to do with converting a set of ProRes 422 HQ files coming from the outside. No matter how I fiddle with the console settings, and I have been doing it for two days straight, the output's audio track always contains sharp waves of massive noise, hitting in even, ~1sec intervals. No converting errors occurred otherwise.

What I tried:

1. converting files from other sources into ProRes 422 Proxy (my desired format) -> no problem;

2. converting the said, outside ProresHQ files into other formats, like .mp4, with different video & audio codecs, settings. etc. -> the problem remains.

Natural assumption would be that the input files are just broken -- but they're not, as the originals have a regular, audible audio track upon playing.

Check it out: Input, Output

My Example Settings JSON

As an AWS newbie I would really appreciate any hints towards possible source of the problem and provide further info if necessary.

Thanks