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[FFmpeg-devel,2/2] avfilter/vf_libplacebo: fix normalize_sar calculation

Message ID 20221118142512.72413-2-ffmpeg@haasn.xyz
State Accepted
Commit 46a4cc460edfaff8e5b88198a7127a910a5ab72f
Headers show
Series [FFmpeg-devel,1/2] avfilter/vf_libplacebo: default to normalize_sar=0 | expand


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Commit Message

Niklas Haas Nov. 18, 2022, 2:25 p.m. UTC
From: Niklas Haas <git@haasn.dev>

This previous expression multiplied a constant (outlink->h) that was
guaranteed to be 0 at this point, thus making it always a no-op.

Fix the calculation, and also properly reset the SAR to 1:1 as is now
necessary (the failure to do so previously hid this bug's existence).
 libavfilter/vf_libplacebo.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/libavfilter/vf_libplacebo.c b/libavfilter/vf_libplacebo.c
index d52833263d..921cdb36fd 100644
--- a/libavfilter/vf_libplacebo.c
+++ b/libavfilter/vf_libplacebo.c
@@ -576,12 +576,13 @@  static int libplacebo_config_output(AVFilterLink *outlink)
-    scale_sar = (AVRational){outlink->h * inlink->w, *out_w * *out_h};
+    scale_sar = (AVRational){*out_h * inlink->w, *out_w * inlink->h};
     if (inlink->sample_aspect_ratio.num)
         scale_sar = av_mul_q(scale_sar, inlink->sample_aspect_ratio);
     if (s->normalize_sar) {
         /* Apply all SAR during scaling, so we don't need to set the out SAR */
+        outlink->sample_aspect_ratio = (AVRational){ 1, 1 };
         s->target_sar = scale_sar;
     } else {
         /* This is consistent with other scale_* filters, which only