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• How to properly apply `afade` filter in latest `ffmpeg` ?

  29 juillet 2018, par Ando

  I have an audio file that I successfully clipped down to 10 seconds using the ffmpeg library. I’ve tried applying a fade in and a fade out using the following :

  ffmpeg -i casio-intro.mp3 -af 'afade=in:st=0:d=2,afade=out:st=8:d=2' casio-fade-intro.mp3

  I also tried :
  ffmpeg -i casio-intro.mp3 -af 'afade=t=in:ss=0:d=3,afade=t=out:st=8:d=2' casio-fade-intro.mp3

  but neither of these produces an output file with fade in and fade out effects. Am I doing something wrong ?

• How to build latest ffmpeg for android-ffmpeg project on github

  9 février 2015, par user2927954

  I am working on https://github.com/guardianproject/android-ffmpeg project.
  In this project, it uses ffmpeg version 0.11.1.
  How can i build this project with the latest ffmpeg version ?

  I try to delete ffmpeg folder in this project. Checkout the latest ffmpeg version in url : [git ://git.videolan.org/ffmpeg.git]. After that, i ran command ./configure_make_everything.sh as normal but i got error :

      File to patch: 
  
  Skip this patch? [y] 
  
  Skipping patch.
  
  3 out of 3 hunks ignored
  
  patching file libavutil/arm/intmath.h
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  3 out of 3 hunks ignored
  
  patching file configure
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  ~/workspace/android-ffmpeg/ffmpeg ~/workspace/android-ffmpeg ~/workspace/android-ffmpeg
  
  **ERROR: freetype2 not found**
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solving the problem.
  
  ~/workspace/android-ffmpeg ~/workspace/android-ffmpeg
  
  ~/workspace/android-ffmpeg
  
  ~/workspace/android-ffmpeg ~/workspace/android-ffmpeg
  
  ~/workspace/android-ffmpeg/ffmpeg ~/workspace/android-ffmpeg ~/workspace/android-ffmpeg
  
  Makefile:2: config.mak: No such file or directory
  
  Makefile:53: /common.mak: No such file or directory
  
  Makefile:93: /libavutil/Makefile: No such file or directory
  
  Makefile:93: /library.mak: No such file or directory
  
  Makefile:95: /doc/Makefile: No such file or directory
  
  Makefile:178: /tests/Makefile: No such file or directory
  
  make: *** No rule to make target `/tests/Makefile'.  Stop.
  
  Makefile:2: config.mak: No such file or directory
  
  Makefile:53: /common.mak: No such file or directory
  
  Makefile:93: /libavutil/Makefile: No such file or directory
  
  Makefile:93: /library.mak: No such file or directory
  
  Makefile:95: /doc/Makefile: No such file or directory
  
  Makefile:178: /tests/Makefile: No such file or directory
  
  make: *** No rule to make target `/tests/Makefile'.  Stop.
  
  ~/workspace/android-ffmpeg ~/workspace/android-ffmpeg
  
  ~/workspace/android-ffmpeg
  
  admin@ubuntu:~/workspace/android-ffmpeg$

  I got error : Freetype2 not found but if i build with the original ffmpeg include in this project, this error is not occur.

  How can i fix it ? Please help

• Not able to decode mp4 file using latest ffmpeg library : av_decode_video2

  8 février 2017, par suvirai

  I am writing a wrapper code around latest ffmpeg library. I am supplying MP4 files from local system. My problem is that I am unable to get any decoded frames when I use av_decode_video2(). The return value comes out to be negative. I have used av_read_frame() which returns 0. I googled about the problem I am facing but no where could I find the correct explanation. Please give me insight here. Pasting the pseudo code here.

      av_init_packet(avpkt);
  
      picture=av_frame_alloc();
  
      pFrameRGB=av_frame_alloc();
  
      codec = avcodec_find_decoder(CODEC_ID_H264);
  
      c= avcodec_alloc_context3(codec)
  
      avcodec_open2(decoderLibraryData->c, decoderLibraryData->codec, NULL)
  
      FormatContext = avformat_alloc_context();
  
      char *pUrl ="./1.MP4";
  
  
  
      iRet = avformat_open_input(atContext, pUrl, pFmt, NULL);
  
  
  
      if(FormatContext == NULL)
  
      {
  
          printf("could not assign any memory !!!!!!!!! \n");
  
      }
  
  
  
      avformat_find_stream_info(FormatContext, NULL);
  
  
  
  
  
      while(av_read_frame(FormatContext,avpkt) >= 0)
  
      {
  
  
  
        len = avcodec_decode_video2(c, picture, &got_picture,avpkt);
  
  
  
        printf("CODEC MANAGER len %d Frame decompressed %d \n",len,got_picture);
  
  
  
        if (len <= 0) 
  
        {
  
          return ERROR;
  
        }
  
      }
  
  }
  
  
  
  
  
  
  
          if(lastHeight != 0 && lastWidth != 0)
  
          {
  
              if(lastWidth != c->width || lastHeight != c->height )
  
              {
  
                  av_free(buffer);
  
                  buffer = NULL;
  
                  lastWidth = c->width;
  
                  lastHeight = c->height;
  
  
  
              }
  
          }
  
          else
  
          {
  
              lastWidth = c->width;
  
              lastHeight = c->height;
  
          }
  
          decodeFlag = 1;
  
          if(!buffer)
  
          {
  
              int numBytes;
  
              v_mutex_lock(globalCodecLock);
  
              switch(inPixFormat)
  
              {
  
              case RGB:
  
  
  
  
  
                  // Determine required buffer size and allocate buffer
  
                  numBytes=avpicture_get_size(PIX_FMT_RGB24, c->width, c->height);
  
  
  
                  buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
  
                  avpicture_fill((AVPicture *)pFrameRGB,buffer,PIX_FMT_RGB24,c->width, c->height);
  
  
  
                  if(cntxt)
  
                      sws_freeContext(cntxt);
  
  
  
                  cntxt = sws_getContext(c->width, c->height, c->pix_fmt,
  
                          c->width, c->height, PIX_FMT_RGB24, SWS_BICUBIC, NULL, NULL, NULL);
  
  
  
                  break;
  
  
  
              }
  
              v_mutex_unlock(globalCodecLock);
  
              if(cntxt == NULL)
  
              {
  
                  printf("sws_getContext error\n");
  
                  return ERROR;
  
              }
  
              }
  
  
  
          {
  
              sws_scale(cntxt, picture->data, picture->linesize, 0, c->height, pFrameRGB->data, pFrameRGB->linesize);
  
              if(rgbBuff)
  
              {
  
  
  
  
  
                  if(c->width <= *width && c->height <= *height)
  
                  {                   
  
                      saveFrame(pFrameRGB, c->width, c->height, rgbBuff,inPixFormat);
  
  
  
                      *width = c->width;
  
                      *height = c->height;
  
                      rs = SUCCESS;
  
                      break;
  
                  }
  
                  else
  
                  {
  
                      rs = VA_LOWBUFFERSIZE;
  
                  }
  
              }
  
              else
  
              {
  
                  rs = VA_LOWBUFFERSIZE;
  
              }
  
          }
  
          if(width)
  
          {
  
              *width = c->width;
  
          }
  
          if(height)
  
          {
  
              *height = c->height;
  
          }
  
          if(rs == VA_LOWBUFFERSIZE)
  
          {
  
              break;
  
          }

  I am getting the return value of av_read_frame as 0 but av_decode_video2 returns value in negative. I am not able to get any clue here.