lossless-cut/developer-notes.md

Contributing

Development setup

This app is built using Electron. Make sure you have at least Node v16. The app uses ffmpeg from PATH when developing.

npm install -g yarn

git clone https://github.com/mifi/lossless-cut.git
cd lossless-cut
yarn

Note: yarn may take some time to complete.

Installing ffmpeg

Run one of the below commands:

npm run download-ffmpeg-darwin-x64
npm run download-ffmpeg-darwin-arm64
npm run download-ffmpeg-linux-x64
npm run download-ffmpeg-win32-x64

For Windows, you may have to install 7z, and then put the 7z folder in your PATH.

Running

npm start

Building for production

See:

• https://www.electron.build/
• https://github.com/mifi/lossless-cut/blob/master/.github/workflows/build.yml

Building mas-dev (Mac App Store) build locally

This will sign using the development provisioning profile:

npm run pack-mas-dev

MAS builds have some restrictions, see isMasBuild variable in code. In particular, any file cannot be read without the user's consent.

NOTE: when MAS (dev) build, Application Support will instead be here:

~/Library/Containers/no.mifi.losslesscut-mac/Data/Library/Application Support

Starting over fresh

rm -rf ~/Library/Containers/no.mifi.losslesscut-mac

Windows Store

Windows store version is built as a Desktop Bridge app (with runFullTrust capability). This means the app has access to essentially everything the user has access to, and even internetClient is redundant.

• https://learn.microsoft.com/en-us/windows/uwp/packaging/app-capability-declarations
• https://learn.microsoft.com/en-us/archive/blogs/appconsult/a-simpler-and-faster-way-to-publish-your-desktop-bridge-applications-on-the-microsoft-store
• https://stackoverflow.com/a/52921641/6519037

Releasing

For per-platform build/signing setup, see this article.

Release new version

• Commit changes
• npm version ...
• git push && git push --tags
• Wait for build and draft in Github actions
• Open draft in github and add Release notes
• For files LosslessCut-mac-universal.pkg and LosslessCut-win-x64.appx add prefix -DO-NOT-DOWNLOAD
• Release the draft
• Bump snap version
• npm run scan-i18n to get the newest English strings and push so weblate gets them

Minimum OS version

Minimum supported OS versions for Electron. As of electron 22:

• MacOS High Sierra 10.13
• Windows 10

MacOS LSMinimumSystemVersion

How to check the value:

npm run pack-mas-dev
cat dist/mas-dev-arm64/LosslessCut.app/Contents/Info.plist

<key>LSMinimumSystemVersion</key>
<string>10.13</string>

LSMinimumSystemVersion can be overridden in electron-builder by mac.minimumSystemVersion

See also MACOS_MIN in ffmpeg-build-script.

Links:

• https://support.google.com/chrome/a/answer/7100626
• https://bignerdranch.com/blog/requiring-a-minimum-version-of-os-x-for-your-application/
• #1386

Maintainence chores

Keep dependencies up to date

• ffmpeg
• electron
• package.json

i18n

npm run scan-i18n

Licenses

Generate summary

npx license-checker --summary

Regenerate licenses file

npm run generate-licenses
#cp licenses.txt losslesscut.mifi.no/public/

Then deploy.