diff --git a/source/docs/en/latest/developer/build-windows.markdown b/source/docs/en/latest/developer/build-windows.markdown
index 496ad847..a2959be9 100644
--- a/source/docs/en/latest/developer/build-windows.markdown
+++ b/source/docs/en/latest/developer/build-windows.markdown
@@ -18,48 +18,12 @@ Building HandBrake for Windows
 
 ## Command line interface and LibHB
 
-Building the HandBrake [CLI](abbr:Command Line Interface) and LibHB (`hb.dll`) for Windows requires Linux and a recent [MinGW-w64](https://mingw-w64.org/) toolchain. Fedora 28 or later, or Ubuntu 18.04 LTS (Bionic Beaver) or later are recommended; other distros may work as well. In all cases, we recommend you build the MinGW-w64 toolchain using our instructions and the included script, as some packaged versions have issues that can produce non-functioning builds.
-
-### Installing dependencies on Fedora
-
-The following instructions are for [Fedora](https://getfedora.org) 30 through 32.
-
-Basic requirements to run commands:
-
-- sudo (for normal user accounts)
-
-Dependencies:
-
-- Development Tools
-- C Development Tools and Libraries
-- cmake
-- gcc-c++
-- git
-- libtool
-- m4
-- make
-- meson
-- nasm
-- ninja-build
-- patch
-- python
-- tar
-- zlib-devel
-
-Install dependencies.
-
-    sudo dnf update
-    sudo dnf groupinstall "Development Tools" "C Development Tools and Libraries"
-    sudo dnf install cmake gcc-c++ git libtool m4 make meson nasm ninja-build patch python tar zlib-devel
-
-Install the additional dependencies required to build the MinGW-w64 toolchain.
-
-    sudo dnf install bison bzip2 curl flex g++ gzip pax
-
+Building the HandBrake [CLI](abbr:Command Line Interface) and LibHB (`hb.dll`) for Windows requires Linux and a recent [MinGW-w64](https://mingw-w64.org/) toolchain. Ubuntu 20.04 LTS or later are recommended; other distros may work as well. In all cases, we recommend you build the MinGW-w64 toolchain using our instructions and the included script, as some packaged versions have issues that can produce non-functioning builds.
 
 ### Installing dependencies on Ubuntu
 
 The following instructions are for [Ubuntu](https://www.ubuntu.com) 20.04 (Focal Fossa).
+These should also work with Windows Subsystem for Linux.
 
 Basic requirements to run commands:
 
@@ -139,9 +103,7 @@ The following tools are required to build and run the [GUI](abbr:Graphical User
   - [Source Tree](https://www.sourcetreeapp.com) (recommended)
   - Client included with Visual Studio 2015 or later
 - `hb.dll` (see the LibHB build instructions preceding these, or download from [https://handbrake.fr/nightly.php](https://handbrake.fr/nightly.php))
-- [JetBrains ReSharper](https://www.jetbrains.com/?from=HandBrake) (optional)
-  - Recommended for developers interested in working on the Windows UI
-  - Active, regular contributors may request a free for open source ReSharper license from the HandBrake Team, courtesy of JetBrains
+
 
 Clone `https://github.com/HandBrake/HandBrake.git` using your git client.
 
diff --git a/source/docs/en/latest/table-of-contents.markdown b/source/docs/en/latest/table-of-contents.markdown
index 8437e487..4f2a66cb 100644
--- a/source/docs/en/latest/table-of-contents.markdown
+++ b/source/docs/en/latest/table-of-contents.markdown
@@ -135,13 +135,14 @@ Table of contents
   - [Profiles and levels](technical/video-profiles-levels.html)<span class="notice draft"><span>draft</span></span>
   - [Video angles](technical/video-angles.html)<span class="notice draft"><span>draft</span></span>
   - [Anamorphic video](technical/anamorphic-guide.html)<span class="notice draft"><span>draft</span></span>
-  - [Modulus](technical/modulus.html)<span class="notice draft"><span>draft</span></span>
+  <!-- - [Modulus](technical/modulus.html)<span class="notice draft"><span>draft</span></span>-->
   - [Frame rate](technical/frame-rates.html)<span class="notice draft"><span>draft</span></span>
 - Hardware encoders
   - [AMD VCE](technical/video-vce.html)
   - [Apple VideoToolbox](technical/video-videotoolbox.html)
   - [Intel Quick Sync Video](technical/video-qsv.html)
   - [NVIDIA NVENC](technical/video-nvenc.html)
+  - [Media Foundation (ARM)](technical/video-mediafoundation.html)
 - Audio
   - [Dynamic range compression](technical/dynamic-range-compression.html)<span class="notice draft"><span>draft</span></span>
   - [Audio quality](technical/audio-quality.html)<span class="notice draft"><span>draft</span></span>
@@ -149,10 +150,11 @@ Table of contents
   - [Container formats](technical/containers.html)<span class="notice draft"><span>draft</span></span>
   - [iPod 5th Generation support](technical/old-ipod-support.html)<span class="notice draft"><span>draft</span></span>
   - [Automatic file naming](technical/automatic-file-naming.html)<span class="notice draft"><span>draft</span></span>
+<!--  
 - Filters
   - [Filters summary](technical/filters-summary.html)<span class="notice draft"><span>draft</span></span>
 
-<!--
+
 - [Web optimized](technical/web-optimised.html)
 - [Video source type](advanced/video-sources.html)
 - Advanced Filter Settings
diff --git a/source/docs/en/latest/technical/audio-codecs.markdown b/source/docs/en/latest/technical/audio-codecs.markdown
index b396feac..930b6712 100644
--- a/source/docs/en/latest/technical/audio-codecs.markdown
+++ b/source/docs/en/latest/technical/audio-codecs.markdown
@@ -64,12 +64,16 @@ Audio Encoders
     -   HandBrake offers Vorbis audio encoding as well, for which it uses the
         aoTuV branch that offers quality tweaks.
 
--   AC3:
+-   AC3 and E-AC3:
 
     -   HandBrake can encode to AC3 using FFmpeg.
 
     -   This is not the same as Passthru. You can encode any audio track to AC3.
 
+-   Opus (FFmpeg)
+    
+    -   Available in MKV files.
+
 -   Flac 16 and 24bit (FFmpeg)
 
     -   Loss-less audio compression.
@@ -85,7 +89,7 @@ Passthru options.
 -----------------
 
 HandBrake supports passthru for a limited number of popular source formats.
-These are: AC3, DTS, DTS-HD, TrueHD, MP3 or AAC (Passthru)
+These are: AC3, E-AC3, DTS, DTS-HD, TrueHD, MP3, MP2, AAC or flac (Passthru)
 
 This copies the audio bit-for-bit from the source so offers no loss in audio
 quality. These audio tracks can be quite large so can impact the final size of
diff --git a/source/docs/en/latest/technical/system-requirements.markdown b/source/docs/en/latest/technical/system-requirements.markdown
index 024a88c6..53007822 100644
--- a/source/docs/en/latest/technical/system-requirements.markdown
+++ b/source/docs/en/latest/technical/system-requirements.markdown
@@ -21,14 +21,14 @@ System requirements
 The following is the minimum level of hardware that HandBrake supports.
 
 - Processor:
-  - Intel Core i3 or better
-  - AMD FX / 2014+ APU or better
-- Free memory:
-  - 512 MB for transcoding standard definition video (480p/576p)
-  - 1.5 GB for transcoding high definition video (720p/1080p)
-  - 4 GB or more for transcoding ultra high definition video (2160p 4K)
+  - Intel Core (4th generation and newer) i3, i5, i7, i9 or equivalent Xeon
+  - AMD Ryzen, Threadripper or Epyc
+- Free memory:  
+  - 1 GB for transcoding standard definition video (480p/576p)
+  - 2 GB for transcoding high definition video (720p/1080p)
+  - 6 GB or more for transcoding ultra high definition video (2160p 4K)
 - System storage:
-  - 100 MB for the HandBrake app
+  - 150 MB for the HandBrake app
   - 2 GB or more recommended for processing and storing your new videos
 - Display resolution:
   - 1024x768 minimum, proportionately higher with display scaling
@@ -88,7 +88,7 @@ Interim (non-LTS) versions are typically supported until their end of life.
 | Ubuntu Version          | Status              | Last Compatible Version | Notes                              |
 |-------------------------|---------------------|-------------------------|------------------------------------|
 | 20.04 LTS Focal Fossa   | Supported           |                         | Flatpak, PPA, and source.          |
-| 18.04 LTS Bionic Beaver | Deprecated in 1.3.0 |                         | Flatpak only.                      |
+| 18.04 LTS Bionic Beaver | Deprecated in 1.3.0 | HandBrake 1.3.0         | Flatpak only.                      |
 | 16.04 LTS Xenial Xerus  | Unsupported         | HandBrake 1.1.2         | Various issues affect operability. |
 | 14.04 LTS Trusty Tahr   | Unsupported         | HandBrake 1.1.2         | End of life (standard support).    |
 
@@ -107,16 +107,17 @@ HandBrake is supported on recent versions of macOS[^apple-eol].
 
 | macOS Version      | Status              | Last Compatible Version | Notes                              |
 |--------------------|---------------------|-------------------------|------------------------------------|
+| 11 Big Sur         | Supported           |                         | Requires HandBrake 1.4 or later.   |
 | 10.15 Catalina     | Supported           |                         | Requires HandBrake 1.2.2 or later. |
 | 10.14 Mojave       | Supported           |                         | Requires HandBrake 1.1.2 or later. |
-| 10.13 High Sierra  | Deprecated in 1.3.0 |                         | End of life expected Q4 2020.      |
-| 10.12 Sierra       | Deprecated in 1.3.0 |                         | End of life.                       |
-| 10.11 El Capitan   | Deprecated in 1.2.0 |                         | End of life.                       |
-| 10.10 Yosemite     | Unsupported         | HandBrake 1.1.2         | End of life.                       |
-| 10.9 Mavericks     | Unsupported         | HandBrake 1.1.2         | End of life.                       |
-| 10.8 Mountain Lion | Unsupported         | HandBrake 1.1.2         | End of life.                       |
-| 10.7 Lion          | Unsupported         | HandBrake 1.1.2         | End of life.                       |
-| 10.6 Snow Leopard  | Unsupported         | HandBrake 0.10.5        | End of life.                       |
+| 10.13 High Sierra  | Unsupported         | 1.3.3                   | End of life                        |
+| 10.12 Sierra       | Unsupported         | 1.3.3                   | End of life.                       |
+| 10.11 El Capitan   | Unsupported         | 1.2.0                   | End of life.                       |
+| 10.10 Yosemite     | Unsupported         | 1.1.2                   | End of life.                       |
+| 10.9 Mavericks     | Unsupported         | 1.1.2                   | End of life.                       |
+| 10.8 Mountain Lion | Unsupported         | 1.1.2                   | End of life.                       |
+| 10.7 Lion          | Unsupported         | 1.1.2                   | End of life.                       |
+| 10.6 Snow Leopard  | Unsupported         | 0.10.5                  | End of life.                       |
 
 [VLC](https://www.videolan.org/vlc/) is recommended for viewing media files, notably Matroska (MKV), which is not natively supported on macOS.
 
@@ -125,15 +126,15 @@ HandBrake is supported on recent versions of macOS[^apple-eol].
 
 ### Windows
 
-HandBrake is supported on recent Windows versions and requires [Microsoft .NET Framework](https://dotnet.microsoft.com/download/dotnet-framework) 4.8 or later.
+HandBrake requires the [.NET Desktop Runtime](https://dotnet.microsoft.com/download/dotnet/5.0) 5.0.x
 
 | Windows Version | Status              | Last Compatible Version | Notes        |
 |-----------------|---------------------|-------------------------|--------------|
 | Windows 10      | Supported           |                         |              |
-| Windows 8.1     | Supported           |                         |              |
-| Windows 7 SP1   | Deprecated in 1.1.0 |                         | End of life. |
-| Windows Vista   | Unsupported         | HandBrake 1.0.7         | End of life. |
-| Windows XP      | Unsupported         | HandBrake 0.9.9         | End of life. |
+| Windows 8.1     | Unsupported         | 1.3.3                   | End of life. |
+| Windows 7 SP1   | Unsupported         | 1.3.3                   | End of life. |
+| Windows Vista   | Unsupported         | 1.0.7                   | End of life. |
+| Windows XP      | Unsupported         | 0.9.9                   | End of life. |
 
 [VLC](https://www.videolan.org/vlc/) is recommended for viewing media files.
 
diff --git a/source/docs/en/latest/technical/video-codecs.markdown b/source/docs/en/latest/technical/video-codecs.markdown
index 236a8979..8b509dfd 100644
--- a/source/docs/en/latest/technical/video-codecs.markdown
+++ b/source/docs/en/latest/technical/video-codecs.markdown
@@ -18,26 +18,25 @@ Video codecs
 
 The following video codecs are available for encoding in HandBrake.
 
-- H.264 (x264):
+- H.264:
 
     - MPEG-4 Part 10, also known as H.264/AVC
     - Provides excellent quality, performance, and file size
     - Widely supported by media players, including mobile devices
+    - Several different encoders are supported: 
+      - In software: x264  
+      - In hardware: Intel QuickSync, AMD VCE, Nvidia NVENC and ARM devices though MediaFoundation.
 
-- H.264 (Intel QSV):
-
-    - MPEG-4 Part 10, also known as H.264/AVC
-    - Hardware based encoder available on Intel processors with Intel HD Graphics (Haswell or newer series CPUs recommended for best quality and file size)
-    - Very fast with significantly lower CPU usage than software H.264 encoders such as x264
-    - Produces larger (but usually not significantly larger) file sizes and slightly lower quality to an equivalent x264 encode, a trade-off that is typically acceptable, especially on lower performance systems
-
-- H.265 (x265)
+- H.265 (HEVC)
 
     - MPEG-H Part 2, also known as H.265/HEVC
     - Successor to H.264/AVC offering higher quality encodes and smaller file sizes
-    - Current strengths of x265 are improved quality and compression for low bit rate encodes, and for ultra high definition content
+    - Current strengths are improved quality and compression for low bit rate encodes, and for ultra high definition content
     - Significantly slower than software H.264/AVC encoders
     - Limited device compatibility compared to H.264/AVC, but this is improving rapidly
+    - Several different encoders are supported: 
+      - In software: x265  
+      - In hardware: Intel QuickSync, AMD VCE, Nvidia NVENC and ARM devices though MediaFoundation.
 
 - MPEG-4 (ffmpeg):
 
diff --git a/source/docs/en/latest/technical/video-mediafoundation.markdown b/source/docs/en/latest/technical/video-mediafoundation.markdown
new file mode 100644
index 00000000..d00adec0
--- /dev/null
+++ b/source/docs/en/latest/technical/video-mediafoundation.markdown
@@ -0,0 +1,39 @@
+---
+Type:            article
+Title:           Media Foundation Encoder
+Project:         HandBrake
+Project_URL:     https://handbrake.fr/
+Project_Version: Latest
+Language:        English
+Language_Code:   en
+Authors:         [ Scott (s55) ]
+Copyright:       2021 HandBrake Team
+License:         Creative Commons Attribution-ShareAlike 4.0 International
+License_Abbr:    CC BY-SA 4.0
+License_URL:     https://handbrake.fr/docs/license.html
+---
+
+Apple VideoToolbox
+==================
+
+## Supported hardware
+
+- Windows 10 for ARM with Qualcomm ARM processors. This encoder will not display on x86 based systems.
+
+## Enabling support
+
+If your computer is supported you will see one or more of the following video encoders added to the encoder control on the `Video` tab.
+
+- H.264 (MediaFoundation)
+- H.265 (MediaFoundation)
+
+
+## Performance
+
+Only video encoding is performed by the hardware encoder. Every stage prior to and after video encoding including decoding, filters, audio/video sync, audio encoding, muxing, etc., is performed by the CPU. As a result, it is normal to have high (even 100%) CPU utilisation during encodes.
+
+It is common, particularly on lower-end hardware, for the CPU to be a bottleneck for the hardware video encoder. To minimize this effect, disable any filters that you do not require.
+
+## Advanced options
+
+There are no advanced options available for VideoToolbox encoders.
diff --git a/source/docs/en/latest/technical/video-vce.markdown b/source/docs/en/latest/technical/video-vce.markdown
index d052f786..8445c34e 100644
--- a/source/docs/en/latest/technical/video-vce.markdown
+++ b/source/docs/en/latest/technical/video-vce.markdown
@@ -18,7 +18,7 @@ AMD VCE
 
 ## Supported Hardware and Configurations
 
-- AMD Radeon RX 400, 500, Vega/II, Navi series GPU or better
+- AMD Radeon RX400, RX500, Vega, RX5000 and RX6000 series GPU or better
 - Ubuntu Linux 20.04 or later
 - Windows 10