Re: keeping bitrate during conversion

astrograph GMX wrote:
> Michel Bardiaux wrote:
>
> > astrograph GMX wrote:
> >
> > > hi,
> > >
> > > I am trying to convert .mp4 videos to .3gp, it works, but there is a 
> > > big difference in bitrate between the original and the converted copy:
> > >
> > > ffmpeg -i media/470222.mp4 test3.3gp
> > > ffmpeg version 0.4.9-pre1, build 4718, Copyright (c) 2000-2004 
> > > Fabrice Bellard
> > >   built on Feb 28 2005 14:45:40, gcc: 3.2.3 20030502 (Red Hat Linux 
> > > 3.2.3-49)
> >
> >
> > This is very old. Please upgrade to CVS.
>
>
> thank you for your quick response!! yes, I am aware of that, I ran into 
> the problem that I wasn´t able to compile the current version of ffmpeg:
>
> ]$ make
> make -C libavutil all
> make[1]: Entering directory 
> `/opt/qpass/mediaconverter/tools/ffmpeg/libavutil'
> gcc -O3 -g -Wall -Wno-switch  -Wdeclaration-after-statement 
> -DHAVE_AV_CONFIG_H -DBUILD_AVUTIL -I.. -D_FILE_OFFSET_BITS=64 
> -D_LARGEFILE_SOURCE -D_GNU_SOURCE  -c -o mathematics.o mathematics.c
> In file included from mathematics.c:24:
> common.h:608: warning: static declaration of 'lrintf' follows non-static 
> declaration
> mathematics.c:132:7: warning: no newline at end of file
> gcc -O3 -g -Wall -Wno-switch  -Wdeclaration-after-statement 
> -DHAVE_AV_CONFIG_H -DBUILD_AVUTIL -I.. -D_FILE_OFFSET_BITS=64 
> -D_LARGEFILE_SOURCE -D_GNU_SOURCE  -c -o rational.o rational.c
> In file included from rational.c:30:
> common.h:608: warning: static declaration of 'lrintf' follows non-static 
> declaration
> gcc -O3 -g -Wall -Wno-switch  -Wdeclaration-after-statement 
> -DHAVE_AV_CONFIG_H -DBUILD_AVUTIL -I.. -D_FILE_OFFSET_BITS=64 
> -D_LARGEFILE_SOURCE -D_GNU_SOURCE  -c -o intfloat_readwrite.o 
> intfloat_readwrite.c
> In file included from intfloat_readwrite.c:26:
> common.h:608: warning: static declaration of 'lrintf' follows non-static 
> declaration
> gcc -O3 -g -Wall -Wno-switch  -Wdeclaration-after-statement 
> -DHAVE_AV_CONFIG_H -DBUILD_AVUTIL -I.. -D_FILE_OFFSET_BITS=64 
> -D_LARGEFILE_SOURCE -D_GNU_SOURCE  -c -o crc.o crc.c
> In file included from crc.c:1:
> common.h:608: warning: static declaration of 'lrintf' follows non-static 
> declaration
> rm -f libavutil.a
> ar rc libavutil.a mathematics.o rational.o intfloat_readwrite.o crc.o
> ranlib libavutil.a
> make[1]: Leaving directory 
> `/opt/qpass/mediaconverter/tools/ffmpeg/libavutil'
> make -C libavcodec all
> make[1]: Entering directory 
> `/opt/qpass/mediaconverter/tools/ffmpeg/libavcodec'
> gcc -O3 -g -Wall -Wno-switch  -Wdeclaration-after-statement 
> -DHAVE_AV_CONFIG_H -I.. 
> -I/opt/qpass/mediaconverter/tools/ffmpeg/libavutil 
> -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE    -c -o 
> bitstream.o bitstream.c
> In file included from 
> /opt/qpass/mediaconverter/tools/ffmpeg/libavutil/avutil.h:24,
>                  from avcodec.h:14,
>                  from bitstream.c:28:
> /opt/qpass/mediaconverter/tools/ffmpeg/libavutil/common.h:608: warning: 
> static declaration of 'lrintf' follows non-static declaration
> gcc -O3 -g -Wall -Wno-switch  -Wdeclaration-after-statement 
> -DHAVE_AV_CONFIG_H -I.. 
> -I/opt/qpass/mediaconverter/tools/ffmpeg/libavutil 
> -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE    -c -o 
> utils.o utils.c
> In file included from 
> /opt/qpass/mediaconverter/tools/ffmpeg/libavutil/avutil.h:24,
>                  from avcodec.h:14,
>                  from utils.c:27:
> /opt/qpass/mediaconverter/tools/ffmpeg/libavutil/common.h:608: warning: 
> static declaration of 'lrintf' follows non-static declaration
> utils.c: In function `avcodec_string':
> utils.c:1093: warning: implicit declaration of function `_snprintf'
> utils.c: In function `av_tempfile':
> utils.c:1375: error: `_O_RDWR' undeclared (first use in this function)
> utils.c:1375: error: (Each undeclared identifier is reported only once
> utils.c:1375: error: for each function it appears in.)
> utils.c:1375: error: `_O_BINARY' undeclared (first use in this function)
> utils.c:1375: error: `_O_CREAT' undeclared (first use in this function)
> make[1]: *** [utils.o] Error 1
> make[1]: Leaving directory 
> `/opt/qpass/mediaconverter/tools/ffmpeg/libavcodec'
> make: *** [lib] Error 2
>
> any idea what could be causing this?

I have done a full update and rebuild and I dont have any of these 
problems. What's your platform? Mine is debian woody with gcc 2-95.

> thx
>
> Phil


--
Michel Bardiaux
R&D Director
T +32 [0] 2 790 29 41
F +32 [0] 2 790 29 02
E mailto:mbardiaux@xxxxxxxxxxx

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