public bool TryDecode(ref AVPacket packet, out AVFrame* pFrame)
 {
     int gotPicture;
     fixed (AVPacket* pPacket = &packet)
     {
         int decodedSize = FFmpegInvoke.avcodec_decode_video2(codec_context, avFrame, &gotPicture, pPacket);
         if (decodedSize < 0) { Console.WriteLine("Error while decoding frame."); }
     }
     pFrame = avFrame;
     return gotPicture == 1;
 }

 public bool TryDecode(ref AVPacket packet, ref AVFrame frame)
 {
     int gotPicture;
     fixed (AVPacket* pPacket = &packet)
     fixed (AVFrame* pFrame = &frame)
     {
         int decodedSize = FFmpegInvoke.avcodec_decode_video2(_pDecodingContext, pFrame, &gotPicture, pPacket);
         if (decodedSize < 0)
             Trace.TraceWarning("Error while decoding frame.");
     }
     return gotPicture == 1;
 }

 public bool TryDecode(ref byte[] data, out AVFrame frame)
 {
     int gotPicture;
     frame = new AVFrame();
     fixed (byte* pData = &data[0])
     fixed (AVFrame* pFrame = &frame)
     {
         var packet = new AVPacket {data = pData, size = data.Length};
         int decodedSize = FFmpegInvoke.avcodec_decode_video2(_pDecodingContext, pFrame, &gotPicture, &packet);
         if (decodedSize < 0)
             Trace.TraceWarning("Error while decoding frame.");
     }
     return gotPicture == 1;
 }

 public static extern void av_pkt_dump2(void* f, AVPacket* pkt, int dump_payload, AVStream* st);

 public static extern int av_read_frame(AVFormatContext* s, AVPacket* pkt);

 public static extern int avcodec_encode_video2(AVCodecContext* avctx, AVPacket* avpkt, AVFrame* frame, int* got_packet_ptr);

 public static extern int avcodec_decode_video2(AVCodecContext* avctx, AVFrame* picture, int* got_picture_ptr, AVPacket* avpkt);

 public static extern int avcodec_decode_audio3(AVCodecContext* avctx, short* samples, int* frame_size_ptr, AVPacket* avpkt);

 public static extern int av_packet_copy_props(AVPacket* dst, AVPacket* src);

 public static extern int av_copy_packet_side_data(AVPacket* dst, AVPacket* src);

 public static extern int av_dup_packet(AVPacket* pkt);

 public static extern int av_packet_from_data(AVPacket* pkt, byte* data, int size);

 public static extern int av_grow_packet(AVPacket* pkt, int grow_by);

 public static extern void av_shrink_packet(AVPacket* pkt, int size);

 public static extern int av_new_packet(AVPacket* pkt, int size);

 public static extern void av_packet_unref(AVPacket* pkt);

 public static extern void av_packet_move_ref(AVPacket* dst, AVPacket* src);

 public static extern void av_free_packet(AVPacket* pkt);

 public static extern void av_packet_rescale_ts(AVPacket* pkt, AVRational tb_src, AVRational tb_dst);

 public static extern int av_packet_shrink_side_data(AVPacket* pkt, AVPacketSideDataType type, int size);