Select an audio track in the Storyboard or Timeline, then choose Audio Marker Assistant… de la menu or the context menu in the Storyboard to open the assistant.
barre de menu. En haut, vous verrez la forme d'onde audio et les boutons de lecture. Vous pouvez faire défiler la forme d'onde. Utilisez le curseur d'échelle ou un geste de pincement à deux doigts sur un trackpad pour zoomer dans la forme d'onde et révéler plus de détails.
L'assistant a deux flux de travail différents : Automatique et Manuel. Laquelle des deux est la plus appropriée dépend du type de musique que vous utilisez :
- La musique pop, rock ou dance avec un rythme régulier convient à la création de marqueurs automatiques.
- Classical music or soundtracks that often changes tempo may be more suitable for manual marker creation.
Once you click on , the slides above the audio item are automatically set to continue “At Audio Marker” and their durations are adjusted, so that animation speeds will stay the same.
Marqueurs manuels
In manual mode you basically just play the audio and press the M key or the big button in the middle with the beat of the music to add new markers. Play the audio again from the start to review the accuracy of the markers.
If a marker is slightly off, then simply drag it to the correct location. Click on ⊗ at the top of a marker to delete the marker. Markers are only used during playback if they are active. Click on the bottom circle of a marker to toggle its active state.
Création automatique de marqueurs
Switch to Automatique if you know that a song has a steady beat (which is often the case for pop or rock music). Click on to automatically determine the BPM (beats per minute) and Décalage values. This usually works quite well for pop, rock, or techno music, but it is less reliable for orchestra music, like soundtracks or classical music.
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If the BPM value was determined correctly, but the Offset is incorrect, then simply press the ⌥ key and drag a marker to move all markers simultaneously – that way you can fix the offset by visually matching the markers to the waveform.
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If you already know the BPM and Offset values you can also enter the BPM and Offset values numerically in the text fields.
Moving Markers
If one or more markers are slightly off, you can reposition them in various ways:
- Drag a marker line to move just this single marker
- Appuyer sur la touche ⌥key and drag a marker to move all markers at once. This is the same as adjusting the Offset value.
- Click on the diamond shape of a marker to make this marker the “anchor” for the following step.
- Appuyer sur la touche ⌘ key and drag any other marker but the anchor to spread markers in an equidistant fashion. This is the same as adjusting the BPM value.
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Please bear in mind that this will be more accurate, if the anchor and the dragged marker are far apart. This way you can quickly get pretty accurate markers for a steady music beat – this works well for pop and rock music, less so for classical music.
Activating Markers
If you have a marker for every beat in a song that is obviously way too fast for switching slides. For this reason you should only activate a marker every once in a while. You get the most pleasing effect, if you know the meter of the song (e.g. 4/4 or 3/4) and then select if you want an active marker at every bar, every 2 bars, or every 4 bars.
You can also manually activate or deactivate markers by clicking on the bottom circle of a marker. An active marker will have a checkmark and is displayed in opaque red, while an inactive marker is transparent.
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For a song with 4/4 meter and activating at every second bar, this would be every 8th marker.
Synchronisation des diapositives
Adding markers to an audio track is the first step syncing slides with audio. The second step is performed automatically when you click on the button: All slides above the audio track are switched to continue “At Audio Marker” and their durations are automatically adjusted so that animation speeds are still correct.
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If for any reason slides are later switched to a different continue type, then synchronisation might be lost. In this case simply with switch back to continue “At Audio Marker”.
Once you have added audio markers to your audio track, all you have to do is select all slides above the audio track, open the the Options des diapositiveset sélectionnez Continuer au marqueur audio. Les transitions des diapositives sont maintenant parfaitement synchronisées avec la musique !
