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ffmpeg install within existing Node.js docker image

I need to use ffmpeg in a Node.js application that runs in a docker container (created using docker-compose). I'm very new to Docker, and would like to know how to command Docker to install ffmpeg when creating the image.

DockerFile

FROM node:carbon
WORKDIR /usr/src/app

# where available (npm@5+)
COPY package*.json ./
RUN npm install -g nodemon
RUN npm install --only=production
COPY . .

EXPOSE 3000
CMD [ "npm", "start" ]


package.json:


"name": "radcast-apis",
"version": "0.0.1",
"private": true,
"scripts":
"start": "node ./bin/www",
"dev": "nodemon --inspect-brk=0.0.0.0:5858 ./bin/www"
,
"dependencies":
"audioconcat": "^0.1.3",
"cookie-parser": "~1.4.3",
"debug": "~2.6.9",
"express": "~4.16.0",
"firebase-admin": "^5.12.1",
"http-errors": "~1.6.2",
"jade": "~1.11.0",
"morgan": "~1.9.0"
,
"devDependencies":
"nodemon": "^1.11.0"




docker-compose.yml:

version: "2"
services:
web:
volumes:
- "./app:/src/app"
build: .
command: npm run dev
ports:
- "3000:3000"
- "5858:5858"


2 Answers
2

If it helps anyone, I figured out a way.

"ffmpeg-static": "^2.3.0"

ffmpeg_static = require('ffmpeg-static')

path

ffmpeg_static

ENV PATH="/your/path/to/node_modules/ffmpeg-static/bin/linux/x64:$PATH"

That worked a trick for us! The answer that saved us was an analogous use-case for firebase cloud functions - here.

ffmpeg-static will work fine, but it means that every time you change package.json, or anything above the COPY command for package.json, you'll have to wait for the npm install command to re-download the bins.

There is another method, using multi-stage builds. This method won't require re-downloading or rebuilding ffmpeg. There are prebuilt ffmpeg images at jrottenberg/ffmpeg.

For alpine, your image would look like this...

FROM jrottenberg/ffmpeg:3.3-alpine
FROM keymetrics/node:8-alpine

# copy ffmpeg bins from first image
COPY --from=0 / /


Related question: Copy ffmpeg bins in multistage docker build

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