ffmpeg support on linux, and check compiled vs. runtime versions of ffmpeg

ffmpeg-audio/demo_ffmpeg_audio.c

@@ -4,6 +4,13 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+#include <libavutil/avutil.h>
+#include <libavutil/channel_layout.h>
+#include <libavutil/samplefmt.h>
+#include <libswresample/swresample.h>
+
 #ifdef WIN32
 #define fprintf fprintf_s
 #endif
@@ -97,6 +104,11 @@ int main(int argc, char **argv)
     infile = argv[1];
     outfile = argv[2];
 
+    fprintf(stderr, "ffmpeg compiled version: %s\n", fmpg_ffmpeg_version());
+    fprintf(stderr, "ffmpeg runtime version avformat: %d - %s\n", avformat_version(), fmpg_int_version2string(avformat_version()));
+
+    //fprintf(stderr, "ffmpeg runtme config string: %s\n", avformat_configuration());
+
     fmpg = fmpg_init();
     if (!fmpg) {
         fprintf(stderr, "fmpg_init failed\n");