[NUT-devel] r20982 - trunk/DOCS/tech/nut.txt

[michael]

Author: michael
Date: Fri Nov 17 14:32:45 2006
New Revision: 20982

Modified:
   trunk/DOCS/tech/nut.txt

Log:
clarify syncpoint placement recommanditions
(note i would also like to add a "there MUST be 1 syncpoint per second" rule)


Modified: trunk/DOCS/tech/nut.txt
==============================================================================
--- trunk/DOCS/tech/nut.txt	(original)
+++ trunk/DOCS/tech/nut.txt	Fri Nov 17 14:32:45 2006
@@ -920,9 +920,19 @@
 
 Note, more complicated seeking methods exist which are capable of quickly
 seeking to the optimal point in the presence of an index even if only a
-subset of all streams are active but a muxer SHOULD place syncpoints,
-and keyframes if it can affect the placement of keyframes so that simple
-low complexity seeking works with fine granularity
+subset of all streams is active
+
+A muxer SHOULD place syncpoints so that that simple low complexity seeking
+works with fine granularity, that is syncpoints should be placed prior
+to keyframes instead of non keyframes and with high enough frequency 
+(once per second unless there are no keyframes between this and the previous
+syncpoint)
+
+encoders SHOULD place keyframes so that the number of points where all
+streams have a keyframe at the same time is maximized, this ensures that
+seeking (complicated or not) does not need to demux and decode significant
+amounts of data to reach a point where a presentable frame for each stream
+is available after seeking
 
 
 Semantic requirements: