diff --git a/pkgs/development/libraries/gstreamer/bad/default.nix b/pkgs/development/libraries/gstreamer/bad/default.nix
index 8179806859c..a3f2233b9bc 100644
--- a/pkgs/development/libraries/gstreamer/bad/default.nix
+++ b/pkgs/development/libraries/gstreamer/bad/default.nix
@@ -1,10 +1,40 @@
 { stdenv, fetchurl, fetchpatch, meson, ninja, gettext
+, config
 , pkgconfig, python3, gst-plugins-base, orc
+, gobject-introspection
 , faacSupport ? false, faac ? null
 , faad2, libass, libkate, libmms, librdf, ladspaH
 , libnice, webrtc-audio-processing, lilv, lv2, serd, sord, sratom
 , libbs2b, libmodplug, mpeg2dec
 , openjpeg, libopus, librsvg
+, bluez
+, chromaprint
+, curl
+, directfb
+, fdk_aac
+, flite
+, libaom
+, libdc1394
+, libde265
+, libdrm
+, libdvdnav
+, libdvdread
+, libgudev
+, libofa
+, libsndfile
+, libusb1
+, neon
+, openal
+, opencv3
+, openexr
+, openh264
+, pango
+, sbc
+, soundtouch
+, spandsp
+, srtp
+, zbar
+, wayland-protocols
 , wildmidi, fluidsynth, libvdpau, wayland
 , libwebp, xvidcore, gnutls, mjpegtools
 , libGLU_combined, libintl, libgme
@@ -15,11 +45,11 @@
 assert faacSupport -> faac != null;
 
 let
-  inherit (stdenv.lib) optional;
+  inherit (stdenv.lib) optional optionals;
 in
 stdenv.mkDerivation rec {
   name = "gst-plugins-bad-${version}";
-  version = "1.14.4";
+  version = "1.15.1";
 
   meta = with stdenv.lib; {
     description = "Gstreamer Bad Plugins";
@@ -40,27 +70,22 @@ stdenv.mkDerivation rec {
   '';
 
   patches = [
-    (fetchpatch {
-        url = "https://bug794856.bugzilla-attachments.gnome.org/attachment.cgi?id=370409";
-        sha256 = "0hy0rcn35alq65yqwri4fqjz2hf3nyyg5c7rnndk51msmqjxpprk";
-    })
     ./fix_pkgconfig_includedir.patch
-    # Enable bs2b compilation
-    # https://bugzilla.gnome.org/show_bug.cgi?id=794346
-    (fetchurl {
-      url = https://bugzilla.gnome.org/attachment.cgi?id=369724;
-      sha256 = "1716mp0h2866ab33w607isvfhv1zwyj71qb4jrkx5v0h276v1pwr";
-    })
   ];
 
   src = fetchurl {
     url = "${meta.homepage}/src/gst-plugins-bad/${name}.tar.xz";
-    sha256 = "1r8dma3x127rbx42yab7kwq7q1bhkmvz2ykn0rnqnzl95q74w2wi";
+    sha256 = "0dpky8a0pbwwkc5r8hawi5yizdqk65j9liwvhxkjwbnpv53n5y10";
   };
 
   outputs = [ "out" "dev" ];
 
-  nativeBuildInputs = [ meson ninja pkgconfig python3 gettext ];
+  nativeBuildInputs = [
+    meson ninja pkgconfig python3 gettext gobject-introspection
+  ]
+  ++ optionals stdenv.isLinux [
+    wayland-protocols
+  ];
 
   buildInputs = [
     gst-plugins-base orc
@@ -71,6 +96,33 @@ stdenv.mkDerivation rec {
     lilv lv2 serd sord sratom # lv2 plug-in
     libmodplug mpeg2dec
     openjpeg libopus librsvg
+    bluez
+    chromaprint
+    curl.dev
+    directfb
+    fdk_aac
+    flite
+    libaom
+    libdc1394
+    libde265
+    libdrm
+    libdvdnav
+    libdvdread
+    libgudev
+    libofa
+    libsndfile
+    libusb1
+    neon
+    openal
+    opencv3
+    openexr
+    openh264
+    pango
+    sbc
+    soundtouch
+    spandsp
+    srtp
+    zbar
     fluidsynth libvdpau
     libwebp xvidcore gnutls libGLU_combined
     libgme openssl x265 libxml2
@@ -85,6 +137,48 @@ stdenv.mkDerivation rec {
     # TODO: mjpegtools uint64_t is not compatible with guint64 on Darwin
     ++ optional (!stdenv.isDarwin) mjpegtools;
 
+  mesonFlags = [
+    # Enables all features, so that we know when new dependencies are necessary.
+    "-Dauto_features=enabled"
+
+    "-Dexamples=disabled" # requires many dependencies and probably not useful for our users
+
+    "-Ddts=disabled" # required `libdca` library not packaged in nixpkgs as of writing, and marked as "BIG FAT WARNING: libdca is still in early development"
+    "-Dfaac=${if faacSupport then "enabled" else "disabled"}"
+    "-Dgsm=disabled" # as of writing, with `gsm` in `buildInputs` we get "GSM plugin is enabled: found libgsm but no headers"; gsm packaging problem?
+    "-Diqa=disabled" # required `dssim` library not packaging in nixpkgs as of writing
+    "-Dmsdk=disabled" # not packaged in nixpkgs as of writing / no Windows support
+    # As of writing, with `libmpcdec` in `buildInputs` we get
+    #   "Could not find libmpcdec header files, but Musepack was enabled via options"
+    # This is likely because nixpkgs has the header in libmpc/mpcdec.h
+    # instead of mpc/mpcdec.h, like Arch does. The situation is not trivial.
+    # There are apparently 2 things called `libmpcdec` from the same author:
+    #   * http://svn.musepack.net/libmpcdec/trunk/src/
+    #   * http://svn.musepack.net/libmpc/trunk/include/mpc/
+    # Fixing it likely requires to first figure out with upstream which one
+    # is needed, and then patching upstream to find it (though it probably
+    # already works on Arch?).
+    "-Dmusepack=disabled"
+    "-Dopenmpt=disabled" # `libopenmpt` not packaged in nixpkgs as of writing
+    "-Dopenni2=disabled" # not packaged in nixpkgs as of writing
+    "-Dopensles=disabled" # not packaged in nixpkgs as of writing
+    "-Drtmp=disabled" # `librtmp` not packaged in nixpkgs as of writing
+    "-Dsctp=disabled" # required `usrsctp` library not packaged in nixpkgs as of writing
+    "-Dteletext=disabled" # required `zvbi` library not packaged in nixpkgs as of writing
+    "-Dtinyalsa=disabled" # not packaged in nixpkgs as of writing
+    "-Dvoaacenc=disabled" # required `vo-aacenc` library not packaged in nixpkgs as of writing
+    "-Dvoamrwbenc=disabled" # required `vo-amrwbenc` library not packaged in nixpkgs as of writing
+    "-Dvulkan=disabled" # Linux-only, and we haven't figured out yet which of the vulkan nixpkgs it needs
+    "-Dwasapi=disabled" # not packaged in nixpkgs as of writing / no Windows support
+    "-Dwpe=disabled" # required `wpe-webkit` library not packaged in nixpkgs as of writing
+
+    # Requires CUDA and we haven't figured out how to make Meson find CUDA yet;
+    # it probably searches via pkgconfig, for which we have no .pc files,
+    # see https://github.com/NixOS/nixpkgs/issues/54395
+    "-Dnvdec=disabled"
+    "-Dnvenc=disabled"
+  ];
+
   enableParallelBuilding = true;
 
   doCheck = false; # fails 20 out of 58 tests, expensive
diff --git a/pkgs/development/libraries/gstreamer/base/default.nix b/pkgs/development/libraries/gstreamer/base/default.nix
index 0acdf71fb72..31396e67e8c 100644
--- a/pkgs/development/libraries/gstreamer/base/default.nix
+++ b/pkgs/development/libraries/gstreamer/base/default.nix
@@ -2,6 +2,11 @@
 , pkgconfig, meson, ninja, gettext, gobject-introspection
 , python3, gstreamer, orc, pango, libtheora
 , libintl, libopus
+, isocodes
+, libjpeg
+, libvisual
+, tremor # provides 'virbisidec'
+, gtk-doc, docbook_xsl, docbook_xml_dtd_412
 , enableX11 ? stdenv.isLinux, libXv
 , enableWayland ? stdenv.isLinux, wayland
 , enableAlsa ? stdenv.isLinux, alsaLib
@@ -10,7 +15,7 @@
 
 stdenv.mkDerivation rec {
   name = "gst-plugins-base-${version}";
-  version = "1.14.4";
+  version = "1.15.1";
 
   meta = with lib; {
     description = "Base plugins and helper libraries";
@@ -22,28 +27,48 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "${meta.homepage}/src/gst-plugins-base/${name}.tar.xz";
-    sha256 = "0qbllw4kphchwhy4p7ivdysigx69i97gyw6q0rvkx1j81r4kjqfa";
+    sha256 = "0qvyx9gs7z2ryhdxxzynn9r1gphfk4xfkhd6dma02sbda9c5jckf";
   };
 
   outputs = [ "out" "dev" ];
 
-  nativeBuildInputs = [ pkgconfig python3 gettext gobject-introspection ]
-
+  nativeBuildInputs = [
+    pkgconfig python3 gettext gobject-introspection
+    gtk-doc
+    # Without these, enabling the 'gtk_doc' gives us `FAILED: meson-install`
+    docbook_xsl docbook_xml_dtd_412
+  ]
   # Broken meson with Darwin. Should hopefully be fixed soon. Tracking
   # in https://bugzilla.gnome.org/show_bug.cgi?id=781148.
   ++ lib.optionals (!stdenv.isDarwin) [ meson ninja ];
 
+  # On Darwin, we currently use autoconf, on all other systems Meson
+  # TODO Switch to Meson on Darwin as well
+
   # TODO How to pass these to Meson?
-  configureFlags = [
+  configureFlags = lib.optionals stdenv.isDarwin [
     "--enable-x11=${if enableX11 then "yes" else "no"}"
     "--enable-wayland=${if enableWayland then "yes" else "no"}"
     "--enable-cocoa=${if enableCocoa then "yes" else "no"}"
   ]
-
   # Introspection fails on my MacBook currently
   ++ lib.optional stdenv.isDarwin "--disable-introspection";
 
-  buildInputs = [ orc libtheora libintl libopus ]
+  mesonFlags = lib.optionals (!stdenv.isDarwin) [
+    # Enables all features, so that we know when new dependencies are necessary.
+    "-Dauto_features=enabled"
+    "-Dexamples=disabled" # requires many dependencies and probably not useful for our users
+    "-Dgl-graphene=disabled" # not packaged in nixpkgs as of writing
+    # See https://github.com/GStreamer/gst-plugins-base/blob/d64a4b7a69c3462851ff4dcfa97cc6f94cd64aef/meson_options.txt#L15 for a list of choices
+    "-Dgl_winsys=[${lib.concatStringsSep "," (lib.optional enableX11 "x11" ++ lib.optional enableWayland "wayland" ++ lib.optional enableCocoa "cocoa")}]"
+  ]
+  ++ lib.optional (!enableX11) "-Dx11=disabled"
+  # TODO How to disable Wayland?
+  ++ lib.optional (!enableAlsa) "-Dalsa=disabled"
+  ++ lib.optional (!enableCdparanoia) "-Dcdparanoia=disabled"
+  ;
+
+  buildInputs = [ orc libtheora libintl libopus isocodes libjpeg libvisual tremor ]
     ++ lib.optional enableAlsa alsaLib
     ++ lib.optionals enableX11 [ libXv pango ]
     ++ lib.optional enableWayland wayland
@@ -61,10 +86,6 @@ stdenv.mkDerivation rec {
   doCheck = false; # fails, wants DRI access for OpenGL
 
   patches = [
-    (fetchpatch {
-        url = "https://bug794856.bugzilla-attachments.gnome.org/attachment.cgi?id=370414";
-        sha256 = "07x43xis0sr0hfchf36ap0cibx0lkfpqyszb3r3w9dzz301fk04z";
-    })
     ./fix_pkgconfig_includedir.patch
   ];
 }
diff --git a/pkgs/development/libraries/gstreamer/core/default.nix b/pkgs/development/libraries/gstreamer/core/default.nix
index b69ab89df24..fc1722e5d6a 100644
--- a/pkgs/development/libraries/gstreamer/core/default.nix
+++ b/pkgs/development/libraries/gstreamer/core/default.nix
@@ -2,12 +2,16 @@
 , pkgconfig, gettext, gobject-introspection
 , bison, flex, python3, glib, makeWrapper
 , libcap,libunwind, darwin
+, elfutils # for libdw
+, bash-completion
+, docbook_xsl, docbook_xml_dtd_412
+, gtk-doc
 , lib
 }:
 
 stdenv.mkDerivation rec {
   name = "gstreamer-${version}";
-  version = "1.14.4";
+  version = "1.15.1";
 
   meta = with lib ;{
     description = "Open source multimedia framework";
@@ -19,14 +23,10 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "${meta.homepage}/src/gstreamer/${name}.tar.xz";
-    sha256 = "1izzhnlsy83rgr4zl3jcl1sryxqbbigrrqw3j4x3nnphqnb6ckzr";
+    sha256 = "05ri9y37qkgvkb2xjywf32c3k9479b0af0m6cjigx04pgwsf42kq";
   };
 
   patches = [
-    (fetchpatch {
-        url = "https://bug794856.bugzilla-attachments.gnome.org/attachment.cgi?id=370411";
-        sha256 = "16plzzmkk906k4892zq68j3c9z8vdma5nxzlviq20jfv04ykhmk2";
-    })
     ./fix_pkgconfig_includedir.patch
   ];
 
@@ -35,13 +35,24 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [
     meson ninja pkgconfig gettext bison flex python3 makeWrapper gobject-introspection
+    bash-completion
+    gtk-doc
+    # Without these, enabling the 'gtk_doc' gives us `FAILED: meson-install`
+    docbook_xsl docbook_xml_dtd_412
   ];
+
   buildInputs =
-       lib.optionals stdenv.isLinux [ libcap libunwind ]
+       lib.optionals stdenv.isLinux [ libcap libunwind elfutils ]
     ++ lib.optional stdenv.isDarwin darwin.apple_sdk.frameworks.CoreServices;
 
   propagatedBuildInputs = [ glib ];
 
+  mesonFlags = [
+    # Enables all features, so that we know when new dependencies are necessary.
+    "-Dauto_features=enabled"
+    "-Dexamples=disabled" # requires many dependencies and probably not useful for our users
+  ];
+
   postInstall = ''
     for prog in "$dev/bin/"*; do
         # We can't use --suffix here due to quoting so we craft the export command by hand
diff --git a/pkgs/development/libraries/gstreamer/default.nix b/pkgs/development/libraries/gstreamer/default.nix
index 9aec8763404..767ef8c6afd 100644
--- a/pkgs/development/libraries/gstreamer/default.nix
+++ b/pkgs/development/libraries/gstreamer/default.nix
@@ -13,7 +13,7 @@ rec {
 
   gst-plugins-ugly = callPackage ./ugly { inherit gst-plugins-base; };
 
-  gst-rtsp-server = callPackage ./rtsp-server { inherit gst-plugins-base; };
+  gst-rtsp-server = callPackage ./rtsp-server { inherit gst-plugins-base gst-plugins-bad; };
 
   gst-libav = callPackage ./libav { inherit gst-plugins-base; };
 
diff --git a/pkgs/development/libraries/gstreamer/good/default.nix b/pkgs/development/libraries/gstreamer/good/default.nix
index 247a74e3a32..5234836413c 100644
--- a/pkgs/development/libraries/gstreamer/good/default.nix
+++ b/pkgs/development/libraries/gstreamer/good/default.nix
@@ -10,6 +10,10 @@
 , libXext
 , libXfixes
 , ncurses
+, xorg
+, libgudev
+, wavpack
+, jack2
 }:
 
 assert gtkSupport -> gtk3 != null;
@@ -19,7 +23,7 @@ let
 in
 stdenv.mkDerivation rec {
   name = "gst-plugins-good-${version}";
-  version = "1.14.4";
+  version = "1.15.1";
 
   meta = with stdenv.lib; {
     description = "Gstreamer Good Plugins";
@@ -36,7 +40,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "${meta.homepage}/src/gst-plugins-good/${name}.tar.xz";
-    sha256 = "0y89qynb4b6fry3h43z1r99qslmi3m8xhlq0i5baq2nbc0r5b2sz";
+    sha256 = "15f6klr7wg6jlcyx0qspi13s8wmc9fij1bx1bbvy90a9a72v97rb";
   };
 
   outputs = [ "out" "dev" ];
@@ -58,10 +62,27 @@ stdenv.mkDerivation rec {
     libXext # present feature but undeclared in meson_options.txt, see https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/issues/553
     libXfixes # present feature but undeclared in meson_options.txt, see https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/issues/553
     ncurses
+    xorg.libXfixes # present feature but undeclared in meson_options.txt, see https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/issues/553
+    xorg.libXdamage # present feature but undeclared in meson_options.txt, see https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/issues/553
+    wavpack
   ]
   ++ optional gtkSupport gtk3 # for gtksink
   ++ optionals stdenv.isDarwin [ darwin.apple_sdk.frameworks.Cocoa ]
-  ++ optionals stdenv.isLinux [ libv4l libpulseaudio libavc1394 libiec61883 ];
+  ++ optionals stdenv.isLinux [ libv4l libpulseaudio libavc1394 libiec61883 libgudev jack2 ];
+
+  mesonFlags = [
+    # Enables all features, so that we know when new dependencies are necessary.
+    "-Dauto_features=enabled"
+    "-Dexamples=disabled" # requires many dependencies and probably not useful for our users
+    "-Dqt5=disabled" # not clear as of writing how to correctly pass in the required qt5 deps
+  ]
+  ++ optional (!gtkSupport) "-Dgtk3=disabled"
+  ++ optionals (!stdenv.isLinux) [
+    "-Djack=disabled" # unclear whether Jack works on Darwin
+  ]
+  ++ optionals (!stdenv.isLinux) [
+    "-Dv4l2-gudev=disabled"
+  ];
 
   # fails 1 tests with "Unexpected critical/warning: g_object_set_is_valid_property: object class 'GstRtpStorage' has no property named ''"
   doCheck = false;
diff --git a/pkgs/development/libraries/gstreamer/libav/default.nix b/pkgs/development/libraries/gstreamer/libav/default.nix
index 7f7393bba28..5a3b6020aef 100644
--- a/pkgs/development/libraries/gstreamer/libav/default.nix
+++ b/pkgs/development/libraries/gstreamer/libav/default.nix
@@ -10,7 +10,7 @@ assert withSystemLibav -> libav != null;
 
 stdenv.mkDerivation rec {
   name = "gst-libav-${version}";
-  version = "1.14.4";
+  version = "1.15.1";
 
   meta = {
     homepage = https://gstreamer.freedesktop.org;
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "${meta.homepage}/src/gst-libav/${name}.tar.xz";
-    sha256 = "1nk5g24z2xx5kaw5cg8dv8skdc516inahmkymcz8bxqxj28qbmyz";
+    sha256 = "0hq5y8zg6a3fliwip7k85hg6s6amsmbqgrjl6axzrr3y6akcvslk";
   };
 
   outputs = [ "out" "dev" ];
@@ -34,4 +34,10 @@ stdenv.mkDerivation rec {
     [ gst-plugins-base orc bzip2 ]
     ++ optional withSystemLibav libav
     ;
+
+  mesonFlags = [
+    # Enables all features, so that we know when new dependencies are necessary.
+    "-Dauto_features=enabled"
+  ];
+
 }
diff --git a/pkgs/development/libraries/gstreamer/rtsp-server/default.nix b/pkgs/development/libraries/gstreamer/rtsp-server/default.nix
index 6236edec6a4..5dc678cf0ab 100644
--- a/pkgs/development/libraries/gstreamer/rtsp-server/default.nix
+++ b/pkgs/development/libraries/gstreamer/rtsp-server/default.nix
@@ -1,10 +1,12 @@
 { stdenv, fetchurl, meson, ninja, pkgconfig
-, gst-plugins-base, gettext, gobject-introspection
+, gettext, gobject-introspection
+, gst-plugins-base
+, gst-plugins-bad
 }:
 
 stdenv.mkDerivation rec {
   name = "gst-rtsp-server-${version}";
-  version = "1.14.4";
+  version = "1.15.1";
 
   meta = with stdenv.lib; {
     description = "Gstreamer RTSP server";
@@ -19,12 +21,18 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "${meta.homepage}/src/gst-rtsp-server/${name}.tar.xz";
-    sha256 = "1wc4d0y57hpfvv9sykjg8mxj86dw60mf696fbqbiqq6dzlmcw3ix";
+    sha256 = "0d0jaf7ir40dxpxs41wyb7m7riyl7wsqcb5qvd4vhwpz0dwxhpvl";
   };
 
   outputs = [ "out" "dev" ];
 
   nativeBuildInputs = [ meson ninja gettext gobject-introspection pkgconfig ];
 
-  buildInputs = [ gst-plugins-base ];
+  buildInputs = [ gst-plugins-base gst-plugins-bad ];
+
+  mesonFlags = [
+    # Enables all features, so that we know when new dependencies are necessary.
+    "-Dauto_features=enabled"
+    "-Dexamples=disabled" # requires many dependencies and probably not useful for our users
+  ];
 }
diff --git a/pkgs/development/libraries/gstreamer/ugly/default.nix b/pkgs/development/libraries/gstreamer/ugly/default.nix
index 0cdfd1f4a7b..19d84cbd349 100644
--- a/pkgs/development/libraries/gstreamer/ugly/default.nix
+++ b/pkgs/development/libraries/gstreamer/ugly/default.nix
@@ -2,12 +2,13 @@
 , gst-plugins-base, orc, gettext
 , a52dec, libcdio, libdvdread
 , libmad, libmpeg2, x264, libintl, lib
+, opencore-amr
 , darwin
 }:
 
 stdenv.mkDerivation rec {
   name = "gst-plugins-ugly-${version}";
-  version = "1.14.4";
+  version = "1.15.1";
 
   meta = with lib; {
     description = "Gstreamer Ugly Plugins";
@@ -25,7 +26,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "${meta.homepage}/src/gst-plugins-ugly/${name}.tar.xz";
-    sha256 = "08vd1xgwmapnviah47zv5h2r02qdd20y4f07rvv5zhv6y4vxh0mc";
+    sha256 = "17p9x30ywanz1lbk061kzd8bypcv5hkin6iyaqffp8alrwiak3qp";
   };
 
   outputs = [ "out" "dev" ];
@@ -37,8 +38,16 @@ stdenv.mkDerivation rec {
     a52dec libcdio libdvdread
     libmad libmpeg2 x264
     libintl
+    opencore-amr
   ] ++ lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks;
     [ IOKit CoreFoundation DiskArbitration ]);
 
+  mesonFlags = [
+    # Enables all features, so that we know when new dependencies are necessary.
+    "-Dauto_features=enabled"
+    "-Dexamples=disabled" # requires many dependencies and probably not useful for our users
+    "-Dsidplay=disabled" # sidplay / sidplay/player.h isn't packaged in nixpkgs as of writing
+  ];
+
   NIX_LDFLAGS = [ "-lm" ];
 }
diff --git a/pkgs/development/libraries/gstreamer/vaapi/default.nix b/pkgs/development/libraries/gstreamer/vaapi/default.nix
index e84f8dce912..ae5a6b1c97c 100644
--- a/pkgs/development/libraries/gstreamer/vaapi/default.nix
+++ b/pkgs/development/libraries/gstreamer/vaapi/default.nix
@@ -5,11 +5,11 @@
 
 stdenv.mkDerivation rec {
   name = "gst-vaapi-${version}";
-  version = "1.14.4";
+  version = "1.15.1";
 
   src = fetchurl {
     url = "${meta.homepage}/src/gstreamer-vaapi/gstreamer-vaapi-${version}.tar.xz";
-    sha256 = "18yha6119v7mwz47idv2vykzfssqfmh6hc824wqqsshwjvzdn66f";
+    sha256 = "1aazan6r6p5aabb671znjkh8kmpxkz68wvaickqwzb1bz0ijcivc";
   };
 
   outputs = [ "out" "dev" ];
@@ -27,6 +27,12 @@ stdenv.mkDerivation rec {
     mkdir -p $GST_PLUGIN_PATH_1_0
   '';
 
+  mesonFlags = [
+    # Enables all features, so that we know when new dependencies are necessary.
+    "-Dauto_features=enabled"
+    "-Dexamples=disabled" # requires many dependencies and probably not useful for our users
+  ];
+
   meta = {
     homepage = https://gstreamer.freedesktop.org;
     license = stdenv.lib.licenses.lgpl21Plus;
diff --git a/pkgs/development/libraries/gstreamer/validate/default.nix b/pkgs/development/libraries/gstreamer/validate/default.nix
index 916185bf7ec..869001e7920 100644
--- a/pkgs/development/libraries/gstreamer/validate/default.nix
+++ b/pkgs/development/libraries/gstreamer/validate/default.nix
@@ -4,7 +4,7 @@
 
 stdenv.mkDerivation rec {
   name = "gst-validate-${version}";
-  version = "1.14.4";
+  version = "1.15.1";
 
   meta = {
     description = "Integration testing infrastructure for the GStreamer framework";
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "${meta.homepage}/src/gst-validate/${name}.tar.xz";
-    sha256 = "1ismv4i7ldi04swq76pcpd5apxqd52yify5hvlyan2yw9flwrp0q";
+    sha256 = "195hwblagfsnq1xn858al3f32jn5nynr4j5x395dpg3vl3c4k5v4";
   };
 
   outputs = [ "out" "dev" ];
@@ -31,4 +31,9 @@ stdenv.mkDerivation rec {
   propagatedBuildInputs = [ gstreamer gst-plugins-base ];
 
   enableParallelBuilding = true;
+
+  mesonFlags = [
+    # Enables all features, so that we know when new dependencies are necessary.
+    "-Dauto_features=enabled"
+  ];
 }
diff --git a/pkgs/development/libraries/libnice/default.nix b/pkgs/development/libraries/libnice/default.nix
index d6bb8ec5046..f4ce1f6eea0 100644
--- a/pkgs/development/libraries/libnice/default.nix
+++ b/pkgs/development/libraries/libnice/default.nix
@@ -20,18 +20,20 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  nativeBuildInputs = [ meson ninja pkgconfig python3 gobject-introspection gtk-doc docbook_xsl docbook_xml_dtd_412 ];
+  nativeBuildInputs = [
+    meson ninja pkgconfig python3 gobject-introspection
+    gtk-doc
+    # Without these, enabling the 'gtk_doc' gives us `FAILED: meson-install`
+    docbook_xsl docbook_xml_dtd_412
+  ];
   buildInputs = [ gst_all_1.gstreamer gst_all_1.gst-plugins-base gnutls ];
   propagatedBuildInputs = [ glib gupnp-igd ];
 
   mesonFlags = [
-    "-Dgupnp=enabled"
-    "-Dgstreamer=enabled"
-    "-Dignored-network-interface-prefix=enabled"
-    "-Dexamples=enabled"
-    "-Dtests=enabled"
-    "-Dgtk_doc=enabled"
-    "-Dintrospection=enabled"
+    # Enables all features, so that we know when new dependencies are necessary.
+    "-Dauto_features=enabled"
+    "-Dgtk_doc=enabled" # Disabled by default as of libnice-0.1.15
+    "-Dexamples=disabled" # requires many dependencies and probably not useful for our users
   ];
 
   # TODO; see #53293 etc.
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 8ad6194978b..f90aa516e56 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -10670,7 +10670,7 @@ in
   gsettings-qt = libsForQt5.callPackage ../development/libraries/gsettings-qt { };
 
   gst_all_1 = recurseIntoAttrs(callPackage ../development/libraries/gstreamer {
-    callPackage = newScope { libav = pkgs.ffmpeg; };
+    callPackage = newScope { libav = pkgs.ffmpeg_4; };
   });
 
   gstreamer = callPackage ../development/libraries/gstreamer/legacy/gstreamer { };