https://bugs.gentoo.org/834371
https://github.com/performous/performous/commit/c3c0d2b7172
From: Sébastien Gonzalve <sebastien.gonzalve@aliceadsl.fr>
Date: Tue, 3 May 2022 20:26:25 +0200
Subject: [PATCH] Fix ffmpeg compilation on FC36

The new version stats:

2021-04-27 - 46dac8cf3d - lavf 59.0.100 - avformat.h
  av_find_best_stream now uses a const AVCodec ** parameter
  for the returned decoder.

So performous needs a patch to add const when needed.
--- a/game/ffmpeg.cc
+++ b/game/ffmpeg.cc
@@ -251,6 +251,9 @@ FFmpeg::FFmpeg(fs::path const& _filename, int mediaType) : m_filename(_filename)
 	if (err < 0) throw Error(*this, err);
 	m_formatContext->flags |= AVFMT_FLAG_GENPTS;
 	// Find a track and open the codec
+#if (LIBAVFORMAT_VERSION_INT) >= (AV_VERSION_INT(59, 0, 100))
+	const
+#endif
 	AVCodec* codec = nullptr;
 	m_streamId = av_find_best_stream(m_formatContext.get(), static_cast<AVMediaType>(mediaType), -1, -1, &codec, 0);
 	if (m_streamId < 0) throw Error(*this, m_streamId);