I am in no way an expert on this topic. This is one of those topics that can very quickly take you down the rabbit hole into an incredibly complex world of discussion.
Blue sky is one of the most difficult things for any video codec to render, due to the continual/gradual colour shift.
Video codecs like Mainconcept AVC, group blocks of pixels together when compressing the video, to keep the file size under control, but this also has a negative effect on certain subjects. Most video that comes out of consumer grade cameras, only uses 8 bit 4:2:0 colour space - which is more susceptible to banding. Professionals use cameras that output to much higher value colour spaces like 4:2:2 and 4:4:4, which can handle blue sky encoding much better.
Here is a great video that explains part of the problem.
Simple answers
If using Mainconcept AVC/AAC, turn on
Two Pass Rendering and the
De-Blocking Filter.
Try a different codec to render with, that uses a higher Bit Rate, like the
Sony XAVC profiles.
Transcode your videos into a lossless format like
Avid DNxHD, before you import into Vegas/Movie Studio. This un-locks your videos and helps them not break apart while editing. When it comes time for rendering, they should hold up better. Go Pro has the free
Go Pro Studio software you can use to convert all videos to
Cineform, which is also another lossless format. Apple users convert to Apple ProRes.
John Rofrano has a great tutorial which explains how to encode video to Avid DNxHD in the Sony Vegas/Movie Studio environment.
johnrofrano.com/training/video-tutorials/avid-dnxhd-template-for-vegas-pro/
Regards
Derek.
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