---
 libavfilter/af_join.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavfilter/af_join.c b/libavfilter/af_join.c
index ee87340..e684cb9 100644
--- a/libavfilter/af_join.c
+++ b/libavfilter/af_join.c
@@ -480,6 +480,7 @@ static int join_request_frame(AVFilterLink *outlink)
     frame->nb_samples     = nb_samples;
     frame->channel_layout = outlink->channel_layout;
     frame->sample_rate    = outlink->sample_rate;
+    frame->format         = outlink->format;
     frame->pts            = s->input_frames[0]->pts;
     frame->linesize[0]    = linesize;
     if (frame->data != frame->extended_data) {
-- 
1.9.0

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