16Jun2020/22:55 < zaitor:#opensuse-factory> fyi, when you or someone else bumps
ffmpeg to 4.3 release, the prefer-dav1d.patch should be dropped, upstream
solved it in a more elegant way than that patch

Index: ffmpeg-4.2.1/libavcodec/allcodecs.c
===================================================================
--- ffmpeg-4.2.1.orig/libavcodec/allcodecs.c
+++ ffmpeg-4.2.1/libavcodec/allcodecs.c
@@ -679,13 +679,13 @@ extern AVCodec ff_pcm_mulaw_at_encoder;
 extern AVCodec ff_pcm_mulaw_at_decoder;
 extern AVCodec ff_qdmc_at_decoder;
 extern AVCodec ff_qdm2_at_decoder;
+extern AVCodec ff_libdav1d_decoder;
 extern AVCodec ff_libaom_av1_decoder;
 extern AVCodec ff_libaom_av1_encoder;
 extern AVCodec ff_libaribb24_decoder;
 extern AVCodec ff_libcelt_decoder;
 extern AVCodec ff_libcodec2_encoder;
 extern AVCodec ff_libcodec2_decoder;
-extern AVCodec ff_libdav1d_decoder;
 extern AVCodec ff_libdavs2_decoder;
 extern AVCodec ff_libfdk_aac_encoder;
 extern AVCodec ff_libfdk_aac_decoder;