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avfilter/xpsnr: avoid division by zero

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The ref input may have its frame rate unset, which would then lead to
SIGFPE. So fall back to the main link frame rate. If that too is unset,
default to 0.

Related to #11428
This commit is contained in:
Gyan Doshi
2025-01-27 10:54:07 +05:30
parent 779a3187a8
commit 6da82b4485
1 changed files with 4 additions and 1 deletions
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5
libavfilter/vf_xpsnr.c
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@ -552,6 +552,7 @@ static int config_input_ref(AVFilterLink *inlink)
AVFilterContext *ctx = inlink->dst;
XPSNRContext *const s = ctx->priv;
FilterLink *il = ff_filter_link(inlink);
FilterLink *ml = ff_filter_link(ctx->inputs[0]);
if ((ctx->inputs[0]->w != ctx->inputs[1]->w) ||
(ctx->inputs[0]->h != ctx->inputs[1]->h)) {
@ -568,7 +569,9 @@ static int config_input_ref(AVFilterLink *inlink)
s->max_error_64 = (1 << s->depth) - 1; /* conventional limit */
s->max_error_64 *= s->max_error_64;
s->frame_rate = il->frame_rate.num / il->frame_rate.den;
// Avoid division by zero
s->frame_rate = il->frame_rate.den ? (il->frame_rate.num / il->frame_rate.den) :
ml->frame_rate.den ? (ml->frame_rate.num / ml->frame_rate.den) : 0;
s->num_comps = (desc->nb_components > 3 ? 3 : desc->nb_components);