avformat/dashenc: Use local variable instead of duplicated dereferences

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/dashenc.c

@@ -498,7 +498,8 @@ static int write_manifest(AVFormatContext *s, int final)
         for (i = 0; i < s->nb_streams; i++) {
             AVStream *st = s->streams[i];
             OutputStream *os = &c->streams[i];
-            if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_VIDEO)
+
+            if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO)
                 continue;
             avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"video/mp4\" codecs=\"%s\"%s width=\"%d\" height=\"%d\">\n", i, os->codec_str, os->bandwidth_str, st->codec->width, st->codec->height);
             output_segment_list(&c->streams[i], out, c);
@@ -511,7 +512,8 @@ static int write_manifest(AVFormatContext *s, int final)
         for (i = 0; i < s->nb_streams; i++) {
             AVStream *st = s->streams[i];
             OutputStream *os = &c->streams[i];
-            if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
+
+            if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO)
                 continue;
             avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"audio/mp4\" codecs=\"%s\"%s audioSamplingRate=\"%d\">\n", i, os->codec_str, os->bandwidth_str, st->codec->sample_rate);
             avio_printf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", st->codec->channels);