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| author | Michael Niedermayer <michael@niedermayer.cc> | 2023-12-30 02:51:32 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2023-12-30 21:50:04 +0100 |
| commit | 68146f06f852078866b3ef1564556e3a272920c7 (patch) | |
| tree | 19dd5a08953d37e97bc0156e07f43f5441b74e9c | |
| parent | 08bd2cbfeb34717d60ec62bcbaeb7996206df906 (diff) | |
| download | ffmpeg-68146f06f852078866b3ef1564556e3a272920c7.tar.gz | |
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>
| -rw-r--r-- | libavfilter/vf_minterpolate.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/libavfilter/vf_minterpolate.c b/libavfilter/vf_minterpolate.c index 9920210ece..b2242a15ee 100644 --- a/libavfilter/vf_minterpolate.c +++ b/libavfilter/vf_minterpolate.c @@ -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); |