From ea9557043e9e23a0b7e9709fbb2b2668d00522ef Mon Sep 17 00:00:00 2001
From: Niklas Haas <git@haasn.dev>
Date: Fri, 27 Oct 2023 16:59:40 +0200
Subject: [PATCH] avfilter/vf_alphamerge: warn if input not full range

Alpha planes must always be full range, so complain loudly if fed
limited range grayscale input.
---
 libavfilter/vf_alphamerge.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavfilter/vf_alphamerge.c b/libavfilter/vf_alphamerge.c
index 4bbc06da36..a5f5baf77e 100644
--- a/libavfilter/vf_alphamerge.c
+++ b/libavfilter/vf_alphamerge.c
@@ -60,6 +60,12 @@ static int do_alphamerge(FFFrameSync *fs)
     if (!alpha_buf)
         return ff_filter_frame(ctx->outputs[0], main_buf);
 
+    if (alpha_buf->color_range == AVCOL_RANGE_MPEG) {
+        av_log(ctx, AV_LOG_WARNING, "alpha plane color range tagged as %s, "
+               "output will be wrong!\n",
+               av_color_range_name(alpha_buf->color_range));
+    }
+
     if (s->is_packed_rgb) {
         int x, y;
         uint8_t *pin, *pout;