Skip to main content

Filters

In FFmpeg, filters is useful when we need to manipulate each frame of a video. But using FFmpeg command-line to build a filter link or graph can be difficult sometimes. Now here, we can use JavaScript way to build a graph, both flexible and easy to read.

Example​

let video = await fflow.source('./test.avi')
await video.trim({start: 1, duration: video.duration})
           .setVolume(0.5)
           .exportTo('./out_test.mp4')

This example apply trim and setVolume filter operations which support chainable operation. Each filter operation returns a new TrackGroup.

⚠️ Note that there are some difference between these filter operations and FFmpeg filters. They are not one-to-one correspondence. For example, in FFmpeg, we apply trim to video track (stream) and atrim to audio track (stream). But here, TrackGroup.trim() apply either trim or atrim to each internal track (stream). They are smart enough to build and process.

Filter list​

Here is list of current filters (functions) avaible:

  • trim
  • loop
  • setVolume
  • setDataFormat
  • concat
  • group
  • merge

Each one can be check in Filters API