diff --git a/ffmpeg.c b/ffmpeg.c
index 4c5bf13..c6b00d5 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -1096,9 +1096,12 @@ need_realloc:
                 av_opt_set_int(ost->swr, "icl", av_get_default_channel_layout(ost->audio_channels_mapped), 0);
                 av_opt_set_int(ost->swr, "uch", ost->audio_channels_mapped, 0);
             }
-            av_opt_set_int(ost->swr, "ich", dec->channels, 0);
-            if (av_opt_set_int(ost->swr, "och", enc->channels, 0)<0) {
-                av_log(NULL, AV_LOG_FATAL, "Too many output channels\n");
+            if (av_opt_set_int(ost->swr, "ich", dec->channels, 0) < 0) {
+                av_log(NULL, AV_LOG_FATAL, "Unsupported number of inputput channels\n");
+                exit_program(1);
+            }
+            if (av_opt_set_int(ost->swr, "och", enc->channels, 0) < 0) {
+                av_log(NULL, AV_LOG_FATAL, "Unsupported number of output channels\n");
                 exit_program(1);
             }
             if(audio_sync_method>1) av_opt_set_int(ost->swr, "flags", SWR_FLAG_RESAMPLE, 0);