gnu: FFmpeg: Update to 4.3.

* gnu/packages/video.scm (ffmpeg): Update to 4.3.
[source]: Remove obsolete patch.
[inputs]: Add rav1e.
[arguments]: Pass "--enable-librav1e" to #:configure-flags.
(ffmpeg-3.4): Don't build with librav1e.
[inputs]: Remove rav1e.
[arguments]: Remove "--enable-librav1e" from #:configure-flags.
* gnu/packages/patches/ffmpeg-prefer-dav1d.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Remove it.

gnu/local.mk

@@ -917,7 +917,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/fasthenry-spSolve.patch			\
   %D%/packages/patches/fasthenry-spFactor.patch			\
   %D%/packages/patches/fbreader-curl-7.62.patch		\
-  %D%/packages/patches/ffmpeg-prefer-dav1d.patch		\
   %D%/packages/patches/fifengine-swig-compat.patch		\
   %D%/packages/patches/fifo-map-fix-flags-for-gcc.patch		\
   %D%/packages/patches/fifo-map-remove-catch.hpp.patch		\

gnu/packages/patches/ffmpeg-prefer-dav1d.patch

@@ -1,43 +0,0 @@
-When decoding AV1 files, prefer dav1d over libaom for performance
-reasons.
-
-Patch copied from upstream source repository:
-
-<https://git.videolan.org/gitweb.cgi/ffmpeg.git/?p=ffmpeg.git;a=commitdiff;h=dc0806dd25882f41f6085c8356712f95fded56c7>
-
-From dc0806dd25882f41f6085c8356712f95fded56c7 Mon Sep 17 00:00:00 2001
-From: James Almer <jamrial@gmail.com>
-Date: Sun, 15 Sep 2019 11:29:56 -0300
-Subject: [PATCH] avcodec/allcodecs: make libdav1d the preferred AV1 decoder
-
-It's considerably faster than libaom in most systems.
-
-Reviewed-by: BBB
-Signed-off-by: James Almer <jamrial@gmail.com>
----
- libavcodec/allcodecs.c | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
-index 5130fca026..d5dfba1877 100644
---- a/libavcodec/allcodecs.c
-+++ b/libavcodec/allcodecs.c
-@@ -680,7 +680,6 @@ 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_libaom_av1_decoder;
- extern AVCodec ff_libaom_av1_encoder;
- extern AVCodec ff_libaribb24_decoder;
- extern AVCodec ff_libcelt_decoder;
-@@ -738,6 +737,7 @@ extern AVCodec ff_idf_decoder;
- /* external libraries, that shouldn't be used by default if one of the
-  * above is available */
- extern AVCodec ff_h263_v4l2m2m_encoder;
-+extern AVCodec ff_libaom_av1_decoder;
- extern AVCodec ff_libopenh264_encoder;
- extern AVCodec ff_libopenh264_decoder;
- extern AVCodec ff_h264_amf_encoder;
--- 
-2.20.1
-

gnu/packages/video.scm

@@ -937,16 +937,14 @@ (define-public libva-utils
 (define-public ffmpeg
   (package
     (name "ffmpeg")
-    (version "4.2.3")
+    (version "4.3")
     (source (origin
              (method url-fetch)
              (uri (string-append "https://ffmpeg.org/releases/ffmpeg-"
                                  version ".tar.xz"))
-             ;; See <https://issues.guix.gnu.org/issue/39719>
-             (patches (search-patches "ffmpeg-prefer-dav1d.patch"))
              (sha256
               (base32
-               "0cddkb5sma9dzy8i59sfls19rhjlq40zn9mh3x666dqkxl5ckxlx"))))
+               "0pbrsv5v96yd8qzb9bk4kw7qk4xqpi03rsd5xfbwnjzlhijd02hx"))))
     (build-system gnu-build-system)
     (inputs
      `(("dav1d" ,dav1d)
@@ -973,6 +971,7 @@ (define-public ffmpeg
        ("mesa" ,mesa)
        ("openal" ,openal)
        ("pulseaudio" ,pulseaudio)
+       ("rav1e" ,rav1e)
        ("sdl" ,sdl2)
        ("soxr" ,soxr)
        ("speex" ,speex)
@@ -1054,6 +1053,7 @@ (define-public ffmpeg
          "--enable-libmp3lame"
          "--enable-libopus"
          "--enable-libpulse"
+         "--enable-librav1e"
          "--enable-libsoxr"
          "--enable-libspeex"
          "--enable-libtheora"
@@ -1132,10 +1132,10 @@ (define-public ffmpeg-3.4
     (arguments
      (substitute-keyword-arguments (package-arguments ffmpeg)
        ((#:configure-flags flags)
-        `(delete "--enable-libdav1d" (delete "--enable-libaom"
-                 ,flags)))))
-    (inputs (alist-delete "dav1d" (alist-delete "libaom"
-                          (package-inputs ffmpeg))))))
+        `(delete "--enable-libdav1d" (delete "--enable-libaom" (delete "--enable-librav1e"
+                  ,flags))))))
+    (inputs (alist-delete "dav1d" (alist-delete "libaom" (alist-delete "rav1e"
+                           (package-inputs ffmpeg)))))))
 
 (define-public ffmpeg-for-stepmania
   (hidden-package