dashenc: Don't output frameRates at both AS and Representation-level. Only output maxFrameRate at AS-level.

Fix conformance regarding section "3.2.4. Presence of Attributes and
Element" of the "Guidelines for Implementation: DASH-IF Interoperability
Points V4.1" (http://dashif.org/guidelines/)

Signed-off-by: Anton Schubert <ischluff@mailbox.org>
Signed-off-by: Peter Große <pegro@friiks.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/dashenc.c

@@ -393,8 +393,8 @@ static int write_adaptation_set(AVFormatContext *s, AVIOContext *out, int as_ind
 
     avio_printf(out, "\t\t<AdaptationSet id=\"%s\" contentType=\"%s\" segmentAlignment=\"true\" bitstreamSwitching=\"true\"",
                 as->id, as->media_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
-    if (as->media_type == AVMEDIA_TYPE_VIDEO && as->max_frame_rate.num && !as->ambiguous_frame_rate)
-        avio_printf(out, " %s=\"%d/%d\"", (av_cmp_q(as->min_frame_rate, as->max_frame_rate) < 0) ? "maxFrameRate" : "frameRate", as->max_frame_rate.num, as->max_frame_rate.den);
+    if (as->media_type == AVMEDIA_TYPE_VIDEO && as->max_frame_rate.num && !as->ambiguous_frame_rate && av_cmp_q(as->min_frame_rate, as->max_frame_rate) < 0)
+        avio_printf(out, " maxFrameRate=\"%d/%d\"", as->max_frame_rate.num, as->max_frame_rate.den);
     lang = av_dict_get(as->metadata, "language", NULL, 0);
     if (lang)
         avio_printf(out, " lang=\"%s\"", lang->value);