DVR ( Digital Video Recorder)
A digital video recorder (DVR) is an electronic device that records video in a digital format to a disk drive, USB flash drive, SD memory card, SSD or other local or networked mass storage device. The term includes set-top boxes with direct to disk recording, portable media players and TV gateways with recording capability, and digital camcorders.Personal computers are often connected to video capture devices and used as DVRs; in such cases the application software used to record video is an integral part of the DVR. Many DVRs are classified as consumer electronic devices; such devices are sometimes referred to as personal video recorders (PVRs).
A digital camcorder combines a camera and a digital video recorder.
Some DVD-based DVRs incorporate connectors that can be used to capture digital video from a camcorder. Some editing of the resulting DVD is usually possible, such as adding chapter points.
Some digital video recorders can now record to solid state flash memory cards (called flash camcorders). They generally use Secure Digital cards, can include wireless connections (Bluetooth and Wi-Fi), and can play SWF files. There are some digital video recorders that combine video and graphics in real time to the flash card, called DTE or “direct to edit”. These are used to speed-up the editing workflow in video and television production, since linear videotapes do not then need to be transferred to the edit workstation .
File formats, resolutions and file systems
DVRs can usually record and play H.264, MPEG-4 Part 2, MPEG-2 .mpg, MPEG-2 .TS, VOB and ISO images video, with MP3 and AC3 audio tracks. They can also display images (JPEG and PNG) and play music files (MP3 and Ogg).
Some devices can be updated to play and record in new formats. DVRs usually record in proprietary file systems for copy protection, although some can use FAT file systems. Recordings from standard-definition television usually have 480p/i/576p/i while HDTV is usually in 720p/1080i.
Source: WIKI PEDIA
So guys this was something wikipedia knows about DVR, Lets suppose that we need a DVR for Recording the downlink from our drone inorder to recover the drone if crashed or lost we can just replay the footage and check the approx. location DVR in RC can be of most use if used correctly well DVR has been playing a important role to capture the moments and help finding the drone if the drone is lost of the Hd recording camera is lost or couldnt record.
In drone racing DVR is used either on the goggles dvr or used with external VRx to record the flight.
Very Important Things to remember when buying a DVR:
1.) All DVR’s are not the same.
2.) Always check the specification of the DVR inorder to support your current equipment like the input and output ports.
3.) Check the V and A required for the DVR to work.
4.) Always check the Youtube Reviews of the DVR you decide the buy.
5.) Some DVR claim to record HD but they arent HD surely in the case of cheap chinese clones but they do provide a good quality at price most of the times.
6.) Cheap DVR need not always give you a clean footage due to the manufacturing there may be noise in the video ( static lines or interference).
7.) Check the format of Disk they support Eg: NTFS/FAT32
8.)Check the video frames per second the DVR records at, most common ones is 30fps.
9.)Check the type of camera they support PAL or NTSC.
10.)Last thing you need to check is the Resolution that it records in.
THESE ARE SOME OF THE CHEAP DVR’s COMMONLY USED YOU CAN CLICK ON THEM AND BUY THEM:
Item Name: Mini DVR Video Audio Recorder
Power input: 5V
Weight: Only 10g
Note: It also can support PAL format, but the Pixels is not fixed enough. So the photo will be incomplete.
It will lack of up and down image.
Brand name: Eachine
Item name: ProDVR Video Audio Recorder
Operating Voltage: DC 5V
Video Format: NTSC/PAL
Video Output Size: VGA(640*480px)D1(720*480)HD(1280*480)
Light Frequency: 50HZ/60HZ
Compress Format: MJPEG
Records Frame Rate: 30 Frames
Max Support: 32G TF Card
Weight: only 9.5g
The perfect accessory for your FPV system! This SD DVR (Digital Video Recorder) allows you to easily record everything you see and hear from your FPV model’s camera directly to an SD card. This eliminates the need for bringing your laptop to the field for video recording.
Item Name: Digital Video Recorder
Card Format: SD
A/V Input: 3.5mm plug
A/V Output: 3.5mm plug
Frame Rate: selectable 5/15/30fps
Resolution: selectable 320×288/640×576/704×576
Voltage Input Range: 5~30V DC
This device features and A/V input and output allowing you to connect it in-line with your FPV system. The input source will be recorded directly to the SD card, while the A/V output will carry the signal on to your TV, monitor or FPV goggles.
Even includes an IR remote control for easy setting adjustment such as resolution, video quality, volume, timer functions and more. The menu system will be displayed via the A/V output to your TV, monitor or FPV goggles.
Utilizes popular SD card format
A/V input and output
IR remote control included
Wide voltage input range (5~30V DC)
Video compressed format: MPEG4 , files format: AVI
Photo format: JPGE
High Resolution LCD: 2.4″, TFT true color LCD;
Audio and video output: RCA 3-in-1 AV output;
Storage type: hard disk and SD card(FAT 32 ,support over 32G);
Video size and speed: PAL: 720×576(D1)/25FPS, NTS: 720×480(D1)/30FPS
Bit Rate: 8mb/S
Power supply for external camera is available: Voltage: 5V max. current: 400 mA;
Video format: NTSC/PAL;
Multi record mode: Manual/Auto/Motion detection
Real-time recordings are marked in File;
Compute transfer screen: USB2.0;
Recording time: 1minute~2.5 hours /1G ;
Power consumption: 200mA , 3.7V 1000 mAH chargeable Li-ion battery, 5.0V 2A AC Adapter;
Size: 79 mm x 51 mm x22 mm;
Weight:85g (including battery)