gpfup_before_upload (JS)

gform.addAction( 'gpfup_before_upload', my_custom_function );

/**
 * Gravity Perks // File Upload Pro // Limit Duration of MP4/MOV Files
 * https://gravitywiz.com/documentation/gravity-forms-file-upload-pro/
 *
 * Instructions:
 *   1. Install our free Custom Javascript for Gravity Forms plugin.
 *      Download the plugin here: https://gravitywiz.com/gravity-forms-code-chest/
 *   2. Copy and paste the snippet into the editor of the Custom Javascript for Gravity Forms plugin.
 */
window.gform.addAction('gpfup_before_upload', (formId, fieldId, file, up, gpfupInstance) => {
	// Update "10" to the desired number of seconds.
	var maxDurationInSeconds = 10;

	const videoMimeTypes = ['video/mp4', 'video/quicktime'];

	if (videoMimeTypes.indexOf(file.type) !== -1) {
		var fileURL = URL.createObjectURL(file.getNative());
		var vid = document.createElement('video');
		vid.src = fileURL;

		// wait for duration to change from NaN to the actual duration
		vid.ondurationchange = function () {
			if (this.duration > maxDurationInSeconds) {
				gpfupInstance.handleFileError(up, file, {
					code: 'does_not_meet_max_duration',
					message: 'Video duration cannot exceed  ' + maxDurationInSeconds + ' seconds.',
				});
			}
		};
	}
});

/**
 * Gravity Perks // File Upload Pro // Set Total Maximum File Size
 * https://gravitywiz.com/documentation/gravity-forms-file-upload-pro/
 *
 * Specify a total max file size (the maximum size accepted collectively for all files in a given field).
 * If a new file is uploaded that exceeds the collective max file size, a validation error will be
 * displayed for that file.
 *
 * Instructions:
 *  1. Install our free Custom Javascript for Gravity Forms plugin.
 *     Download the plugin here: https://gravitywiz.com/gravity-forms-code-chest/
 *  2. Copy and paste the snippet into the editor of the Custom Javascript for Gravity Forms plugin.
 */
window.gform.addAction( 'gpfup_before_upload', (formId, fieldId, file, up, gpfupInstance) => {
	// Specify max total size of all files combined in megabytes.
	var maxTotalSize = 1;
	var totalSize    = 0;

	gpfupInstance.$store.getters.allFiles.forEach( function( file ) {
		if (file.error) {
			return;
		}

		totalSize += file.size;
	} );

	if ( totalSize > maxTotalSize * 1000000 ) {
		file.type = 'application/octet-stream'; // Prevent image processing

		gpfupInstance.handleFileError( up, file, {
			code: 'too_much_file',
			message: 'Max total file size of ' + maxTotalSize + 'MB has reached.',
		} );

		up.stop();
		up.start();
	}
} );