tiertexseq: set channel layout

libavformat/tiertexseq.c

@@ -24,6 +24,7 @@
  * Tiertex Limited SEQ file demuxer
  */
 
+#include "libavutil/channel_layout.h"
 #include "avformat.h"
 #include "internal.h"
 
@@ -231,6 +232,7 @@ static int seq_read_header(AVFormatContext *s)
     st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
     st->codec->codec_tag = 0;  /* no tag */
     st->codec->channels = 1;
+    st->codec->channel_layout = AV_CH_LAYOUT_MONO;
     st->codec->sample_rate = SEQ_SAMPLE_RATE;
     st->codec->bits_per_coded_sample = 16;
     st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;