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• FFMPEG undefined reference to `avdevice_register_all'

  23 février 2016, par user3177342

  I’m trying to build simple programm using ffmpeg

  #include 
  
   #include 
  
   #define __STDC_CONSTANT_MACROS
  
  extern "C" {
  
   #include <libavcodec></libavcodec>avcodec.h>
  
   #include <libavformat></libavformat>avformat.h>
  
   #include <libavformat></libavformat>avio.h>
  
  #include <libavdevice></libavdevice>avdevice.h>
  
  #include <libavutil></libavutil>time.h>
  
   }
  
  
  
  
  
  #include <iostream> 
  
  
  
  
  
   int main( int argc, char* argv[] )
  
   {
  
     AVCodec *icodec;
  
    AVFormatContext *ifcx = NULL;
  
    AVInputFormat *ifmt;
  
    AVCodecContext *iccx;
  
     AVStream *ist;
  
     AVStream *ost;
  
     AVPacket pkt;
  
     int i_index;
  
    int64_t timenow, timestart;
  
     int got_key_frame = 0;
  
  
  
     AVFormatContext *ofcx;
  
  
  
     const char *sProg = argv[ 0 ];
  
     const char *sFileInput;
  
     const char *sFileOutput;
  
    int64_t bRunTime;
  
  
  
    bRunTime = atoi( argv[ 2 ] ) * 1000000;
  
  
  
     // Initialize library
  
     av_log_set_level( AV_LOG_DEBUG );
  
     av_register_all();
  
     avcodec_register_all(); 
  
     avformat_network_init();
  
     avdevice_register_all();
  
  </iostream>

  And i get these errors

  g++ -o rtsp3 -I/usr/include -I/usr/local/include rtsp3.cpp -lavformat -lavcodec -lavutil -lm -lz -lva -lpthread
  /tmp/ccAXDgvi.o : In function

  main':
rtsp3.cpp:(.text+0x115): undefined reference to

  avdevice_register_all’
  /usr/local/lib/libavformat.a(matroskadec.o) : In function

  matroska_decode_buffer':
/home/user/projects/ffmpeg-git/ffmpeg/libavformat/matroskadec.c:1242: undefined reference to

  BZ2_bzDecompressInit’
  /home/user/projects/ffmpeg-git/ffmpeg/libavformat/matroskadec.c:1257 : undefined reference to

  BZ2_bzDecompress'
/home/user/projects/ffmpeg-git/ffmpeg/libavformat/matroskadec.c:1250: undefined reference to

  BZ2_bzDecompressEnd’
  /home/user/projects/ffmpeg-git/ffmpeg/libavformat/matroskadec.c:1262 : undefined reference to `BZ2_bzDecompressEnd’
  collect2 : error : ld returned 1 exit status

  I have git version of ffmpeg and successfully compiled it and make install.

• pthread_frame : Unreference hw_frames_ctx on per-thread codec contexts

  3 novembre 2016, par Mark Thompson

  pthread_frame : Unreference hw_frames_ctx on per-thread codec contexts
  When decoding with threads enabled, the get_format callback will be
  
  called with one of the per-thread codec contexts rather than with the
  
  outer context.  If a hwaccel is in use too, this will add a reference
  
  to the hardware frames context on that codec context, which will then
  
  propagate to all of the other per-thread contexts for decoding.  Once
  
  the decoder finishes, however, the per-thread contexts are not freed
  
  normally, so these references leak.
  

  • [DBH] libavcodec/pthread_frame.c

• lavc/aacpsdsp : precompute constant factors

  20 septembre 2022, par Rémi Denis-Courmont

  lavc/aacpsdsp : precompute constant factors
  The input complex factors are constant for each iterations. This
  
  substitudes 4 loads, 2 additions and 2 subtractions per iteration of
  
  the inner-loop with another 4 loads. Thus effectively 4 arithmetic
  
  operations per iteration of the inner loop are avoided, i.e. 24
  
  operations per iteration of the outer loop, or 24 * (n - 1) operations
  
  in total.
  If the inner loop is not unrolled by the compiler, this also might
  
  also save some pointer arithmetic as most instruction sets do not
  
  have addressing modes with negated register offsets (12 - j). Unless
  
  the compiler is optimising for code size, this is unlikely though.
  

  • [DH] libavcodec/aacpsdsp_template.c