startTimecode
Enter the start timecode in the base input video for this overlay. Your overlay will be active starting with this frame. To display your video overlay starting at the beginning of the base input video: Leave blank. Use the format HH:MM:SS:FF or HH:MM:SS;FF, where HH is the hour, MM is the minute, SS is the second, and FF is the frame number. When entering this value, take into account your choice for the base input video's timecode source. For example, if you have embedded timecodes that start at 01:00:00:00 and you want your overlay to begin five minutes into the video, enter 01:05:00:00.