[FFmpeg-cvslog] r9958 - trunk/doc/faq.texi

[michael]

Author: michael
Date: Mon Aug  6 02:19:17 2007
New Revision: 9958

Log:
vbv related questions


Modified:
   trunk/doc/faq.texi

Modified: trunk/doc/faq.texi
==============================================================================
--- trunk/doc/faq.texi	(original)
+++ trunk/doc/faq.texi	Mon Aug  6 02:19:17 2007
@@ -315,6 +315,23 @@ yes, (@url{http://dir.gmane.org/gmane.co
 
 see (@url{http://en.wikipedia.org/wiki/Thread_hijacking})
 
+ at section ffmpeg does not adhere to the -maxrate setting, some frames are bigger than maxrate/fps
+
+Read the mpeg spec, read about video buffer verifer.
+
+ at section I want CBR but no matter what i do frame sizes differ
+
+You do not understand what cbr is, please read the mpeg spec.
+Read about video buffer verifer and constant bitrate.
+The 1 sentence summary is that there is a buffer and the input rate is
+constant, the output can vary as needed.
+
+ at section How do i check if a stream is CBR?
+
+To quote the MPEG-2 spec:
+"There is no way to tell that a bitstream is constant bitrate without
+examining all of the vbv_delay values and making complicated computations."
+
 
 @chapter Development