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apps/website/docs/faq.md

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 # FAQ
+
+### What is the license of ffmpeg.wasm?
+
+There are two components inside ffmpeg.wasm:
+
+- @ffmpeg/ffmpeg (https://github.com/ffmpegwasm/ffmpeg.wasm)
+- @ffmpeg/core (https://github.com/ffmpegwasm/ffmpeg.wasm-core)
+
+@ffmpeg/core contains WebAssembly code which is transpiled from original FFmpeg C code with minor modifications, but overall it still following the same licenses as FFmpeg and its external libraries (as each external libraries might have its own license).
+
+@ffmpeg/ffmpeg contains kind of a wrapper to handle the complexity of loading core and calling low-level APIs. It is a small code base and under MIT license.
+
+### What is the maximum size of input file?
+
+2 GB, which is a hard limit in WebAssembly. Might become 4 GB in the future.
+
+### How can I build my own ffmpeg.wasm?
+
+In fact, it is `@ffmpeg/core` most people would like to build.
+
+To build on your own, you can check [Contribution Guide](/docs/contribution/core)
+
+Also you can check this series of posts to learn more fundamental concepts
+(OUTDATED, but still good to learn foundations):
+
+- https://jeromewu.github.io/build-ffmpeg-webassembly-version-part-1-preparation/
+- https://jeromewu.github.io/build-ffmpeg-webassembly-version-part-2-compile-with-emscripten/
+- https://jeromewu.github.io/build-ffmpeg-webassembly-version-part-3-v0.1/
+- https://jeromewu.github.io/build-ffmpeg-webassembly-version-part-4-v0.2/