When reviewing the BrightSign log, what does "Video Format" followed by a number refer to?
[338895.079] *** 94:08:01.965 b_playback_ip: sourceChangedCallback: res: source 1280x720, coded 1280x720, display 1280x720, ar 0, fr 2, interlaced 0 video format 34, muted 0
[338895.079] *** 94:08:01.965 b_playback_ip: sourceChangedCallback: res: source 1280x720, coded 1280x720, display 1280x720, ar 0, fr 2, interlaced 0 video format 36, muted 0
[337285.812] *** 93:41:12.699 b_playback_ip: sourceChangedCallback: res: source 640x480, coded 640x480, display 640x480, ar 0, fr 4, interlaced 0 video format 24, muted 0