Re: [libcvd-members] Open video error

[Edward Rosten]

On Tue, 2 Aug 2011, Gabriel wrote:

> 2011/7/14 Gerhard Reitmayr <address@hidden>
>       Hi Gabriel,
>
>       you need to configure libcvd with  --enable-gpl so that the 
> VideoFileBuffer is included. VideoFileBuffer uses ffmpeg libraries which
>       are GPL (I guess) and not enabled by default, because it would propagate 
> the GPL terms to the user's code.
>
>       cheers,
>         Gerhard
>
>
> Thank for your help... but i cant solve the trouble.
> I run ./configure -with_ffmpeg -with_v4l2 -enable_gpl (for example)
> In the process print:
> checking for v4l2... no
> checking for strange v4l2... no
> checking linux/videodev.h usability... yes
> checking linux/videodev.h presence... yes

Which version of libCVD are you running? If you're not using the latest 
CVS version can you try it? The FFMPEG people have made the headers rather 
hard to use with C++. The most recent versions of libCVD have fixes in for 
this, but I haven't made a release of CVD for a while now.

If that doesn't work, can you send the config.log file?

-Ed


> more...
>
> checking ffmpeg/avcodec.h usability... no
> checking ffmpeg/avcodec.h presence... no
> checking for ffmpeg/avcodec.h... no
> checking ffmpeg/avformat.h usability... no
> checking ffmpeg/avformat.h presence... no
> checking for ffmpeg/avformat.h... no
> checking ffmpeg/swscale.h usability... no
> checking ffmpeg/swscale.h presence... no
> checking for ffmpeg/swscale.h... no
> checking libavcodec/avcodec.h usability... no
> checking libavcodec/avcodec.h presence... yes
> configure: WARNING: libavcodec/avcodec.h: present but cannot be compiled
> configure: WARNING: libavcodec/avcodec.h:     check for missing prerequisite 
> headers?
> configure: WARNING: libavcodec/avcodec.h: see the Autoconf documentation
> configure: WARNING: libavcodec/avcodec.h:     section "Present But Cannot Be 
> Compiled"
> configure: WARNING: libavcodec/avcodec.h: proceeding with the compiler's result
> checking for libavcodec/avcodec.h... no
> checking libavformat/avformat.h usability... no
> checking libavformat/avformat.h presence... yes
> configure: WARNING: libavformat/avformat.h: present but cannot be compiled
> configure: WARNING: libavformat/avformat.h:     check for missing prerequisite 
> headers?
> configure: WARNING: libavformat/avformat.h: see the Autoconf documentation
> configure: WARNING: libavformat/avformat.h:     section "Present But Cannot Be 
> Compiled"
> configure: WARNING: libavformat/avformat.h: proceeding with the compiler's 
> result
> checking for libavformat/avformat.h... no
> checking libswscale/swscale.h usability... no
> checking libswscale/swscale.h presence... yes
> configure: WARNING: libswscale/swscale.h: present but cannot be compiled
> configure: WARNING: libswscale/swscale.h:     check for missing prerequisite 
> headers?
> configure: WARNING: libswscale/swscale.h: see the Autoconf documentation
> configure: WARNING: libswscale/swscale.h:     section "Present But Cannot Be 
> Compiled"
> configure: WARNING: libswscale/swscale.h: proceeding with the compiler's result
>
> more...
>
> Missing options for linux-gnu:
> dc1394v1 dc1394v2 ffmpeg v4l2buffer
>
> I cant understand why dont work...
>
>  
>
> On 14 Jul 2011, at 00:53, Gabriel wrote:
>
> > I compile this code:
> >
> > #include <cvd/videosource.h>
> > #include <cvd/videodisplay.h>
> > #include <cvd/gl_helpers.h>
> >
> > using namespace CVD;
> >
> > int main()
> > {
> >     try
> >     {
> >         VideoBuffer<Rgb<byte> > * video_buffer =
> > open_video_source<Rgb<byte> >("file://test_jt.avi");
> >         VideoDisplay disp(video_buffer->size());
> >         while(1)
> >         {
> >             VideoFrame<Rgb<byte> > *frame = video_buffer->get_frame();
> >             glDrawPixels(*frame);
> >             video_buffer->put_frame(frame);
> >         }
> >     }
> >     catch(Exceptions::All error)
> >     {
> >         std::cerr << "Error: " << error.what << std::endl;
> >     }
> >
> > }
> >
> > I run the program and get this error: Error: VideoFileBuffer is not
> > compiled in to libcvd.
> > I try many solutions without find the trouble.
> > I appreciate any help
> >
> > --
> > Gabriel
> >
> > Antes de imprimir, pensá en tu responsabilidad y compromiso con el
> > MEDIO AMBIENTE.
> >
> > _______________________________________________
> > libcvd-members mailing list
> > address@hidden
> > https://lists.nongnu.org/mailman/listinfo/libcvd-members
>
> --
> Gerhard Reitmayr
> Institute for Computer Graphics and Vision
> http://www.icg.tugraz.at/Members/gerhard
> tel: ++43 316 873 5082
>
>
>
>
>
>
> --
> Gabriel
>
> Antes de imprimir, pensá en tu responsabilidad y compromiso con el MEDIO 
> AMBIENTE.

--
Edward Rosten                     Machine Intelligence Laboratory
http://mi.eng.cam.ac.uk/~er258          Department of Engineering
+44 1223 7 65960                          University of Cambridge