@@ -68,9 +68,9 @@ typedef struct {

         av_log(s, AV_LOG_INFO, "Changing frame properties on the fly is not supported by all filters.\n");\

     }

-#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, format)\

+#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format)\

     if (c->sample_fmt != format || c->sample_rate != srate ||\

-        c->channel_layout != ch_layout) {\

+        c->channel_layout != ch_layout || c->channels != ch_count) {\

         av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\

         return AVERROR(EINVAL);\

     }

@@ -138,7 +138,7 @@ static int attribute_align_arg av_buffersrc_add_frame_internal(AVFilterContext *

         if (!frame->channel_layout)

             frame->channel_layout = s->channel_layout;

         CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,

-                                 frame->format);

+                                 av_frame_get_channels(frame), frame->format);

         break;

     default:

         return AVERROR(EINVAL);