diff --git a/pkgs/development/libraries/ffmpeg-full/default.nix b/pkgs/development/libraries/ffmpeg-full/default.nix
index 65a48890e496..84cadef2ab95 100644
--- a/pkgs/development/libraries/ffmpeg-full/default.nix
+++ b/pkgs/development/libraries/ffmpeg-full/default.nix
@@ -52,6 +52,7 @@
 , bzip2 ? null
 , celt ? null # CELT decoder
 #, crystalhd ? null # Broadcom CrystalHD hardware acceleration
+, dav1d ? null # AV1 decoder (focused on speed and correctness)
 #, decklinkExtlib ? false, blackmagic-design-desktop-video ? null # Blackmagic Design DeckLink I/O support
 , fdkaacExtlib ? false, fdk_aac ? null # Fraunhofer FDK AAC de/encoder
 #, flite ? null # Flite (voice synthesis) support
@@ -234,17 +235,14 @@ assert opensslExtlib -> gnutls == null && openssl != null && nonfreeLicensing;
 
 stdenv.mkDerivation rec {
   name = "ffmpeg-full-${version}";
-  version = "4.1.4";
+  version = "4.2";
 
   src = fetchurl {
     url = "https://www.ffmpeg.org/releases/ffmpeg-${version}.tar.xz";
-    sha256 = "1qd7a10gs12ifcp31gramcgqjl77swskjfp7cijibgyg5yl4kw7i";
+    sha256 = "1mgcxm7sqkajx35px05szsmn9mawwm03cfpmk3br7bcp3a1i0gq2";
   };
-  patches = [(fetchpatch { # remove on update
-    name = "fix-hardcoded-tables.diff";
-    url = "http://git.ffmpeg.org/gitweb/ffmpeg.git/commitdiff_plain/c8232e50074f";
-    sha256 = "0jlksks4fjajby8fjk7rfp414gxfdgd6q9khq26i52xvf4kg2dw6";
-  })];
+
+  patches = [ ./prefer-libdav1d-over-libaom.patch ];
 
   prePatch = ''
     patchShebangs .
@@ -327,6 +325,7 @@ stdenv.mkDerivation rec {
     (enableFeature (bzip2 != null) "bzlib")
     (enableFeature (celt != null) "libcelt")
     #(enableFeature crystalhd "crystalhd")
+    (enableFeature (dav1d != null) "libdav1d")
     #(enableFeature decklinkExtlib "decklink")
     (enableFeature (fdkaacExtlib && gplLicensing) "libfdk-aac")
     #(enableFeature (flite != null) "libflite")
@@ -414,7 +413,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ perl pkgconfig texinfo yasm ];
 
   buildInputs = [
-    bzip2 celt fontconfig freetype frei0r fribidi game-music-emu gnutls gsm
+    bzip2 celt dav1d fontconfig freetype frei0r fribidi game-music-emu gnutls gsm
     libjack2 ladspaH lame libaom libass libbluray libbs2b libcaca libdc1394 libmodplug libmysofa
     libogg libopus libssh libtheora libvdpau libvorbis libvpx libwebp libX11
     libxcb libXv libXext lzma openal openjpeg libpulseaudio rtmpdump opencore-amr
diff --git a/pkgs/development/libraries/ffmpeg-full/prefer-libdav1d-over-libaom.patch b/pkgs/development/libraries/ffmpeg-full/prefer-libdav1d-over-libaom.patch
new file mode 100644
index 000000000000..789bfc2674fa
--- /dev/null
+++ b/pkgs/development/libraries/ffmpeg-full/prefer-libdav1d-over-libaom.patch
@@ -0,0 +1,19 @@
+diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
+index d2f9a39ce5..2342399a8e 100644
+--- a/libavcodec/allcodecs.c
++++ b/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;