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Sur d’autres sites (7123)

  • Compiling ffmpeg : how to force it to link to a specific libx264 ?

    29 août 2012, par PaulJ

    I'm trying to compile the newest version of ffmpeg (in CentOS 5.3). I first downloaded the latest version of libx264, compiled it with --enable-static and installed it in /usr/local/. However, when I then compile ffmpeg I get this error message :

    libavcodec/libavcodec.a(libx264.o): In function `X264_init':
    
/usr/local/src/ffmpeg/libavcodec/libx264.c:494: undefined reference to `x264_encoder_open_125'
    
collect2: ld returned 1 exit status
    
make: *** [ffmpeg_g] Error 1

    Searching on the net, I see that this can happen if ffmpeg is picking up an older version of libx264, which I indeed have (in /usr/lib) and can't uninstall because other pieces of software depend on it. The question is then : how can I force ffmpeg to link against the libx264 that I want ? The last time I had to do this (admittedly a year ago) I also had 2 versions of libx264, and I don't remember having to do anything special. Is there a configure switch that I'm forgetting ?

  • FFMPEG build on eclipse - 2 structs of the same name overlapping on a build

    30 juillet 2013, par ApolloKing

    I am currently working on the libav api provided by FFMPEG, and I have successfully compiled and installed FFMPEG onto my OS (Via ./configure, make, make install) Now I want to run it on Eclipse, so I imported the latest ffmpeg build and tried to build it (with ./configure).

    I built ffmpeg, but there are two structs overlapping one another. ffmpeg.h contains a struct outputstream while another file in the libavfolder called smoothstreamingenc.h contains another struct of the same name : outputstream.

    The question is, what must be done to resolve this without messing up the ffmpeg build ?

  • How to specify a non default type when calling a FFmpeg library using ctypes

    1er août 2013, par Jim Ramberg

    I am calling an FFMPEG library called avformat_alloc_context() that returns a pointer to type AVFormatContext. The structure AVFormatContext is defined in the avformat library.

    Obviously ; this is not one ctypes default types and results in an error when I try to pass a reference to it to another ffmpeg library further down in my code.

    Is there a way to add in the the classes defined inside of the library ? I read through what documentation I could find online and was not able to find a good answer to this question.

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