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-rw-r--r--TOOLS/vf_dlopen/framestep.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/TOOLS/vf_dlopen/framestep.c b/TOOLS/vf_dlopen/framestep.c
index 6440fe3139..531d11b018 100644
--- a/TOOLS/vf_dlopen/framestep.c
+++ b/TOOLS/vf_dlopen/framestep.c
@@ -50,6 +50,8 @@ static int framestep_put_image(struct vf_dlopen_context *ctx)
framestep_data_t *framestep = ctx->priv;
// stepping
+ if (framestep->pos < 0)
+ return 0;
--framestep->pos;
if (framestep->pos >= 0)
return 0;