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