What is "Number of Slices"

geekazine wrote on 2/23/2014, 2:39 PM

I have been looking on the site everywhere. There is no definition of what the "Number of Slices" does in the Render - MainConcept AVC/AAC settings.

Comments

musicvid10 wrote on 2/23/2014, 3:53 PM

It's nothing you or I need to fret over; absolutely leave it at the default because motion prediction in Mainconcept is already optimized for both speed and accuracy..

"In the latest international standard, known as H.264/MPEG-4 AVC, the granularity of the establishment of prediction types is brought down to a lower level called the slice level of the representation. A slice is a spatially distinct region of a frame that is encoded separately from any other region in the same frame. In that standard, instead of I-frames, P-frames, and B-frames, there are I-slices, P-slices, and B-slices."

musicvid10 wrote on 2/23/2014, 7:55 PM

That's an oversimplification; slices should be left at their defaults to keep from messing with interframe motion prediction, an important consideration with b-frames.

They are "not" player-dependent, except that a few much older devices (the first gen iPod) don't support b-slices at all. For those devices, only Baseline Profile should be used. Hope that clears it up for you.

wilri001 wrote on 8/13/2017, 2:35 PM

Perhaps the quality suffers due to independent rendering, but my AMD 8350 8 processing streams processor runs at 67% at 8 slices, vs 50% at 1 slice, with like reduction in elapsed time (at least with Sony's CODEC).