avformat/dashenc: Disable writing CODECS tag for HEVC streams

For HEVC streams, only the FourCC tag is written without profile, level etc.,
This is breaking playout support in native Safari.
Native Safari playout expects the full info in CODECS tag or None at all.

libavformat/dashenc.c

@@ -915,6 +915,7 @@ static int write_manifest(AVFormatContext *s, int final)
             AVStream *st = s->streams[i];
             OutputStream *os = &c->streams[i];
             char *agroup = NULL;
+            char *codec_str_ptr = NULL;
             int stream_bitrate = st->codecpar->bit_rate + os->muxer_overhead;
             if (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
                 continue;
@@ -925,10 +926,13 @@ static int write_manifest(AVFormatContext *s, int final)
                 av_strlcat(codec_str, ",", sizeof(codec_str));
                 av_strlcat(codec_str, audio_codec_str, sizeof(codec_str));
             }
+            if (st->codecpar->codec_id != AV_CODEC_ID_HEVC) {
+                codec_str_ptr = codec_str;
+            }
             get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
             ff_hls_write_stream_info(st, c->m3u8_out, stream_bitrate,
                                      playlist_file, agroup,
-                                     codec_str, NULL);
+                                     codec_str_ptr, NULL);
         }
         dashenc_io_close(s, &c->m3u8_out, temp_filename);
         if (use_rename)