Re: [libcvd-members] ffmpeg and swscale

[Pablo Barrera]

On 14/08/2008, at 17:14:59, Edward Rosten wrote:

> On Thu, 14 Aug 2008, Pablo Barrera wrote:
>
> > Hi
> >
> > I am trying to compile CVD in macosx but it seems that my version  
> > of ffmpeg is incompatible
> >
> > Undefined symbols:
> > "_img_convert", referenced from:
> >    CVD::VFB::RawVideoFileBuffer::read_next_frame()     in  
> > videofilebuffer.o
> > ld: symbol(s) not found
> > collect2: ld returned 1 exit status
> > make: *** [libcvd.dylib] Error 1
> >
> >
> > I've read in the archive of the mailing list this is a known issue.  
> > Is there any solution available yet? I've tried to fix myself but I  
> > lack a lot of knowledge about ffmpeg. Even with the information  
> > available at [1] [2] I haven't succeeded. Anyone with more  
> > knowledge about this could give some hints about what I should  
> > change at videofilebuffer.cc?
> >
> > Cheers,
> >
> > Pablo
> >
> > [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=487643
> > [2] http://svn.mplayerhq.hu/ffmpeg/trunk/vhook/watermark.c?r1=6577&r2=6649
>
> Try the latest version of libCVD from CVS. I've updated it to use  
> new versions of ffmpeg. You will have to compile ffmpeg with -- 
> enable-gpl --enable-swscale and compile libCVD with --enable-gpl in  
> order for this to work.
>
> I've tested it on 64 bit linux with the current latest SVN version  
> of ffmpeg. I'm guessing you have a much older version, since I had  
> to modify the code to look for headers in different places. It may  
> work with your version.


There is an small bug in the configure.in you changed to test the new  
library.

address@hidden cvs diff configure.in
Index: configure.in
===================================================================
RCS file: /cvsroot/libcvd/libcvd/configure.in,v
retrieving revision 1.133
diff -r1.133 configure.in
13a14,15
> AC_REQUIRE_CPP
>
758d759
<
760c761
< 		AC_CHECK_HEADERS(libavcodec/avcodec.h libavformat/avformat.h  
libswscale/swscale.h, [ffmpeg_new_headers=1], [a=1])
---
> 		AC_CHECK_HEADERS(libavcodec/avcodec.h libavformat/avformat.h  
libswscale/swscale.h, [ffmpeg_new_headers=1], [])
797a799
>


If you set a=1 and someone (like me) has the ffmpeg_old_headers, the  
configure script will not compile ffmpeg.

Pablo