[gst-devel] Gst-ffmpeg Cygwin compile error

[Marko Mikkonen]

Thank you. Your tip caused me to try to compile ffmpeg-0.5 for cygwin. 
Again, no import libraries are created. Only .dll's. So maybe this is an 
ffmpeg problem... Hmmm... I should complain to ffmpeg people instead...

-M-


----- Original Message ----- 
From: "LRN" <lrn1986 at gmail.com>
To: "Discussion of the development of GStreamer" 
<gstreamer-devel at lists.sourceforge.net>
Sent: Wednesday, August 19, 2009 8:22 PM
Subject: Re: [gst-devel] Gst-ffmpeg Cygwin compile error


> Marko Mikkonen wrote:
>> Hello,
>>
>> I've been trying to compile ffmpeg gstreamer plugin with cygwin and it 
>> won't
>> compile.
>>
>> First some preliminaries: I use Cygwin 1.7 beta, because rtp/rtsp-plugins 
>> in
>> base plugins need IPv6 stuff and only Cygwin 1.7 beta has them.
>> Additionally, I've downloaded, compiled and installed glib-2.20.1 and
>> liboil-0.3.16. Other external libraries can be found in Cygwin. Oh, and I
>> had to fix glib-2.20.1 a bit: I set the return type of strsignal as char*
>> (instead of const char*) in gstrfuncs.c (line 1414). The compilation of
>> gstreamer-0.10.24, gst-plugins-base-0.10.24 and gst-plugins-good-0.10.15
>> (with ./configure --prefix=/usr --exec-prefix=/usr & make install) all 
>> went
>> well. But there's a problem with gst-ffmpeg-0.10.8.
>>
>> After configure, when I try to make, it goes well until I hit this spot:
>>
>> --------------------------------
>> Making all in ffmpeg
>>   CC    gstffmpeg.o
>>   CC    gstffmpegprotocol.o
>>   CC    gstffmpegcodecmap.o
>>   CC    gstffmpegutils.o
>>   CC    gstffmpegenc.o
>>   CC    gstffmpegdec.o
>>   CC    gstffmpegcfg.o
>>   CC    gstffmpegdemux.o
>>   CC    gstffmpegmux.o
>>   CC    gstffmpegdeinterlace.o
>>   CC    gstffmpegaudioresample.o
>>   LINK  libgstffmpeg.la
>>
>> *** Warning: Trying to link with static lib archive
>> ../../gst-libs/ext/ffmpeg/li
>> bavformat/libavformat.a.
>> *** I have the capability to make that library automatically link in when
>> *** you link to this library.  But I can only do this if you have a
>> *** shared version of the library, which you do not appear to have
>> *** because the file extensions .a of this argument makes me believe
>> *** that it is just a static archive that I should not use here.
>> -----------------------------
>>
>> There are similar complaints about libavcodec and libavutil. Then there's
>> lots of  "undefined references" to this and that, apparently things from
>> those libraries. Import libraries are not created (no files with 
>> extension
>> .dll.a can be found, except libgstffmpeg.dll.a). Static libraries are
>> created (libavcodec.a, libavformat.a and libavutil.a). However, dll's are
>> also created (cygavcodec-52.dll, cygavformat-52.dll and 
>> cygavutil-49.dll).
>> Is there a switch of some sort that creates import libraries or is this a
>> bug in the gst-ffmpeg build engine or Cygwin 1.7 beta? I've tried a bunch 
>> of
>> different switches.
>>
>> -M-
>>
> I don't know much about cygwin, so i don't really know if it is related
> or not...but i do know that gst-ffmpeg uses libtool in
> non-cross-platform way to link libav* to libgstffmpeg. As a result i
> have failed to build gst-ffmpeg on Windows with internal ffmpeg copy and
> had to resort to using external ffmpeg (of appropriate version, of 
> course).
>
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