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avfilter/vf_minterpolate: Check pts before division 

Fixes: FPE
Fixes: tickets/10758/poc20ffmpeg

Discovered by Zeng Yunxiang

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-12-30 02:51:32 +01:00
parent 08bd2cbfeb
commit 68146f06f8
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GPG Key ID: B18E8928B3948D64
1 changed files with 7 additions and 2 deletions
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9
libavfilter/vf_minterpolate.c
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@ -1075,8 +1075,13 @@ static void interpolate(AVFilterLink *inlink, AVFrame *avf_out)
pts = av_rescale(avf_out->pts, (int64_t) ALPHA_MAX * outlink->time_base.num * inlink->time_base.den,
(int64_t) outlink->time_base.den * inlink->time_base.num);
alpha = (pts - mi_ctx->frames[1].avf->pts * ALPHA_MAX) / (mi_ctx->frames[2].avf->pts - mi_ctx->frames[1].avf->pts);
alpha = av_clip(alpha, 0, ALPHA_MAX);
if (mi_ctx->frames[2].avf->pts > mi_ctx->frames[1].avf->pts) {
alpha = (pts - mi_ctx->frames[1].avf->pts * ALPHA_MAX) / (mi_ctx->frames[2].avf->pts - mi_ctx->frames[1].avf->pts);
alpha = av_clip(alpha, 0, ALPHA_MAX);
} else {
av_log(ctx, AV_LOG_DEBUG, "duplicate input PTS detected\n");
alpha = 0;
}
if (alpha == 0 || alpha == ALPHA_MAX) {
av_frame_copy(avf_out, alpha ? mi_ctx->frames[2].avf : mi_ctx->frames[1].avf);