|
It does that because that particular scene is bitrate starved. It typically happens in dark scenes simply because the encoder program tries to save bits on those areas.
You see it more on XVID because when people try to cram a show down to the 170MB sizes and things from a 250-350MB source file, it has to remove data from somewhere.
You'll see it on any encode if they reduce the bitrate enough, or if they don't allocate enough bits to the darker scenes.
On the other hand, it could have been that their raw was shit quality, in which case they couldn't really have done much about it.
|