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[ffmpeg] / doc / faq.texi

diff --git a/doc/faq.texi b/doc/faq.texi
index 0cafd2faf455c5a8449ff0ff2a0603a62d79a5e0..8ace580f4f96723ea4783afe3edcbc11b1594e3f 100644 (file)
--- a/doc/faq.texi
+++ b/doc/faq.texi
@@ -151,7 +151,7 @@ Choose a different codec with the -vcodec command line option.
 @section ffmpeg does not work; What is wrong?
 
 Try a 'make distclean' in the ffmpeg source directory before the build. If this does not help see
-(@url{http://ffmpeg.org/bugreports.php}).
+(@url{http://ffmpeg.org/bugreports.html}).
 
 @section How do I encode XviD or DivX video with ffmpeg?
 
@@ -307,6 +307,28 @@ ffmpeg -f u16le -acodec pcm_s16le -ac 2 -ar 44100 -i all.a \
 rm temp[12].[av] all.[av]
 @end example
 
+@section Is there a forum for FFmpeg? I do not like mailing lists.
+
+Yes, (@url{http://dir.gmane.org/gmane.comp.video.ffmpeg.user}).
+
+@section FFmpeg does not adhere to the -maxrate setting, some frames are bigger than maxrate/fps.
+
+Read the MPEG spec about video buffer verifier.
+
+@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 verifier and constant bitrate.
+The one sentence summary is that there is a buffer and the input rate is
+constant, the output can vary as needed.
+
+@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
 
 @section When will the next FFmpeg version be released? / Why are FFmpeg releases so few and far between?
@@ -330,7 +352,7 @@ it implemented is to undertake the task yourself.
 
 Yes. Read the Developers Guide of the FFmpeg documentation. Alternatively,
 examine the source code for one of the many open source projects that
-already incorporate ffmpeg at (@url{projects.php}).
+already incorporate ffmpeg at (@url{projects.html}).
 
 @section Can you support my C compiler XXX?
 
@@ -338,29 +360,29 @@ It depends. If your compiler is C99-compliant, then patches to support
 it are likely to be welcome if they do not pollute the source code
 with @code{#ifdef}s related to the compiler.
 
-@section Visual C++ produces many errors.
+@section Microsoft Visual C++ produces many errors.
 
-Visual C++ is not compliant to the C standard and does not support
+Microsoft Visual C++ is not compliant to the C standard and does not support
 the inline assembly used in FFmpeg.
-If you wish - for whatever weird reason - to use Visual C++ for your
-project then you can link the Visual C++ code with libav* as long as
+If you wish - for whatever weird reason - to use MSVC++ for your
+project then you can link the MSVC++ code with libav* as long as
 you compile the latter with a working C compiler. For more information, see
-the @emph{Visual C++ compatibility} section in the FFmpeg documentation.
+the @emph{Microsoft Visual C++ compatibility} section in the FFmpeg
+documentation.
 
-There have been efforts to make FFmpeg compatible with Visual C++ in the
+There have been efforts to make FFmpeg compatible with MSVC++ in the
 past. However, they have all been rejected as too intrusive, especially
 since MinGW does the job perfectly adequately. None of the core developers
-work with Visual C++ and thus this item is low priority. Should you find
+work with MSVC++ and thus this item is low priority. Should you find
 the silver bullet that solves this problem, feel free to shoot it at us.
 
 @section Can I use FFmpeg or libavcodec under Windows?
 
-Yes, but the MinGW tools @emph{must} be used to compile FFmpeg. You
-can link the resulting DLLs with any other Windows program. Read the
-@emph{Native Windows Compilation} and @emph{Visual C++ compatibility}
-sections in the FFmpeg documentation to find more information.
+Yes, but the Cygwin or MinGW tools @emph{must} be used to compile FFmpeg.
+Read the @emph{Windows} section in the FFmpeg documentation to find more
+information.
 
-To get help and instructions for using FFmpeg under Windows, check out
+To get help and instructions for building FFmpeg under Windows, check out
 the FFmpeg Windows Help Forum at
 @url{http://arrozcru.no-ip.org/ffmpeg/}.
 
@@ -412,6 +434,10 @@ and libmpdemux/demux_lavf.c in MPlayer sources.
 
 The standard MSys bash (2.04) is broken. You need to install 2.05 or later.
 
+@section I get "./configure: line <xxx>: pr: command not found" in MSys.
+
+The standard MSys install doesn't come with pr. You need to get it from the coreutils package.
+
 @section I tried to pass RTP packets into a decoder, but it doesn't work.
 
 RTP is a container format like any other, you must first depacketize the
@@ -425,10 +451,18 @@ see @url{http://www.iversenit.dk/dev/ffmpeg-headers/}
 
 see @url{http://svn.mplayerhq.hu/michael/trunk/docs/}
 
-@section how do I feed H.263-RTP (and other codecs in RTP) to libavcodec?
+@section How do I feed H.263-RTP (and other codecs in RTP) to libavcodec?
 
 Even if peculiar since it is network oriented, RTP is a container like any
 other. You have to @emph{demux} RTP before feeding the payload to libavcodec.
 In this specific case please look at RFC 4629 to see how it should be done.
 
+@section AVStream.r_frame_rate is wrong, it is much larger than the framerate.
+
+r_frame_rate is NOT the average framerate, it is the smallest framerate
+that can accurately represent all timestamps. So no, it is not
+wrong if it is larger than the average!
+For example, if you have mixed 25 and 30 fps content, then r_frame_rate
+will be 150.
+
 @bye