Regarding using DatCon/CsvView to process a .DAT log file. It depends on which DJI platform you're interested in. The more recent platforms will have encrypted .DAT log files and can't be processed by DatCon/CsvView. AFAIK these platforms and...
Unlikely to be significant because the selected video recording quality setting is being recorded directly to the drone microSD card, while the FPV video display setting on the device, which is transmitted by the 4G dongle to it, is not user...