Access violation and heap corruption when disposing MediaFile object

[mohelwazer]

Open any video file var mediaFile = MediaFile.Open(videoPath); then I got all the frames using TryReadNextFrame(out ImageData).
Then I wanted to dispose the mediaFile after that a heap corruption or access violation happens.
I have traced the problem to InputContainer class, OnDisposing() method line marked with ->>>>

protected override void OnDisposing()
{
     Video?.Dispose();
  
      var ptr = Pointer;
      ffmpeg.avformat_close_input(&ptr);
  
      // Note: the internal buffer could have changed, and be != avio_ctx_buffer
      if (Pointer->pb != null)
      {
          ffmpeg.av_free(Pointer->pb->buffer);
          
          ->>>>  ffmpeg.avio_context_free(&Pointer->pb);
      }
}