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-rw-r--r--DOCS/tech/nut.txt9
1 files changed, 5 insertions, 4 deletions
diff --git a/DOCS/tech/nut.txt b/DOCS/tech/nut.txt
index e267ac0318..afef7945ba 100644
--- a/DOCS/tech/nut.txt
+++ b/DOCS/tech/nut.txt
@@ -736,10 +736,11 @@ Syncpoint tags:
back_ptr_div16 (v)
back_ptr = back_ptr_div16 * 16 + 15
- back_ptr must point to a position within 16 bytes of a syncpoint
- startcode. This syncpoint MUST be the closest syncpoint such that at
- least one keyframe with a pts lower or equal to the original syncpoint's
- global_key_pts for all streams lies between it and the current syncpoint.
+ back_ptr must point to a position up to 15 bytes before a syncpoint
+ startcode. Relative to position of current syncpoint. The syncpoint
+ pointed to MUST be the closest syncpoint such that at least one keyframe
+ with a pts lower or equal to the current syncpoint's global_key_pts for
+ all streams lies between it and the current syncpoint.
A stream where EOR is set is to be ignored for back_ptr.