Grabbing/recording packets doesn't work, EXCEPTION_ACCESS_VIOLATION.

Hello, I'm trying to send a stream from grabber to recorder without transcoding. I already received some help from Samuel Audet, who pointed me to this sample: https://github.com/bytedeco/javacv/blob/master/samples/PacketRecorderTest.java#L53

I tried it, but it doesn't work, in two ways. First, the grabbed packets are obviously incorrect, judging by their size (1 byte), always-zero timestamp and non-changing state of the grabber. And after I put the first such packet to the recorder, the JVM fails with fatal error EXCEPTION_ACCESS_VIOLATION.

Here is the code:

public static void packetRecord(String inputFile, String outputFile) throws FrameGrabber.Exception, FrameRecorder.Exception {
      FFmpegFrameGrabber grabber=new FFmpegFrameGrabber(inputFile);
      grabber.start();
      FFmpegFrameRecorder recorder=new FFmpegFrameRecorder(
         outputFile, grabber.getImageWidth(), grabber.getImageHeight(),
         AUDIO_ENABLED? 1: 0
      );
      recorder.setSampleRate(grabber.getSampleRate());
      recorder.setFrameRate(grabber.getFrameRate());
      recorder.setVideoBitrate(grabber.getVideoBitrate());
      recorder.setVideoCodec(grabber.getVideoCodec());
      //recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
      
      recorder.start(grabber.getFormatContext());
      System.out.println("recorder started");
      avcodec.AVPacket packet;
      long t1=System.currentTimeMillis();
      while((packet=grabber.grabPacket())!=null){
         System.out.println("packet: "+packet);
         System.out.println("  ts: "+grabber.getTimestamp());
         recorder.recordPacket(packet);
         if((System.currentTimeMillis()-t1)>MAX_DURATION) break;
      }
      recorder.stop();
      grabber.stop();
   }

and the output:

recorder started
packet: org.bytedeco.javacpp.avcodec$AVPacket[address=0x153e5a20,position=0,limit=1,capacity=1,deallocator=org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0x153e5a20,deallocatorAddress=0x6a1c1c80]]
  ts: 0
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000007faab256356, pid=4852, tid=7620
#
# JRE version: Java(TM) SE Runtime Environment (8.0_40-b26) (build 1.8.0_40-b26)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.40-b25 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# C  [avformat-57.dll+0xc6356]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# D:\serge\my_projects\upwork\streaming\java\classes\hs_err_pid4852.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
Input #0, avi, from '../../data/pepa10.avi':
  Metadata:
    encoder         : Lavf57.82.101
  Duration: 00:00:10.01, start: 0.000000, bitrate: 628 kb/s
    Stream #0:0: Video: mpeg4 (Simple Profile) (xvid / 0x64697678), yuv420p, 720x576 [SAR 248:231 DAR 310:231], 450 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 160 kb/s
[avi @ 0000000015d400a0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
[avi @ 0000000015d400a0] Aspect ratio mismatch between muxer (1/1) and encoder layer (248/231)
Output #0, avi, to '../../data/pepa10copy.avi':
    Stream #0:0: Video: mpeg4 (Simple Profile) (xvid / 0x64697678), yuv420p, 720x576 [SAR 248:231 DAR 310:231], q=2-31, 450 kb/s, SAR 1:1 DAR 5:4, 25 tbn, 25 tbc
    Stream #0:1: Unknown: none
[avi @ 0000000015d400a0] Timestamps are unset in a packet for stream 1. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
[avi @ 0000000015d400a0] Encoder did not produce proper pts, making some up.

Process completed.

Did anyone have success with packet transmission?

Thanks a lot