Here's a bit of a noobish question.
With some of the videos I compress, I find that dark scenes tend to come out blocky, whereas the light scenes are coming out good with no blockiness. Now, I think I understand that a dark scene is defined as being particularly low frequency detail. This is when using the default XviD matrix H.263, would I be better off customising a matrix with a higher starting figure then continuing with less of a margin until reaching medium frequency detail for such scenes? ack I hope I'm not coming across as hopeless