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• 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.

• Force a vbscript to open command prompt in 64bit instead of 32bit

  26 juin 2015, par Arvo Bowen

  I have been trying to get this script to work all day !

  Here are some facts about my situation...

  • I have a program named "ffmpeg.exe" in my "C :\Windows\System32\" folder.
  • I DO NOT have that program in my "C :\Windows\SysWOW64\" folder.

  Currently this is the script I have...

  Option Explicit
  
  
  
  Dim oFSO, oShell, sCommand
  
  Dim sFilePath, sTempFilePath
  
  
  
  Set oFSO = CreateObject("Scripting.FileSystemObject")
  
  
  
  sFilePath = "C:\test\in_video.mkv"
  
  sTempFilePath = "C:\test\out_video.mp4"
  
  
  
  sCommand = "%comspec% /k ffmpeg -n -i """ + sFilePath + """ -c:v copy -c:a copy """ + sTempFilePath + """"
  
  WScript.Echo sCommand
  
  Set oShell = WScript.CreateObject("WScript.Shell")
  
  oShell.Run sCommand, 1, True
  
  Set oShell = Nothing
  
  
  
  Set oFSO = Nothing

  If I run this script manually at a command prompt then it seems to work just fine. But if I let another app run it (for example in this case uTorrent), it runs the script as expected but when it tries to process the oShell.Run command it runs that in a 32bit environment ! Then I get this...
  

  If I try to open up a new command prompt (nothing special) i seems to default to a 64bit environment and then I can type "ffmpeg" and it shows me the help content as expected.

  So for some reason I can’t get the script to run applications (specifically CMD) in the 64bit environment. Anyone know how I can achieve this ?

  ---

  Update

  Seems that my script is in fact being ran in 32bit mode ! Even though the script title bar says "C :\Windows\System32\cscript.exe", which is a 64bit environment !!

  I used the following script to determine that it was running in a 32bit environment...

  Dim WshShell
  
  Dim WshProcEnv
  
  Dim system_architecture
  
  Dim process_architecture
  
  
  
  Set WshShell =  CreateObject("WScript.Shell")
  
  Set WshProcEnv = WshShell.Environment("Process")
  
  
  
  process_architecture= WshProcEnv("PROCESSOR_ARCHITECTURE") 
  
  
  
  If process_architecture = "x86" Then    
  
      system_architecture= WshProcEnv("PROCESSOR_ARCHITEW6432")
  
  
  
      If system_architecture = ""  Then    
  
          system_architecture = "x86"
  
      End if    
  
  Else    
  
      system_architecture = process_architecture    
  
  End If
  
  
  
  WScript.Echo "Running as a " & process_architecture & " process on a " _ 
  
      & system_architecture & " system."

• aacpsy : use a different metric for the spread of a band

  2 juillet 2015, par Rostislav Pehlivanov

  aacpsy : use a different metric for the spread of a band
  This commit modifies 02dbed6 to use band->active_lines to better gauge how much information is contained within a single band and thus allow the perceptual noise subsitution to more accurately determine which bands to code as noise. The spread[w+g] used before this patch behaved more like a low-pass filter for PNS band_types, which could mistakingly mark some low frequency bands as noise.
  Reviewed-by : Claudio Freire <klaussfreire@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/aacpsy.c