# ffmpeg-builder A collection of scripts for building `ffmpeg` and encoding content with the built `ffmpeg`. Tested on: - linux x86_64/aarch64 on: - ubuntu - fedora - debian - archlinux - darwin aarch64 With these scripts you can: 1. install required dependencies using `./scripts/install_deps.sh` 2. build ffmpeg with the desired configuration using `./scripts/build.sh` 3. encode a file using libsvtav1_psy and libopus using `./scripts/encode.sh` 4. estimate the film grain of a given file using `./scripts/efg.sh` # Building This project supports multiple ways to build. ## Configuration Configuration is done through environment variables. By default, this project will build a static `ffmpeg` binary in `./gitignore/sysroot/bin/ffmpeg`. The default enabled libraries included in the `ffmpeg` build are: - libsvtav1_psy - libopus - libdav1d - libaom - librav1e - libvmaf - libx264 - libx265 - libwebp - libmp3lame The user-overridable compile options are: - `CLEAN`: clean build directories before building - `LTO`: enable link time optimization - `OPT`: optimization level (0-3) - `STATIC`: static or shared build - `ARCH`: architecture type (x86-64-v{1,2,3,4}, armv8-a, etc) - `PREFIX`: prefix to install to, default is local install in ./gitignore/sysroot - `ENABLE`: configure what ffmpeg enables Examples: - only build libsvtav1_psy and libopus: `ENABLE='libsvtav1_psy libopus' ./scripts/build.sh` - build shared libraries in custom path: `PREFIX=/usr/local STATIC=OFF ./scripts/build.sh` - build without LTO at O1: `LTO=OFF OPT=1 ./scripts/build.sh` ### Native build Make sure to install required dependencies using `./scripts/install_deps.sh`. Then build ffmpeg with the desired configuration using `./scripts/build.sh`. ### Docker build 1. choose a given distro from: ubuntu fedora debian archlinux. 2. build a docker image with the required dependencies pre-installed using `./scripts/docker_build_image.sh` ``. 3. run a docker image with the given arguments using `./scripts/docker_run_image.sh` `` `./scripts/build.sh` Docker builds support the same configuration options as native builds. For example: `ENABLE='libdav1d' ./scripts/docker_run_image.sh ubuntu ./scripts/build.sh` to build `ffmpeg` on ubuntu with only `libdav1d` enabled. # Encoding scripts The encoding scripts are designed to be installed to system paths for re-use via symbolic links back to this repo. ## Encoding with svtav1-psy and opus ```bash encode -i input [options] output [-P NUM] set preset (default: 3) [-C NUM] set CRF (default: 25) [-g NUM] set film grain for encode [-p] print the command instead of executing it (default: false) [-c] use cropdetect (default: false) [-d] enable dolby vision (default: false) [-v] print relevant version info [-s] use same container as input, default is convert to mkv [output] if unset, defaults to ${HOME}/av1-input-file-name.mkv [-u] update script (git pull ffmpeg-builder) [-I] system install at /usr/local/bin/encode [-U] uninstall from /usr/local/bin/encode ``` - Uses svtav1-psy for the video encoder - Uses libopus for the audio encoder - Skips re-encoding av1/opus content - Only maps audio streams that match the video stream language if the video stream has a defined language. - Only maps english subtitle streams. - Adds track statistics to the output mkv file and embeds the encoder versions to the output metadata. For example: ``` ENCODE : aa4d7e6 FFMPEG : 8.0 LIBOPUS : 1.5.2 LIBSVTAV1_PSY : 3.0.2-B SVTAV1_PARAMS : film-grain=8:film-grain-denoise=1:tune=0:... VIDEO_PARAMS : -crf 25 -preset 3 -g 240 ``` Example usage: - standard usage: `encode -i input.mkv output.mkv` - print out what will be executed without starting encoding: `encode -i input.mkv -p` - encode with film-grain synthesis value of 20 with denoising: `encode -g 20 -i input.mkv` ## Estimate film-grain ```bash efg -i input [options] [-l NUM] low value (default: 0) [-s NUM] step value (default: 1) [-h NUM] high value (default: 30) [-p] plot bitrates using gnuplot [-I] system install at /usr/local/bin/efg [-U] uninstall from /usr/local/bin/efg ``` - Provides a way to estimate the ideal film-grain amount by encoding from low-high given values and the step amount. - Observing the point of diminishing returns, one can make an informed decision for a given film-grain value to choose. Example usage: - `efg -i input.mkv -p` ``` 1 +------------------------------------------------------------------------------------------------------+ | *****G***** + + + | | *****G** '/tmp/plot.dat' ***G*** | 0.95 |-+ ***** +-| | **G* | | *** | | **** | 0.9 |-+ *G* +-| | **** | | **** | 0.85 |-+ *G* +-| | *** | | **** | 0.8 |-+ *G* +-| | *** | | **** | | *G* | 0.75 |-+ *** +-| | **** | | *G* | 0.7 |-+ *** +-| | ** | | *** | | *G* | 0.65 |-+ *** +-| | **** | | + + + *| 0.6 +------------------------------------------------------------------------------------------------------+ ```