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• On memcpy application crashes - FFMPEG, C++

  3 mai 2013, par Spamdark

  I have been working with ffmpeg, I got it working good, but I got a memory leak, I followed some instructions to fix it (like use av_frame_unref), so I needed to update ffmpeg to the version 1.2.
  This is weird for me, because everything was working good, and then, with the update, the application started to crash in a memcpy.

  Honestly, I don't know what's happening, I tried to google it but no answer. I would appreciate your help, here is the segment of the code which is failing :

  int WbMedia::DecodeAudioFrame(int16_t *audio_buf){
  
  static AVFrame *frame;
  
  static AVPacket pkt;
  
  static uint8_t *audio_pkt_data = NULL;
  
  static int audio_pkt_size = 0;
  
  static bool first_time = true;
  
  
  
  if(first_time){
  
      first_time=false;
  
  }
  
  
  
  int len1, data_size = 0;
  
  
  
  for(;;){
  
      bool do_rt = false;
  
  
  
      while(audio_pkt_size > 0){
  
          int obt_frame = 0;
  
  
  
          if (!frame) {
  
              if (!(frame = avcodec_alloc_frame())) {
  
                  MessageBox(0,"Out of memory error","Error: Memory",MB_ICONWARNING | MB_OK);
  
                  return -1;
  
              }
  
          }
  
  
  
          len1 = avcodec_decode_audio4(_audio_ccontext,frame,&obt_frame,&pkt);
  
          if(len1 < 0){
  
              audio_pkt_size = 0;
  
              break;
  
          }
  
  
  
          if(obt_frame){
  
              data_size = av_samples_get_buffer_size(NULL,channel_count,sample_fr,_audio_ccontext->sample_fmt,1);
  
              memcpy(audio_buf,frame->data[0],data_size);
  
          }
  
  
  
          audio_pkt_data+=len1;
  
          audio_pkt_size-=len1;
  
  
  
          if(data_size < 0){
  
              continue;
  
          }
  
  
  
  
  
          return data_size;
  
      }
  
  
  
      if(pkt.data){
  
          //MessageBox(0,"hi","Hi",MB_OK); // This is only for test if the app si reaching this av_free_packet
  
          av_free_packet(&pkt);
  
      }
  
  
  
      if(do_rt){
  
          return data_size;
  
      }
  
  
  
      // Try to get a new packet
  
      if(!audio_packets.empty()){
  
          WaitForSingleObject(Queue_Audio_Mutex,INFINITE);
  
              pkt = *audio_packets.front();
  
              audio_packets.pop();
  
          ReleaseMutex(Queue_Audio_Mutex);
  
  
  
          audio_pkt_size = pkt.size;
  
          audio_pkt_data = pkt.data;
  
      }else{
  
          return -1;
  
      }
  
  }
  
  return 0;
  
  }

  Thanks so much.

• Video editor application in android [on hold]

  26 janvier 2019, par Mustafa Çakar

  I want to make a video editor app, I also I want to add and remove text in the video. You can check renderforest video tab for example. I can use FFMPEG for basic editing operations like cropping, cutting, but I have no idea about set text or change text in the video. Do you have a source or library to suggest ? Sorry for my bad english.

• Révision 18749 : Application du patch de JLuc concernant la mise en forme des formulaires de conf...

  20 novembre 2011, par marcimat -

  Ticket #2408