In my application i try to run avcodec_decode_video and swscale in
parallel.

However, by doing this I get some artifacts in my video, which are not there
when I run these functions synchronously.

I can't see how these two functions are related, which would cause data
races.

Any ideas on what could be causing the artifacts when running in parallel,
and potentially how to get around it?

I don't actually need to scale my video, so maybe img_convert would work
better? Although it is unfortunately deprecated...

Thank you
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