Fesi’s Reaction Sensitivity and Silence Delay settings answer different questions. Sensitivity affects how readily a reaction begins. Silence Delay governs the inactivity period used when an automatic reaction has quieted down.
If a clip starts too readily, changing its ending delay is not the same as changing the trigger. If the ending feels abrupt, increasing sensitivity alone may not address the part of the workflow you meant to adjust.
Start with the symptom
Watch the original clip and identify whether the issue is the opening, the ending or an unwanted capture. A missing opening is different from a pause near the end, and both differ from a recording that was interrupted when you left the app.
Use the sensitivity guide for testing unwanted or missed triggers. Use the interruption guide if an app switch or screen lock happened. This article focuses on how inactivity affects an automatic clip’s ending.
What Silence Delay measures
The setting offers a choice of inactivity delays. Fesi’s detection combines reaction signals, so “silence” should not be interpreted as a promise to stop exactly a fixed number of seconds after the last audible word.
The iOS capture engine tracks ongoing reaction activity and checks its inactivity timeout after activity drops below its continuation level. Renewed activity can continue the reaction. Android’s automatic recorder similarly uses an inactivity timer that can be canceled by continuing activity.
A silent physical reaction can therefore matter differently from a completely inactive pause. The setting is not simply measuring whether your mouth is making sound.
Why the final clip is not a fixed-length timer
A delay choice is not a request for every video to have that total duration. Trigger timing, continuing activity and capture limits also affect the result. You should not expect a four-second setting to produce only four-second recordings.
Likewise, changing the setting for a later session does not extend footage in an existing clip. If the original did not capture the ending you wanted, a new preference cannot reconstruct it.
Test one change between sessions
- Keep your usual phone position, lighting and sensitivity.
- Record a short test containing a natural reaction and a brief pause.
- Review the end of the original clip.
- Finish the session, change only Silence Delay and repeat.
- Compare whether the ending better fits the way you react.
Android prevents changing the inactivity delay during an active session. Making changes between sessions also helps you tell which setting produced each result.
Leave editing for footage you already have
If the ending contains more footage than you want, trimming can shorten the existing recording without changing the source. That is an editing decision rather than a reason to retune every later capture.
The Trim & Share guide explains choosing a useful ending. For a recurring capture issue, record what happened and use the feedback labels alongside a controlled settings test.