Video frame index
|Total Length||9 bytes|
Video frame index = Data1 * 2^24 + Data2 * 2^16 + Data3 * 2^8 + Data4 if (Data6 & 0x80) = 0
Video PTS = Data1 * 2^24 + Data2 * 2^16 + Data3 * 2^8 + Data4 if (Data6 & 0x80) = 1
GOP averaged video system CPU load = Data5 * 0.5 (from 0 to 127.5%)
Free A/V buffers = Data6 and 0x0F (from 0 to 15)
Top half of Data6 is for future expansion.
Free MPG CF write blocks = Data7
This message is used to provide synchronization between the data file and the video file and checking the health status of the video system.