Why Boundaries Matter
Every marker in 12scribe has two timestamps: a start time and an end time. Together, these boundaries define the exact audio segment that the marker represents. When you tap a marker during playback, the app jumps to the start time. When you extract, share, or export a marker's audio segment, the boundaries determine exactly what gets included.
Markers created during live recording get their start and end times automatically from the buffer setting. The start time is calculated as the moment you tapped minus the buffer duration, and the end time is set to the moment of your tap. These automatic boundaries are usually reasonable, but they are rarely perfect — fine-tuning them after the session makes your markers more precise and your review workflow more efficient.
Precise boundaries matter most in two scenarios: when you want to jump to a marker during playback and land exactly at the beginning of the relevant content (not 15 seconds of preamble), and when you share or extract a marker's audio segment and want it to contain only the relevant material without awkward leading or trailing silence.
How to Edit Boundaries
Open the marker editor by tapping a marker in the marker list and selecting Edit. The time adjustment controls appear as two separate fields — one for the start time and one for the end time. You can modify each independently using several methods:
- Fine controls — tap the plus or minus buttons to move a boundary by one second at a time. This is ideal for precise adjustments when you know the content starts just a few seconds before or after the current position.
- Direct input — tap the timestamp value and type an exact time (minutes:seconds) if you know the precise position from watching the waveform or reading the transcript.
- Drag handles — on the waveform view, drag the boundary handles left or right for larger adjustments. The waveform visual helps you identify natural break points between content and silence.
While adjusting, use the playback preview to hear the audio around each boundary. Tap the play button next to either timestamp to hear what the marker sounds like with the current boundaries. This way you can position the start right before the important content begins and the end right after it concludes, cutting out irrelevant speech and silence.
The editing process works best in three steps:
- Play the marker from its current start point and listen carefully for where the important content actually begins — the real start of the relevant statement or explanation
- Adjust the start time forward or backward to align precisely with the beginning of the content
- Adjust the end time so it captures the complete thought, conclusion, or sentence without trailing into the next unrelated topic
Precision Tips
Getting marker boundaries right takes a little practice, but these strategies will help you become efficient quickly:
- Listen before adjusting — always play the marker's audio segment before moving any boundaries. Your ears are better than your eyes at finding the right cut point. What looks like a clean break in the waveform might be mid-sentence.
- Use the waveform — the visual waveform display shows peaks and valleys in the audio signal. Silence appears as flat lines, making it straightforward to spot natural break points between topics, sentences, or speakers.
- Trim from the start first — markers created during recording often include several seconds of irrelevant content before the important moment, because the buffer captures audio before your tap. Start by trimming the front of the marker to remove this preamble.
- Match complete thoughts — for lecture markers, try to align boundaries with complete sentences or complete ideas rather than cutting mid-sentence. A marker that starts with "...and therefore" is less useful than one that starts with the full sentence.
- Check the transcript — if the recording has been transcribed, read the transcript text for the marker's time range. This tells you exactly where sentences begin and end, making it easy to choose precise boundary points.
Well-tuned boundaries are especially important if you plan to share markers with colleagues, export audio segments for study materials, or use markers as reference points during presentations. Clean, precise cuts make shared content more professional and immediately usable. See Edit Markers for other editing options beyond time boundary adjustment.