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

Víctor Paesa wzrlpy
Thu Aug 3 17:33:48 CEST 2006


>>> 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 ;-).
>>>> I
>>>> 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
>> -Wl,--as-needed
>> -Wl,-rpath-link,/home/wzrlpy/src/FFMpeg-20060802-5893/ffmpeg/libavcodec
>> -Wl,-rpath-link,/home/wzrlpy/src/FFMpeg-20060802-5893/ffmpeg/libavformat
>> -Wl,-rpath-link,/home/wzrlpy/src/FFMpeg-20060802-5893/ffmpeg/libavutil
>> -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
>> (auto-import)
>> Info: resolving _mjpeg_encoder by linking to __imp__mjpeg_encoder
>> (auto-import)
>> Info: resolving _ff_frame_rate_tab by linking to
>> __imp__ff_frame_rate_tab
>> (auto-import)
>> Info: resolving _ff_log2_tab by linking to __imp__ff_log2_tab
>> (auto-import)
>> Info: resolving _av_crc04C11DB7 by linking to __imp__av_crc04C11DB7
>> (auto-import)
>> 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':
> C:/msys/1.0/home/wzrlpy/src/FFMpeg-20060802-5893/ffmpeg/libavformat/gxf.c:202:
> 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
> be
> adviced to avoid binutils-2.15.91-20040904-1.tar.gz.
> Ramiro,
> Even though your nice web page recommends
> binutils-2.17.50-20060716-1.tar.gz,
> maybe it might be helpful to add a explicit warning to avoid
> binutils-2.15.91-20040904-1.tar.gz?

I spoke too soon, build with binutils-2.17.50-20060716-1.tar.gz succeeds,
but ffmpeg.exe dies upon startup.

Build with binutils-2.16.91-20060119-1.tar.gz succeeds, and ffmpeg.exe runs.
But "make test" doesn't work, probably some more $(EXESUF) are needed
in tests Makefile.

V?ctor Paesa

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