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README.md

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FFmpeg.wasm Core
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FFmpeg Wasm LGPL2.1 Build
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================
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[![Node Version](https://img.shields.io/node/v/@ffmpeg/ffmpeg.svg)](https://img.shields.io/node/v/@ffmpeg/ffmpeg.svg)
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![FFmpeg.wasm Core](https://github.com/ffmpegwasm/ffmpeg.wasm-core/workflows/FFmpeg.wasm/badge.svg?branch=n4.3.1-wasm)
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![npm (tag)](https://img.shields.io/npm/v/@ffmpeg/core/latest)
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[![Maintenance](https://img.shields.io/badge/Maintained%3F-yes-green.svg)](https://github.com/ffmpegwasm/ffmpeg.wasm-core/graphs/commit-activity)
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[![Downloads Total](https://img.shields.io/npm/dt/@ffmpeg/core.svg)](https://www.npmjs.com/package/@ffmpeg/core)
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[![Downloads Month](https://img.shields.io/npm/dm/@ffmpeg/core.svg)](https://www.npmjs.com/package/@ffmpeg/core)
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This repositiory can be used to replicate the transpilation process of c/c++ code (FFmpeg) to Wasm.
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This is the core part of FFmpeg.wasm where we transpile C/C++ code of FFmpeg to JavaScript/WebAssembly code. It is still very experimental (and slow), but shows the possibilities of using FFmpeg purely in the browser.
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If you have any issues for this repository, please put it here: https://github.com/ffmpegwasm/ffmpeg.wasm/issues
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## Setup
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```
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$ git clone https://github.com/ffmpegwasm/ffmpeg.wasm-core
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$ git submodule update --init --recursive
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```
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You can find the output binaries [here](https://github.com/konstantin-paulus/ffmpeg.wasm-lgpl-build/tree/n4.3.1-wasm/wasm/packages/core/build)
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## Build
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If nothing goes wrong, you can find JavaScript files in `wasm/packages/core/dist`.
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## Test
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Once the build completes, you can test with following scripts:
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## Configuration
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```
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$ cd wasm
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$ npm install
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$ npm test
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--target-os=none --arch=x86_32 --enable-cross-compile --disable-x86asm --disable-inline-asm --disable-stripping --disable-programs --disable-doc --disable-debug --disable-runtime-cpudetect --disable-autodetect --extra-cflags='-O3 --closure 1 -I/src/build/include -s USE_PTHREADS=1' --extra-cxxflags='-O3 --closure 1 -I/src/build/include -s USE_PTHREADS=1' --extra-ldflags='-O3 --closure 1 -I/src/build/include -s USE_PTHREADS=1 -L/src/build/lib' --pkg-config-flags=--static --nm=llvm-nm --ar=emar --ranlib=emranlib --cc=emcc --cxx=em++ --objcc=emcc --dep-cc=emcc
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```
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## Configuration
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#### Base
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| Library/Tool Name | Version | Remark |
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| ----------------- | ------- | ------ |
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| Emscripten | 2.0.8 | |
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| FFmpeg | 4.3.1 | |
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#### Video
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| Library/Tool Name | Version | Remark |
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| ----------------- | ------- | ------ |
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| x264 | 0.160.x | mp4 format |
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| x265 | 3.4 | mp4 format, only works with `-pix_fmt yuv420p10le` and `-pix_fmt yuv420p12le` |
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| libvpx | 1.9.0 | webm format |
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| theora | 1.1.1 | ogv format |
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| aom | 1.0.0 | mkv format, extremely slow (takes over 120s for 1s video), not recommended to use |
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#### Audio
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| Library/Tool Name | Version | Remark |
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| ----------------- | ------- | ------ |
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| wavpack | 5.3.0 | wav/wv format |
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| lame | 3.100 | mp3 format |
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| fdk-aac | 2.0.1 | aac format |
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| ogg | 1.3.4 | required by vorbis |
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| vorbis | 1.3.6 | ogg format |
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| opus | 1.3.1 | opus format |
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#### Image
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| Library/Tool Name | Version | Remark |
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| ----------------- | ------- | ------ |
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| libwebp | 1.1.0 | webp format |
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#### Others
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| Library/Tool Name | Version | Remark |
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| ----------------- | ------- | ------ |
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| freetype2 | 2.10.4 | font file support |
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| fribidi | 1.0.10 | Arabic and Hebrew alphabets support |
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| harfbuzz | 2.7.4 | text shaping engine |
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| libass | 0.15.0 | SSA/ASS subtitles rendering library |

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