avformat/nutenc: store the actual r_frame_rate in the corresponding field if available

Fixes Ticket 3629 part3
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/nutenc.c

@@ -524,6 +524,9 @@ static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id) {
     }
     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
         uint8_t buf[256];
+        if (st->r_frame_rate.num>0 && st->r_frame_rate.den>0)
+            snprintf(buf, sizeof(buf), "%d/%d", st->r_frame_rate.num, st->r_frame_rate.den);
+        else
             snprintf(buf, sizeof(buf), "%d/%d", st->codec->time_base.den, st->codec->time_base.num);
         count += add_info(dyn_bc, "r_frame_rate", buf);
     }

libavformat/version.h

@@ -31,7 +31,7 @@
 
 #define LIBAVFORMAT_VERSION_MAJOR 56
 #define LIBAVFORMAT_VERSION_MINOR  15
-#define LIBAVFORMAT_VERSION_MICRO 104
+#define LIBAVFORMAT_VERSION_MICRO 105
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \