This will be a short post, and here I will show you how to fix cropped PAL video on the Eachine ProDVR. The ProDVR is probably the cheapest DVR on the market and works very well. However, it has for a long time had an issue where the bottom few lines would be removed from the picture if your system was using PAL. This is especially an issue if you have an OSD and want it to show up in your recordings. However, a new firmware has been released which fixes this issue, and this is how you use it.
Warning: Flashing new firmware risks bricking your DVR and I am not aware of any method to recover bricked DVRs. This process worked perfectly for me but I am not responsible if you brick your DVR attempting this.
Flashing the new firmware
This is a very simple task. This is what you do:
- Download the firmware from here.
- Format your MicroSD card. It should be set to the FAT32 filesystem.
- Copy the file CRESFW.BIN to the root of the MicroSD card.
- Insert the MicroSD into the DVR and power it on.
- You should see the LED on the DVR blink in an alternating fast/ slow pattern. Wait for the LED to turn off and power off the DVR. Do not remove power while it is still blinking.
- Power it on again and change whatever settings you need to in the OSD menu, as it will have been reset to factory defaults after the firmware flash.
The correct power sequence
However, flashing the new firmware is not enough to fix the PAL cropping. If your system is on PAL, the DVR must already be receiving a video signal when it is powered on or else it will crop the video. This means you need to power on your quadcopter and video receiver before you power on the DVR. This was an issue on my system as I use the FR632 diversity video receiver, and it needs the power button to be held for a few seconds to switch on, whereas the DVR would switch on as soon as power is applied. The solution was quite simple, I just added a switch to the 5V power supply to the DVR. This allows me to power on my quadcopter, the goggles and video receiver and then use the switch to turn on the DVR.