From 12b4ab5d4d9e4fe8f25d9729048e73488d9e49d2 Mon Sep 17 00:00:00 2001
From: Niklas Haas <git@haasn.dev>
Date: Fri, 18 Nov 2022 16:11:25 +0100
Subject: [PATCH] avfilter/vf_libplacebo: fix output format selection

After commit c0b93, it's possible that `ff_vk_filter_config_input` never
gets called, leading to `s->vkctx.input_format` being left unset. This
broke the format auto-selection logic in `libplacebo_config_output`,
resulting in a default to yuv420p, instead of defaulting to the input
format as intended.

Fixes: c0b93c4f8be48e2abad1eb5358643a01b9e27613
---
 libavfilter/vf_libplacebo.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavfilter/vf_libplacebo.c b/libavfilter/vf_libplacebo.c
index 65865b7811..92f859fd94 100644
--- a/libavfilter/vf_libplacebo.c
+++ b/libavfilter/vf_libplacebo.c
@@ -551,9 +551,15 @@ fail:
 
 static int libplacebo_config_input(AVFilterLink *inlink)
 {
+    AVFilterContext *avctx = inlink->dst;
+    LibplaceboContext *s   = avctx->priv;
+
     if (inlink->format == AV_PIX_FMT_VULKAN)
         return ff_vk_filter_config_input(inlink);
 
+    /* Forward this to the vkctx for format selection */
+    s->vkctx.input_format = inlink->format;
+
     return 0;
 }