add debug msg

cgo/ffmpeg/ffmpeg.c

@@ -5,6 +5,7 @@
 #include <libswresample/swresample.h>
 #include <libavutil/opt.h>
 #include <string.h>
+#include <stdio.h>
 #include <libswscale/swscale.h>
 #include "ffmpeg.h"
 
@@ -15,6 +16,9 @@ int decode(AVCodecContext *avctx, AVFrame *frame, uint8_t *data, int size, int *
 
     *got_frame = 0;
     
+	printf("avctx: %p", avctx)
+	printf("avctx->internal: %p", avctx->internal)
+
     ret = avcodec_send_packet(avctx, &pkt);
     
     av_packet_unref(&pkt);