[Ffmpeg-devel] [PATCH] from DivX, Part 4: LAME ABR encoding

[Steve Lhomme]

Provided some containers may not like non-CBR codecs, it's safer to make 
it optional.

Rich Felker wrote:
> On Fri, Dec 16, 2005 at 11:34:11AM -1000, Steve Lhomme wrote:
> 
>>As the name suggests, this adds a flag to FFMPEG to allow Average 
>>Bitrate encoding using LAME.
> 
> 
>>Index: libavcodec/avcodec.h
>>===================================================================
>>RCS file: /cvsroot/ffmpeg/ffmpeg/libavcodec/avcodec.h,v
>>retrieving revision 1.430
>>diff -u -r1.430 avcodec.h
>>--- libavcodec/avcodec.h	9 Dec 2005 16:08:18 -0000	1.430
>>+++ libavcodec/avcodec.h	16 Dec 2005 21:30:04 -0000
>>@@ -320,6 +320,7 @@
>> 
>> #define CODEC_FLAG_QSCALE 0x0002  ///< use fixed qscale 
>> #define CODEC_FLAG_4MV    0x0004  ///< 4 MV per MB allowed / Advanced prediction for H263
>>+#define CODEC_FLAG_ABR    0x0008  ///< use ABR mode (DivX Inc)
> 
> 
> Is this really necessary? IMO lavc should always be in 'abr' mode
> unless minrate/maxrate are set (cbr) or constant quality (vbr) is
> set...
> 
> Rich
> 
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