Author: ods15
Date: Sat Oct 28 21:27:00 2006
New Revision: 169
Modified:
trunk/docs/nut-english.txt
Log:
I'm too lazy to explain seeking again 
Modified: trunk/docs/nut-english.txt
============================================================
==================
--- trunk/docs/nut-english.txt (original)
+++ trunk/docs/nut-english.txt Sat Oct 28 21:27:00 2006
 -246,7
+246,14
to reset the last_pts context of all streams, and to find
the appropriate
syncpoint when seeking. Demuxing can only begin at
syncpoints for proper
last_pts context across all streams, including after
seeking.
-back_ptr is explained in greater detail in the Seeking
section.
+A back_ptr points to a previous syncpoint in the file. The
area between
+the previous syncpoint and this one must contain a keyframe
for every
+stream, with a pts lower than or equal to the timestamp of
this syncpoint.
+This back_ptr is used for optimal seeking in files without
an index.
+For compression, the back_ptr is relative to this
syncpoint, and is
+divided by 16. The reason for this is that the minimum size
for a
+syncpoint is 16 bytes:
+8 startcode + 1 forward_ptr + 1 timestamp + 1 back_ptr + 4
checksum + 1 frame_code
Error Checking
-280,3
+287,8
closest syncpoint startcode found, and resume demuxing from
there. If
possible, before the linear search, rewind to the last
syncpoint seen, in
case a syncpoint was already skipped due to demuxing
damaged data.
+
+Seeking
+
+An in depth explanation of an optimal seeking algorithm can
be found in
+http://
wiki.multimedia.cx/index.php?title=NUT
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