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• When second time to do video processing using FFmpeg in JNI in Android, the app crashes with fatal signal 11

  25 septembre 2013, par user1914692

  (1)
  This is an Android application, perform video processing using FFmpeg in JNI in Android.
  When the app is installed in the device, and run the first time to process one video file, the app runs very well.
  After the first video file is processed, I proceed to choose the second video file to start processing. The app immediately crashes.

  Log error is :

  > 09-25 10:53:52.801: I/native-activity(2339): begin: open_input_file
  
  > .mov .
  
  >     09-25 10:53:52.801: I/native-activity(2339): open_input_file
  
  >     09-25 10:53:52.801: I/native-activity(2339): begin: avformat_open_input .
  
  >     09-25 10:53:52.811: I/native-activity(2339): avformat_open_input ret: 0 
  
  >     09-25 10:53:52.811: I/native-activity(2339): begin: avformat_find_stream_info .
  
  >     09-25 10:53:52.811: A/libc(2339): Fatal signal 11 (SIGSEGV) at 0x00000028 (code=1), thread 2569 (IntentService[V)

  The app crashes in "ret = avformat_find_stream_info(inVStruct.inFormatContext, NULL"
  See the snippet below :

  LOGI("begin: avformat_find_stream_info .\n");
  
  if ((ret = avformat_find_stream_info(inVStruct.inFormatContext, NULL)) < 0) {
  
      LOGI("Cannot find stream information\n");
  
      av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
  
      return ret;
  
  }

  (2)
  Following the FFmpeg tutorial, I have done 5 steps to free memory for related variables in opened input video file and output video file :

  // 1: close CodecContext: avcodec_close(AVCodecContext)
  
  // 2: free Frame: avcodec_free_frame(AVFrame *): free frame and dynamically allocated objects in it, e.g. extended_data; av_free(AVFrame *)
  
  // 3: close the file (either AVFormatContext->pb, or FILE *): avio_close(AVFormatContext->pb); fclose(FILE *)
  
  // 4: free AVFormatContext and all its streams: avformat_free_context(AVFormatContext *)
  
  // 5: free data:  av_free( * ): Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). av_freep recommended. e.g. av_free(avPicture.data[0]);

  All freeings are fine.

  One minor point : From demuxing.c, it seems it does not do avformat_free_context for the input video file.
  I tried that in the program, and it shows error ; so I remove the two sentences below.

  avformat_free_context(inVStruct.inFormatContext);
  
  LOGI("finish: inVStruct.inFormatContext"); 
  
  
  
  09-25 10:49:40.222: A/libc(1915): @@@ ABORTING: LIBC: ARGUMENT IS INVALID HEAP ADDRESS IN dlfree addr=0x7204a0a8
  
  09-25 10:49:40.222: A/libc(1915): Fatal signal 11 (SIGSEGV) at 0xdeadbaad (code=1), thread 2107 (IntentService[V)

  (3)
  I suspect the the crash when doing processing the 2nd time is because of something is not freed, so it is out of memory.
  But I do free those variables.

  Any clue ? Thanks !