Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> --- libavfilter/vf_signature.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavfilter/vf_signature.c b/libavfilter/vf_signature.c index 4896e8f2c11..53ed413a4ce 100644 --- a/libavfilter/vf_signature.c +++ b/libavfilter/vf_signature.c @@ -384,6 +384,9 @@ static int xml_export(AVFilterContext *ctx, StreamContext *sc, const char* filen FILE* f; unsigned int pot3[5] = { 3*3*3*3, 3*3*3, 3*3, 3, 1 }; + if (!sc->coarseend->last) + return AVERROR(EINVAL); // No frames ? + f = avpriv_fopen_utf8(filename, "w"); if (!f) { int err = AVERROR(EINVAL); -- 2.17.1