---
fftools/ffmpeg_filter.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
index 60e09866af..432e2fced9 100644
--- a/fftools/ffmpeg_filter.c
+++ b/fftools/ffmpeg_filter.c
@@ -595,6 +595,8 @@ static int ifilter_bind_ist(InputFilter *ifilter,
InputStream *ist)
InputFilterPriv *ifp = ifp_from_ifilter(ifilter);
int ret;
+ av_assert0(!ifp->ist);
+
ifp->ist = ist;
ifp->type_src = ist->st->codecpar->codec_type;
@@ -654,6 +656,8 @@ void ofilter_bind_ost(OutputFilter *ofilter, OutputStream
*ost)
FilterGraph *fg = ofilter->graph;
const AVCodec *c = ost->enc_ctx->codec;
+ av_assert0(!ofilter->ost);
+
ofilter->ost = ost;
av_freep(&ofilter->linklabel);
--
2.40.1
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