crash - On memcpy application crashes - FFMPEG, C++ -

i have been working ffmpeg, got working good, got memory leak, followed instructions fix (like use av_frame_unref), needed update ffmpeg version 1.2. weird me, because working good, , then, update, application started crash in memcpy.

honestly, don't know what's happening, tried google no answer. appreciate help, here segment of code 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); // test if app si reaching av_free_packet         av_free_packet(&pkt);     }      if(do_rt){         return data_size;     }      // try 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 much.