---
libavfilter/af_channelmap.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libavfilter/af_channelmap.c b/libavfilter/af_channelmap.c
index 774ee05..5388c58 100644
--- a/libavfilter/af_channelmap.c
+++ b/libavfilter/af_channelmap.c
@@ -270,6 +270,12 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
}
s->output_layout = fmt;
}
+ if (!s->output_layout) {
+ av_log(ctx, AV_LOG_ERROR, "Output channel layout is not set and "
+ "cannot be guessed from the maps.\n");
+ return AVERROR(EINVAL);
+ }
+
ff_add_channel_layout(&s->channel_layouts, s->output_layout);
if (mode == MAP_PAIR_INT_STR || mode == MAP_PAIR_STR_STR) {
--
1.7.10.4
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