Added SDL2 FFmpeg player that actually works, source: years of trial and error

dev-libs/sdl-kitchensink/Manifest

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+DIST sdl-kitchensink-1.0.7.tar.gz 69854 BLAKE2B 33cd38bf9e5dbb3eaf3750af1680dd6d5daf4f8b951cfdfaf3ca2719651cc3498db08ee729a80cf8562b1062923f005979ab1970c11534174b468a453e93d552 SHA512 0f8970ff88ed78bcaf0bdc08ce7f7871d538d7d442e3047cf834866c7deb77c3fadbb97c9e67d3b032d8314f62676f4ad913fb4cee45901381914f50a11d6b51

dev-libs/sdl-kitchensink/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+  <use>
+    <flag name="sanitize">
+      Use sanitizer functions (ASAN/TSAN/etc...)
+    </flag>
+    <flag name="static">
+      Build static libraries
+    </flag>
+    <flag name="examples">
+      Build examples. If static is also set, examples will be linked against static library
+    </flag>
+  </use>
+</pkgmetadata>

dev-libs/sdl-kitchensink/sdl-kitchensink-1.0.7.ebuild

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+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake-utils
+
+DESCRIPTION="A Simple SDL2 / FFmpeg library for audio/video playback written in C99"
+HOMEPAGE="https://github.com/katajakasa/SDL_kitchensink"
+SRC_URI="https://github.com/katajakasa/SDL_kitchensink/archive/${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="~amd64 ~arm ~ppc64 ~x86"
+
+IUSE="static sanitize examples"
+
+BDEPEND+="
+	!static? ( sys-apps/findutils )
+	examples? ( sys-apps/coreutils )
+"
+
+RDEPEND+="
+	sanitize? ( sys-devel/gcc[sanitize] )
+	media-libs/libsdl2
+	media-video/ffmpeg[libass]
+"
+
+#S="${S}/${PN}"
+S="${WORKDIR}/SDL_kitchensink-${PV}"
+
+src_prepare() {
+	cmake-utils_src_prepare
+}
+
+src_configure() {
+	SANITIZE="OFF"
+	EXAMPLES="OFF"
+	if use sanitize; then SANITIZE="ON"; fi
+	if use examples; then EXAMPLES="ON"; fi
+	local mycmakeargs=(
+		-DUSE_ASAN="${SANITIZE}"
+		-DBUILD_EXAMPLES="${EXAMPLES}"
+	)
+	cmake-utils_src_configure
+}
+
+src_install() {
+	cmake-utils_src_install
+	if ! use static; then
+		elog "Removing static library libSDL_kitchensink_static.a"
+		find "${D}" -name libSDL_kitchensink_static.a -delete
+	fi
+	if use examples; then
+		for i in audio complex custom rwops simple; do
+			elog "Installing example: ${i}"
+			mv "${BUILD_DIR}"/${i} "${BUILD_DIR}"/SDL_kitchensink-${i}
+			dobin "${BUILD_DIR}"/SDL_kitchensink-${i}
+		done
+		if use static; then
+			elog "Examples are linked against static SDL_kitchensink library."
+		fi
+	fi
+}