Video Element custom start time

Is there a way to set a non-zero start time on a YouTube video? I created a custom field for the number of seconds to jump ahead to avoid annoying intros, but I haven’t been able to implement it. I then tried to add ?t={my_dynamic_start_field} after my dynamic video ID field, but that just created a URL like: youtubeid?t=10?othersettings=theirvalues&moresettings=morevalues.

Am I missing something?