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  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
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  • HTML5 audio and video support

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  • why type casting on non-pointer struct give syntax error

    1er avril 2020, par Sany Liew

    I am using Visual C++ express 2008 try to compile code similar to below :

    



    no problem

    



    {
  ...
  AVRational test = {1, 1000};
  ...
}


    



    but has problem when it is as below :

    



    {
  ...
  AVRational test = (AVRational){1, 1000};
  ...
}


    



    gave errors :

    



    1>..\..\..\projects\test\xyz.cpp(1139) : error C2059: syntax error : '{'
1>..\..\..\projects\test\xyz.cpp(1139) : error C2143: syntax error : missing   ';' before '{'
1>..\..\..\projects\test\xyz.cpp(1139) : error C2143: syntax error : missing ';' before '}'


    



    where AVRational (ffmpeg.org library) is defined as :

    



    typedef struct AVRational{
    int num; ///< numerator
    int den; ///< denominator
} AVRational;


    



    FFmpeg come with some pre-define value such as

    



    #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}


    



    which is used as below

    



    av_rescale_q(seek_target, AV_TIME_BASE_Q, pFormatCtx->streams[stream_index]->time_base);


    



    will failed to compile on Visual C++ express 2008

    



    It seem like the same code will be compiled with no error/warning on gcc compiler. Why I get this error on VC++ ? Is it a C/C++ standard way to do casting on struct value ? Anyway I can avoid this error while still able to use the defined AV_TIME_BASE_Q ?

    


  • why type casting on non-pointer struct give syntax error

    31 mars 2016, par Sany Liew

    I am using Visual C++ express 2008 try to compile code similar to below :

    no problem

    {
    
  ...
    
  AVRational test = {1, 1000};
    
  ...
    
}

    but has problem when it is as below :

    {
    
  ...
    
  AVRational test = (AVRational){1, 1000};
    
  ...
    
}

    gave errors :

    1>..\..\..\projects\test\xyz.cpp(1139) : error C2059: syntax error : '{'
    
1>..\..\..\projects\test\xyz.cpp(1139) : error C2143: syntax error : missing   ';' before '{'
    
1>..\..\..\projects\test\xyz.cpp(1139) : error C2143: syntax error : missing ';' before '}'

    where AVRational (ffmpeg.org library) is defined as :

    typedef struct AVRational{
    
    int num; ///< numerator
    
    int den; ///< denominator
    
} AVRational;

    FFmpeg come with some pre-define value such as

    #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}

    which is used as below

    av_rescale_q(seek_target, AV_TIME_BASE_Q, pFormatCtx->streams[stream_index]->time_base);

    will failed to compile on Visual C++ express 2008

    It seem like the same code will be compiled with no error/warning on gcc compiler. Why I get this error on VC++ ? Is it a C/C++ standard way to do casting on struct value ? Anyway I can avoid this error while still able to use the defined AV_TIME_BASE_Q ?

  • avformat/wavenc : Fix leak and segfault on reallocation error

    22 février 2021, par Andreas Rheinhardt
    avformat/wavenc : Fix leak and segfault on reallocation error

    Up until now, the wav muxer used a reallocation of the form ptr =
    
av_realloc(ptr, size) ; that leaks upon error. Furthermore, if a
    
failed reallocation happened when writing the trailer, a segfault
    
would occur due to avio_write(NULL, size) because the muxer only
    
prints an error message upon allocation error, but does not return
    
the error.
    

    Moreover setting the pointer to the buffer to NULL on error seems to
    
be done on purpose in order to record that an error has occured so that
    
outputting the peak values is no longer attempted. This behaviour has
    
been retained by simply disabling whether peak data should be written
    
if an error occurs.
    

    Finally, the reallocation is now done once per peak block and not once
    
per peak block per channel ; it is also done with av_fast_realloc and not
    
with a linear size increase.
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    • [DH] libavformat/wavenc.c

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