add libraries to README

README.md

@@ -7,6 +7,7 @@ Contents:
 - [Installation and usage](#installation-and-usage)
 - [Updating](#updating)
 - [FAQ](#faq)
+- [Included libraries](#included-libraries)
 - [Issues](#issues)
 - [Maintainers](#maintainers)
 
@@ -69,6 +70,58 @@ Or, if you are using the `HEAD` version and want to update to the latest commit:
 brew update && brew upgrade varenc/ffmpeg/ffmpeg --fetch-HEAD
 ```
 
+## Included libraries
+
+This formula features the following libraries:
+
+| Dependency | Included by default? | Description |
+| ---------- | -------------------- | ----------- |
+| `libaom` | ✔ | AV1 encoder |
+| `fontconfig` | ✔ | Font access library |
+| `freetype` | ✔ | Freetype font engine |
+| `frei0r` | ✔ | frei0r filters |
+| `lame` | ✔ | LAME MP3 encoder |
+| `libass` | ✔ | ASS subtitle support |
+| `libvorbis` | ✔ | Vorbis encoder |
+| `libvpx` | ✔ | VP8 and VP9 encoder |
+| `opus` | ✔ | Opus encoder |
+| `rtmpdump` | ✔ | RTMP dumping support |
+| `sdl2` | ✔ | Simple DirectMedia Layer |
+| `snappy` | ✔ | Snappy compression support |
+| `theora` | ✔ | Theora encoder |
+| `x264` | ✔ | x264 H.264 encoder |
+| `x265` | ✔ | x265 HEVC encoder |
+| `xz` | ✔ | XZ compression support |
+| `chromaprint` | | Chromaprint audio fingerprinting library |
+| `fdk-aac` | | Fraunhofer FDK AAC library |
+| `game-music-emu` | | game-music-emu support |
+| `libbluray` | | libbluray support |
+| `libbs2b` | | libbs2b support |
+| `libcaca` | | libcaca support |
+| `libgsm` | | libgsm support |
+| `libmodplug` | | libmodplug support |
+| `librsvg` | | SVG files as inputs via librsvg |
+| `libsoxr` | | soxr resample library |
+| `libssh` | | SFTP protocol via libssh |
+| `libvidstab` | | vid.stab support for video stabilization |
+| `libvmaf` | | VMAF video quality metric |
+| `libxml2` | | libxml2 library |
+| `opencore-amr` | | Opencore AMR NR/WB audio format |
+| `openh264` | | OpenH264 library |
+| `openjpeg` | | JPEG 2000 image format |
+| `openssl` | | SSL support |
+| `rtmpdump` | | rtmpdump support |
+| `rubberband` | | rubberband library |
+| `speex` | | speex support |
+| `srt` | | SRT library |
+| `tesseract` | | tesseract OCR engine |
+| `two-lame` | | two-lame support |
+| `wavpack` | | wavpack support |
+| `webp` | | libwebp to encode WEBP images |
+| `xvid` | | xvid support |
+| `zeromq` | | libzeromq to receive commands sent through a libzeromq client |
+| `zimg` | | z.lib zimg library |
+
 ## Issues
 
 To report issues, please [file an issue on GitHub](https://github.com/varenc/homebrew-ffmpeg/issues). Please note that we will only be able to help with issues that are exclusive to this tap.