//  FTP_CaptureTwoAndDetect error return codes:
// 
//    (where * indicates used in FTP_CaptureAndDetect):
//
//  *  0 - Normal completion
//     1 - Capture thread 1 timed out while trying to write FF file
//     2 - Capture thread 2 timed out while trying to write FF file
//     3 - Main timed out waiting for capture thread 1 to finish frame
//     4 - Main timed out waiting for capture thread 2 to finish frame
//     5 - Main timed out waiting for capture thread 1 to fully wrap up
//     6 - Main timed out waiting for capture thread 2 to fully wrap up
//     7 - Main timed out waiting for writing thread 1 to fully wrap up
//     8 - Main timed out waiting for writing thread 2 to fully wrap up
//     9 - Main timed out waiting for process thread to fully wrap up
//  * 10 - Memory not allocated for working arrays
//    11 - Critical section not initialized
//    12 - Capture 1 thread not created
//    13 - Capture 1 thread could not begin
//    14 - Capture 2 thread not created
//    15 - Capture 2 thread could not begin
//  * 16 - Writing 1 thread not created
//  * 17 - Writing 1 thread could not begin
//    18 - Writing 2 thread not created
//    19 - Writing 2 thread could not begin
//  * 20 - Process thread not created
//  * 21 - Process thread could not begin
//  * 22 - Could not open output log file
//  * 23 - No video capture devices found
//    24 - Only one video capture device found - requires 2
//  * 25 - Unable to set up video capture device 1
//    26 - Unable to set up video capture device 2
//  * 27 - Twilight calculation error for very high latitudes