How can I add an effect at a specific part in a video?

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Trimming Filters

Trimming a filter means you can choose when the filter effect starts and ends independent of the clip’s starting and ending time. Obviously, if the filter is applied to a clip, it must still be within the clip’s time frame. If the filter is applied to a track, however, it can be truly independent. Filter trimming takes place in the Keyframes panel: [image] The first row of the Keyframes panel shows the clip with its thumbnails and audio waveform. Drag the left, green edge to change when the f…