Index: DOCS/tech/mpcf.txt
===================================================================
RCS file: /cvsroot/mplayer/main/DOCS/tech/mpcf.txt,v
retrieving revision 1.113
diff -u -r1.113 mpcf.txt
--- DOCS/tech/mpcf.txt	25 Feb 2006 18:51:46 -0000	1.113
+++ DOCS/tech/mpcf.txt	25 Feb 2006 19:41:12 -0000
@@ -640,6 +640,9 @@
 
 chapter_len
     Length of chapter in same timebase of chapter_start.
+    In info streams, if chapter_len is zero, chapter_len is the pts of
+    the first EOR or info frame with a different chapter_id in the same
+    info stream, minus chapter_start.
 
 type
     for example: "UTF8" -> string or "JPEG" -> JPEG image
@@ -741,6 +744,18 @@
 
 Info frames can be used to describe the file or some part of it (chapters)
 
+The pts of an info frame MUST be >=chapter_start and <=chapter_start+len
+(Compared using compare_ts)
+
+Info frames with a different chapter_id (or EOR) MUST NOT appear between
+chapter_start and chapter_start+len. For overlapping chapters several info
+streams can be used.
+
+If an info stream contains an info frame for chapter X then it MUST contain
+an info frame with pts==chapter_start. Due to this restriction, the only
+legal timebase for chapter_start (and chapter_len) is the info stream
+timebase.
+
 Info SHOULD be stored in global packets instead of info streams/frames if
 possible, and the amount of data is not large.