mirror of https://git.ffmpeg.org/ffmpeg.git
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>
(cherry picked from commit 68146f06f8
)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -1075,8 +1075,13 @@ static void interpolate(AVFilterLink *inlink, AVFrame *avf_out)
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pts = av_rescale(avf_out->pts, (int64_t) ALPHA_MAX * outlink->time_base.num * inlink->time_base.den,
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(int64_t) outlink->time_base.den * inlink->time_base.num);
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alpha = (pts - mi_ctx->frames[1].avf->pts * ALPHA_MAX) / (mi_ctx->frames[2].avf->pts - mi_ctx->frames[1].avf->pts);
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alpha = av_clip(alpha, 0, ALPHA_MAX);
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if (mi_ctx->frames[2].avf->pts > mi_ctx->frames[1].avf->pts) {
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alpha = (pts - mi_ctx->frames[1].avf->pts * ALPHA_MAX) / (mi_ctx->frames[2].avf->pts - mi_ctx->frames[1].avf->pts);
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alpha = av_clip(alpha, 0, ALPHA_MAX);
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} else {
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av_log(ctx, AV_LOG_DEBUG, "duplicate input PTS detected\n");
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alpha = 0;
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}
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if (alpha == 0 || alpha == ALPHA_MAX) {
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av_frame_copy(avf_out, alpha ? mi_ctx->frames[2].avf : mi_ctx->frames[1].avf);
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