diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
index 9294811d36..ba87211272 100644
--- a/libavfilter/buffersrc.c
+++ b/libavfilter/buffersrc.c
@@ -316,14 +316,16 @@ static av_cold int init_audio(AVFilterContext *ctx)
         return AVERROR(EINVAL);
     }
 
-    if (s->channel_layout_str) {
+    if (s->channel_layout_str || s->channel_layout) {
         int n;
 
-        s->channel_layout = av_get_channel_layout(s->channel_layout_str);
         if (!s->channel_layout) {
-            av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
-                   s->channel_layout_str);
-            return AVERROR(EINVAL);
+            s->channel_layout = av_get_channel_layout(s->channel_layout_str);
+            if (!s->channel_layout) {
+                av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
+                       s->channel_layout_str);
+                return AVERROR(EINVAL);
+            }
         }
         n = av_get_channel_layout_nb_channels(s->channel_layout);
         if (s->channels) {