In AudioLabeler, is it possible to export the frame # for each label?

I am using AudioLabeler to load a video file to view the audio signal. When I export my labels, I only get the time information, but I would also like to export the frame #. Is that possible?

Answer 1

[Abhijeet]

Hi,

Yes, it is possible to export the frame number along with the time information when exporting labels from AudioLabeler.

In AudioLabeler, when you export labels, you can choose the export format. The default export format is CSV, but you can also export in other formats such as Excel or MATLAB.

If you export to the MATLAB format (.mat), you can export the frame number along with the time information by setting the 'SamplingRate' and 'StartFrame' fields of the exported struct.

For example, if your video has a frame rate of 30 frames per second and you want to export labels for a range of time from 1.5 seconds to 2.5 seconds, you can do the following:

video = VideoReader('myvideo.mp4');
label = audioLabeler(video);

% Define the range of time for the labels 
startTime = 1.5; 
endTime = 2.5;

% Get the frame number for the start and end times 
startFrame = round(startTime * video.FrameRate) + 1; 
endFrame = round(endTime * video.FrameRate); 

% Export labels to a .mat file 
exportLabels(label, 'mylabels.mat', 'Format', 'mat', ... 'SamplingRate', video.FrameRate, 'StartFrame', startFrame); 

When you load the exported .mat file into MATLAB, you can access the labels along with the frame number by using the 'Time' and 'Frame' fields of the struct.

Thanks

[Kelsey Anbuhl]

This is very helpful, thank you!