diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 26c5645f0a..1cec213749 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -1072,9 +1072,14 @@ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
         }
         if (enc->width) {
             snprintf(buf + strlen(buf), buf_size - strlen(buf),
-                     ", %dx%d, %0.2f fps",
-                     enc->width, enc->height, 
-                     1/av_q2d(enc->time_base));
+                     ", %dx%d",
+                     enc->width, enc->height);
+            if(av_log_get_level() >= AV_LOG_DEBUG){
+                int g= ff_gcd(enc->time_base.num, enc->time_base.den);
+                snprintf(buf + strlen(buf), buf_size - strlen(buf),
+                     ", %d/%d",
+                     enc->time_base.num/g, enc->time_base.den/g);
+            }
         }
         if (encode) {
             snprintf(buf + strlen(buf), buf_size - strlen(buf),
diff --git a/libavformat/utils.c b/libavformat/utils.c
index edac0b877d..c49547cdb5 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2598,6 +2598,7 @@ void dump_format(AVFormatContext *ic,
     }
     for(i=0;i<ic->nb_streams;i++) {
         AVStream *st = ic->streams[i];
+        int g= ff_gcd(st->time_base.num, st->time_base.den);
         avcodec_string(buf, sizeof(buf), st->codec, is_output);
         av_log(NULL, AV_LOG_INFO, "  Stream #%d.%d", index, i);
         /* the pid is an important information, so we display it */
@@ -2612,6 +2613,10 @@ void dump_format(AVFormatContext *ic,
         if (strlen(st->language) > 0) {
             av_log(NULL, AV_LOG_INFO, "(%s)", st->language);
         }
+        av_log(NULL, AV_LOG_DEBUG, ", %d/%d", st->time_base.num/g, st->time_base.den/g);
+        if(st->codec->codec_type == CODEC_TYPE_VIDEO){
+            av_log(NULL, AV_LOG_INFO, ", %5.2f fps", av_q2d(st->r_frame_rate));
+        }
         av_log(NULL, AV_LOG_INFO, ": %s\n", buf);
     }
 }