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28 lines
1.3 KiB
Markdown
# JavaScript expressions
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LosslessCut has support for JavaScript expressions in certain dialogs. This is a base JavaScript environment with [core JavaScript functionality](https://developer.mozilla.org/en-US/docs/Web/JavaScript) available for you to use.
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## Select segments by expression
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You will be given a global variable called `segment` (type [`Segment`](generated/types.md#segment)) and you can create an expression that returns `true` or `false` based on custom logic. For example to select all segments with a duration of less than 5 seconds use this expression:
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```js
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segment.duration < 5
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```
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## Edit segments by expression
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LosslessCut has support for normal JavaScript expressions. You will be given a variable `segment` (type [`Segment`](generated/types.md#segment)) for each selected segment and can return a new segment with modified properties.
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See more examples in-app.
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## Output name template
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You can also use JavaScript expressions when referring to variables inside `${}` in output file name templates, e.g. `${FILENAME.toLowerCase()}`.
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See also [Export file name template](file-name-template.md).
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## Select tracks by expression
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For available variables, open the *Tracks* dialog, then for the respective track, open *Track info* and you will see all available variables which you can use in your filter.
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