avfilter/vf_signature: Dont crash on no frames

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
11 months ago · 3d5f03bbc8
parent bba6df9ac7
commit 3d5f03bbc8
1 changed files with 3 additions and 0 deletions
--- a/libavfilter/vf_signature.c
+++ b/libavfilter/vf_signature.c
@ -379,6 +379,9 @@ 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);