From 7361aaeb5ed2e301018ec33a3a18f0865cd384b2 Mon Sep 17 00:00:00 2001
From: Robert Scott <code@humanleg.org.uk>
Date: Tue, 17 Aug 2021 22:55:39 +0100
Subject: [PATCH] ffmpeg: enable basic tests

(cherry picked from commit 649f0ed1a88f6e4cf00705b1cb2f1fbdf1fb780c)
---
 pkgs/development/libraries/ffmpeg/2.8.nix     |  1 +
 pkgs/development/libraries/ffmpeg/generic.nix | 11 +++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/libraries/ffmpeg/2.8.nix b/pkgs/development/libraries/ffmpeg/2.8.nix
index 6d94c2e9974..0df810ff10b 100644
--- a/pkgs/development/libraries/ffmpeg/2.8.nix
+++ b/pkgs/development/libraries/ffmpeg/2.8.nix
@@ -7,4 +7,5 @@ callPackage ./generic.nix (rec {
   knownVulnerabilities = [
     "CVE-2021-30123"
   ];
+  doCheck = false;
 } // args)
diff --git a/pkgs/development/libraries/ffmpeg/generic.nix b/pkgs/development/libraries/ffmpeg/generic.nix
index 7e4a6a08098..083210b1fef 100644
--- a/pkgs/development/libraries/ffmpeg/generic.nix
+++ b/pkgs/development/libraries/ffmpeg/generic.nix
@@ -17,7 +17,8 @@
 # Darwin frameworks
 , Cocoa, darwinFrameworks ? [ Cocoa ]
 # Inherit generics
-, branch, sha256, version, patches ? [], knownVulnerabilities ? [], ...
+, branch, sha256, version, patches ? [], knownVulnerabilities ? []
+, doCheck ? true, ...
 }:
 
 /* Maintainer notes:
@@ -187,7 +188,13 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  doCheck = false; # fails
+  inherit doCheck;
+  checkPhase = let
+    ldLibraryPathEnv = if stdenv.isDarwin then "DYLD_LIBRARY_PATH" else "LD_LIBRARY_PATH";
+  in ''
+    ${ldLibraryPathEnv}="libavcodec:libavdevice:libavfilter:libavformat:libavresample:libavutil:libpostproc:libswresample:libswscale:''${${ldLibraryPathEnv}}" \
+      make check -j$NIX_BUILD_CORES
+  '';
 
   # ffmpeg 3+ generates pkg-config (.pc) files that don't have the
   # form automatically handled by the multiple-outputs hooks.