Overriding unknown layouts with the negotiated layout is OK, but the number of
channels should match with what was negotiated.

Signed-off-by: Marton Balint <c...@passwd.hu>
---
 libavfilter/buffersrc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
index 130751775a..3ea3ca92c9 100644
--- a/libavfilter/buffersrc.c
+++ b/libavfilter/buffersrc.c
@@ -215,7 +215,7 @@ int attribute_align_arg 
av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFra
             break;
         case AVMEDIA_TYPE_AUDIO:
             /* For layouts unknown on input but known on link after 
negotiation. */
-            if (frame->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC) {
+            if (frame->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC && 
frame->ch_layout.nb_channels == s->ch_layout.nb_channels) {
                 ret = av_channel_layout_copy(&frame->ch_layout, &s->ch_layout);
                 if (ret < 0)
                     return ret;
-- 
2.35.3

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