Changing Sequencer Audio Track "Start Frame Offset" in code or Blueprint

Development Programming & Scripting
1

Hi, a (hopefully) simple question: Is it possible to modify the “Start Frame Offset” property of an Audio Track Section in a Sequence in Blueprint or C++ code? I see a few Blueprints related to that but I can’t seem to figure out the correct things to hook together to make them work. :slight_smile:

We are making a music game and we would like to apply an offset to the audio track based on an AV sync calibration that we run on startup.

Thanks!

2

In case anyone else is wondering, here is the C++ code I ended up with. I wasn’t able to figure out how to do it in BP.

void ApplyCalibrationToSequence(ALevelSequenceActor *target)
{
	const TArray < UMovieSceneTrack* >& masterTracks = target->SequencePlayer->GetSequence()->GetMovieScene()->GetMasterTracks();
	for (int t = 0; t < masterTracks.Num(); t++)
	{
		const TArray < UMovieSceneSection* >& sections = masterTracks[t]->GetAllSections();
		for (int s = 0; s < sections.Num(); s++)
		{
			if (sections[s]->GetClass() == UMovieSceneAudioSection::StaticClass())
			{
				UMovieSceneAudioSection* audioSection = Cast<UMovieSceneAudioSection>(sections[s]);
				audioSection->SetStartOffset(FFrameNumber(CalibrationOffsetFrame));
			}
		}
	}
}