[Ffmpeg-devel] Re: [RFC] ffmpeg-windows mailinglist?

Ramiro Polla ramiro86
Fri Aug 4 05:42:06 CEST 2006

V?ctor Paesa wrote:
>>>On Wed, 2006-08-02 at 11:35  0200, Luca Abeni wrote:
>>>>On Wed, 2006-08-02 at 10:49  0200, Diego Biurrun wrote:
>>>>>Did you experiment with shared libs as well?
>>>>Sorry, I did not try (I rarely use shared libraries on linux, too ;-).
>>>>simply did
>>>>./configure --enable-memaling-hack; make
>>>>This evening I'll try shared libs on mingw and I'll let you know
>>>Ok, I tried, and I had 3 small problems:
>>>1) libavformat/gxf.c, line 201:
>>>     extern const AVRational ff_frame_rate_tab[];
>>>somehow, mingw does not like this (ff_frame_rate_tab is defined in a
>>>different dll). I do not know if some compiler directive can be used to
>>>make ff_frame_rate visible, or some other hack has to be used (or if the
>>>problem is limited to my mingw installation ;-)
>>Under Cygwin I get these info messages while linking avformat, they
>>mention ff_frame_rate_tab:
>>gcc -shared -Wl,--out-implib=libavformat.dll.a -Wl,--warn-common
>>-o cygavformat-50.dll utils.o cutils.o os_support.o allformats.o pnm.o
>>yuv.o png.o jpeg.o gifdec.o sgi.o framehook.o avio.o aviobuf.o file.o
>>udp.o tcp.o http.o rtsp.o rtp.o rtpproto.o 4xm.o adtsenc.o aiff.o riff.o
>>amr.o asf.o asf-enc.o au.o avidec.o avienc.o avs.o crc.o daud.o dv.o
>>electronicarts.o ffm.o flic.o flvdec.o flvenc.o gif.o gxf.o idcin.o
>>idroq.o img2.o img.o ipmovie.o matroska.o mm.o mmf.o mov.o isom.o
>>movenc.o mp3.o mpeg.o mpegts.o mpegtsenc.o mpjpeg.o mxf.o nsvdec.o
>>nut.o nuv.o ogg2.o oggparsevorbis.o oggparsetheora.o oggparseflac.o
>>oggparseogm.o psxstr.o raw.o rm.o segafilm.o sierravmd.o smacker.o
>>sol.o swf.o tta.o voc.o wav.o wc3movie.o westwood.o yuv4mpeg.o
>>audio.o -L../libavutil -lavutil -lavcodec -L../libavcodec -lz
>>Creating library file: libavformat.dll.a
>>Info: resolving _mjpeg_decoder by linking to __imp__mjpeg_decoder
>>Info: resolving _mjpeg_encoder by linking to __imp__mjpeg_encoder
>>Info: resolving _ff_frame_rate_tab by linking to __imp__ff_frame_rate_tab
>>Info: resolving _ff_log2_tab by linking to __imp__ff_log2_tab
>>Info: resolving _av_crc04C11DB7 by linking to __imp__av_crc04C11DB7
>>Maybe your binutils don't support fully auto_import?
>>Mine are 20050610-1
>>(By they way, I don't use the newer binutils 20060709-1, they don't link
>>things properly ffmpeg under Cygwin)
>I downloaded MinGW, and attempted:
>./configure --enable-shared --disable-static --enable-memalign-hack
>I got your error if binutils was binutils-2.15.91-20040904-1.tar.gz
>gxf.o(.text 0x787): In function `gxf_header':
>variable 'ff_frame_rate_tab' can't be auto-imported. Please read the
>documentation for ld's --enable-auto-import for details.
>I upgraded to binutils-2.16.91-20060119-1.tar.gz, and then the build
>completed succesfully.
>I also got a succesful build while using binutils-2.17.50-20060716-1.tar.gz
>Hence the MinGW port is indeed in good shape, and MinGW developers should 
>adviced to avoid binutils-2.15.91-20040904-1.tar.gz.
>Even though your nice web page recommends 
>maybe it might be helpful to add a explicit warning to avoid

Ramiro Polla
>V?ctor Paesa
>P.S. I used gcc 3.4.2 just in case success depends also on compiler 
>ffmpeg-devel mailing list
>ffmpeg-devel at mplayerhq.hu

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