FFMPEG.js is an amazing project and it helped me building one of my latest projects: Device Frame. It basically builds ffmpeg (with a good set of defaults to keep the size small — as small as it can be). If the default build doesn’t support the filters and encoders you need, then you will need to build it yourself.

This is more of a note for me in the future, but this is what I did to get it working. (Note: I tried on macOS sierra and was getting compile errors).

Install Deps

1. sudo apt-get install automake libtool build-essential cmake

Download ffmpeg.js

1. git clone git@github.com:Kagami/ffmpeg.js.git
2. cd ffmpeg.js
3. git submodule init
4. git submodule update --recursive

Install Emscripten:

1. Linux: Download
2. ./emsdk update
3. ./emsdk install latest
4. Wait…
5. ./emsdk activate latest
6. source ./emsdk_env.sh

Build ffmpeg.js

• make all

If there are errors with fribidi:

• cd build/fribidi/ && ./bootstrap && configure

You might see errors like:

./configure: line 4255: syntax error near unexpected token `2.2'
./configure: line 4255: `LT_PREREQ(2.2)'

Make sure you have libtool installed.

Done.

Paul Kinlan

Trying to make the web and developers better.