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Document libav feature

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README.md
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@ -7,7 +7,39 @@ bliss analysis. This is then intended to be used by [Bliss Mixer](https://github
# Building
clang, pkg-config, and ffmpeg are required to build, as well as
This application can be built in 2 variants:
1. Using command-line `ffmpeg` to decode files
2. Using `libavcodec`, etc, to decode files
Using `libavcodec` is about 70% faster, but might have issues with library, versioning, etc.
Using `ffmpeg` whilst slower produces a more portable application.
## Build for 'ffmpeg' command-line usage
`clang` and `pkg-config` are required to build, as well as
[Rust](https://www.rust-lang.org/tools/install)
To install dependencies on a Debian system:
```
apt install -y clang pkg-config
```
To install dependencies on a Fedora system:
```
dnf install clang pkg-config
```
Build with `cargo build --release`
`ffmpeg` is then a run-time dependency, and should be installed on any system where this application
is to be run - it should also be in the users `$PATH`
## Build for 'libavcodec' library usage
`clang`, `pkg-config`, and `ffmpeg` are required to build, as well as
[Rust](https://www.rust-lang.org/tools/install)
To install dependencies on a Debian system:
@ -21,8 +53,10 @@ To install dependencies on a Fedora system:
dnf install ffmpeg-devel clang pkg-config
```
Build with `cargo build --release`
Build with `cargo build --release --features=libav`
The resultant application will be less portable, due to dependencies on `libavcodec` libraries (and
their dependencies).
# Usage