I realise now that these are the four sync audio channels of the clip.
This is normal behavior for DNxHD exports?
I’ve previously only done ProRes transcodes so this seriously freaked me out!
Thanks for your extensive reply Philip!
I think I’ll go that route for the final version.
Luckily youtube’s compression hid the digital rain a little for the competition submission of my film.
Here’s the short in all it’s dodgy video glory. https://www.youtube.com/watch?v=SALITAYreQE
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Thanks for the reply. The problem appeared with and without the grade.
I just imported the completed Premiere CS6 project into CS5 and exported from there.
No ‘digital rain’ to be seen. Clearly an issue with Premiere CS6 or the encoder it uses.