Questions tagged [video]

Specify video format, e.g. NTSC, ATSC, VGA, etc.

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29 votes
3 answers
18k views

Why does VGA have so many ground pins (compared to DVI-I for example)?

If you look at the pinout for VGA, there are several ground pins: I was curious as to why, and I found this answer. To sum it up, the extra ground pins are so that each pin has its own ground in ...
24 votes
2 answers
7k views

What is this inductor symbol from a video circuit?

This is from the datasheet for the TDA8217 PAL decoder and video processor. This is the "Applicaton Diagram". The circled item is unfamiliar to me, I asked at my local electronic components ...
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20 votes
2 answers
5k views

What is the purpose of this device?

I found this device in my father's basement, but I can't figure out what this device is. It has only 1 SCART connector, 1 power cable and only 1 button in front of it. I think it may be some old video ...
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16 votes
4 answers
2k views

Where do I start with embedded video? [closed]

My boss recently asked me how difficult it would be to design a product that could continually record fairly low quality video and store the last few hours in some form of internal memory. I have ...
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16 votes
4 answers
24k views

What is a digital video port?

I see a few questions here casually mention that image sensor modules have a "standard parallel digital video port (DVP) or ... MIPI high-speed serial interface" "Where do I start with embedded video?...
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14 votes
2 answers
2k views

Generating PAL tv signal using a PIC

I'm trying to generate PAL tv signals using a PIC24FJ64GB002 using a similar method to the circuit described half way down this page. The only difference is that my circuit needs to run at 3v instead ...
  • 2,067
12 votes
2 answers
11k views

How do analog video signals work

I have always wondered how an only 1 wire line (signal and ground) can make a whole color image appear on a screen full of thousands of pixels. How exactly do these signals work and what ...
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12 votes
1 answer
481 views

Troubleshooting a faulty filter circuit in a PAL CRT display

I have an old CRT monitor (Phillips CM8833) which I am attempting to repair. When displaying a composite PAL signal, it only shows a black and white image, but it is still able to display RGB signals ...
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9 votes
4 answers
4k views

Why can't analog video be compressed like digital video (example inside)?

I'm learning the basics of analog and digital TV signals and I came across this (original link, now gone) short article (see the next page as well). Why can't analog video signals be compressed in ...
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8 votes
4 answers
3k views

Why do most FPV 5.8 GHz video transmitters use PAL or NTSC?

I am not much into the details of video transmission in general. However, I wonder since most displays and electronics are digital, why have suppliers for FPV equipment chosen an analog transmission ...
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8 votes
2 answers
1k views

Does VGA have to be drawn at 60hz?

I'm wanting to generate a VGA signal hopefully as painlessly as possible. I have an odd question though. Everywhere I see that VGA requires a 25MHz clock for the sync signals. Is it possible to ...
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7 votes
3 answers
2k views

Learning videos for electronic concepts?

Are there any interesting and graphical videos for learning electronic concepts, like basic principles of capacitor, inductor, resistor, transistor and other advanced concepts like digital electronics?...
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7 votes
5 answers
4k views

How can I control a CGA screen with an Arduino?

I'm getting one of these http://www.old-computers.com/museum/computer.asp?st=1&c=446 I'm planning to build a server inside it. And I was thinking of using the built in CGA-monitor as a ...
6 votes
5 answers
7k views

VGA to HDMI converter

I'm making a little project purely as a hobby using a small FPGA breakout board. I'm outputting VGA video which works fine, but would like HDMI output instead so I can connect to a television that has ...
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6 votes
3 answers
2k views

Video Home System (VHS) bandwidth

Standard play VHS video cassette recorders offered only about 3 MHz luminance bandwidth by recording the signal on an FM carrier. What is that carrier frequency? Is it possible to confirm the carrier ...
6 votes
2 answers
917 views

Why the audio subcarrier is never transmitted with baseband analogue video signal?

In the era of analogue video, when you needed to connect a local video source (STB, VCR, game console, DVD player, etc.), the most ubiquitous way to do so, next to using an RF modulator, would be to ...
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6 votes
1 answer
3k views

VGA Decoding - Dealing with tolerances

Update: The VGA Simulator is up and running. You can go simulate your own designs or just use the example file to see it working. I also wrote a blog post to help anyone get started using it for ...
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6 votes
1 answer
601 views

Video Out through USB (or other means)

For an medium-high speed ADC converter, my FPGA is currently receiving 16-bit samples at 54 MHz over an LVDS interface (4 differential signal lines plus 1 differential clock signal). These are video/...
6 votes
2 answers
9k views

Raspberry Pi stereo camera frame synchronization/genlock (video or still image)

I need to frame synchronize a stereo camera for a computer vision application. The synchronization should the best possible, hopefully on a millisecond level. I would like to get about 10 FPS either ...
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6 votes
1 answer
429 views

Using an inertial measurement unit to compute global motion optical flow of video [closed]

I have a camera rigidly mounted together with an IMU that consists of 2-dof gyroscopes and 3-dof accelerometers. My aim is to compute the global optical flow of the image captured by the camera, in ...
6 votes
1 answer
383 views

Lack of color displaying composite video

I'm attempting to output video from a TMS9118 VDP to a television's composite video port. Right now the result I'm getting is grey scale (whereas the background should be green), and I have no idea ...
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5 votes
3 answers
45k views

Transmitting a video stream through a microcontroller's wifi

I'm working a a project that currently works well but this year we want to expand it by collecting data from it, independent of its current functions. We have set up an iPad App to control an Arduino ...
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5 votes
3 answers
2k views

Sync video with data

When I have a datalogger and I want to sync a video-file to the recording, what would be an easy method? The logger and the camera both have an internal clock, but they may not be set exactly to the ...
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5 votes
5 answers
783 views

MCU + Linux + Video?

How can I create an device running Linux (Android OS) with video output? PS. I don't want to use an existing very sophisticated dev board, I want to create one. Thanks!
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5 votes
1 answer
28k views

What is Front Porch and Back Porch of a video signal in CRT display? [duplicate]

What is a Front Porch used for? What is a Back Porch used for? What does it mean by active video?
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5 votes
2 answers
319 views

Operation without power: Passing analog video

Okay, the title sounds odd, I'll admit. I need my project to work without power. That is, a complete power failure may happen, and no additional power (such as a battery or supercap) is available ...
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5 votes
5 answers
3k views

Video overlay / on screen display architecture

I want to take a NTSC/PAL component video and overlay graphics over it. I am aware of solutions that either use the max7456 overlay chip, or accomplish it with just an AVR but these seem to have ...
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5 votes
3 answers
6k views

VGA signal timing calculation using MCU

I want to generate VGA signal with microcontroller. But I have hard time finding solution online how to generate them in software. For e.g. Usually all online VGA signal generation just explains ...
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5 votes
2 answers
242 views

What is "rabbit ear" in a video-capture context?

I was reading the TVP5158 datasheet, and ran into a register bit that would enable "rabbit ear". What is that?
5 votes
1 answer
680 views

Can the DS1052E be used for reliable NTSC measurement?

I'm in the market for an oscilloscope. I've read that the infamous DS1052E from Rigol is a great beginner scope due to the price/performance. However, I know I have a lot to learn and simply don't ...
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5 votes
1 answer
143 views

Why should crystal switching be avoided?

The MC44144 is a gated phase locked loop intended for video applications that is described in its datasheet as "sensitive to shunt capacitance" and that "crystal switching should be avoided". What ...
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5 votes
1 answer
3k views

Analog Video PCB Layout

What special considerations and/or constraints are typically applied when routing analog video signals on a PCB (e.g. VGA, NTSC, etc). I'm thinking try and keep them routed on a single layer (i.e. at ...
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5 votes
1 answer
7k views

RGBHV (VGA) to YPbPr Converter and Waveforms?

Purely for hobby, I am working on an RGBHV (VGA) to YPbPr (Component) converter circuit for old games consoles modified to output RGBHV on a VGA cable. From the game consoles, the RGB signal is taken ...
4 votes
8 answers
21k views

Why there is 625 lines [ PAL ] in T.V. scanning or odd lines?

I can't get why there are 625 lines in a PAL scanning system. I read R.R.Gulatti's standard book. In that there is a reason like: "Suppose there are x lines in 1 field. Then for two field its 2x....
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4 votes
4 answers
9k views

High definition video on a composite cable

Does anyone know if there exists an electrical/electronic standard for high definition video on a single wire, like composite TV which integrates luma, chroma and sync? I'm still interested in this ...
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4 votes
2 answers
1k views

How much resistance is too much resistance for a video switch?

I'm looking for a device to switch video signals; a video switch. I want to use a dual/triple switch for two purposes, first to switch between two video signals, and secondly to switch the signal ...
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4 votes
1 answer
705 views

Convert from VGA 9 pin to RCA (manually - old machine) [closed]

I'm in a trouble. Can someone help me? I have a very big machine where I had mounted an IBM 5151 monitor by VGA. The VGA cable was connected to the card below (see attachment), by 4 wires. Now the ...
4 votes
1 answer
1k views

What is this obsolete (?) video screw connector called?

Found on the rear of an old (1970s) Sanyo monitor. It's not standard cable/co-ax, it's larger and beefier. It's used here for a composite signal. Thanks for any pointers.
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4 votes
1 answer
2k views

Is there an FPGA based vector graphics card project?

I have been messing around with VGA projects as my latest interest. I have a Xilinx Spartan 3E 250K FPGA, which has just barely too little RAM for a full 640x480 frame buffer. So, I'm looking at ...
  • 3,306
4 votes
1 answer
555 views

AD725ARZ wrong colors

I designed device based on AD725ARZ, datasheet is here. Device is built basing on the reference circuit diagram on page 12. TV is connected to composite output of the circuit. It does not have S-...
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4 votes
2 answers
13k views

Composite/RGB Video from simple hardware

I'm designing a 68000-based VGM player, and I'd like it to output some sort of 'visualization' of the currently playing song to a TV through either RGB or Composite (video encoder probably for that.) ...
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4 votes
2 answers
1k views

Arduino-like Platform With Wireless and Video?

Is there a Arduino-like hardware platform that allows for wireless connectivity (think remote control) and for connection of a webcam (with streaming that wireless video over the wireless connection)? ...
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4 votes
2 answers
296 views

FPGA - synchronise “very close” clock from signal

This is more of a learning question, I can solve the problem but it would be good to know how to do it - can a clock be reconstructed from a signal, and is it easier when the frequency of the clock is ...
4 votes
2 answers
689 views

Can this old portable CRT TV connect to a RPi?

I'm a scrapper and hacker of vintage electronics. I found this wacky old portable TV with a small B&W screen and I really love the look of it. I want to feed it video (or something) from a ...
user avatar
4 votes
1 answer
250 views

C64 composite video out of spec? Upscaler rejects it, but accepts TC-2048

Trying to wrap my head around why a particular CVBS/SVideo to VGA converter I have accepts every composite signal I feed into it, but refuses a C64C CVBS signal (which my 55" Samsung TV doesn't ...
4 votes
3 answers
1k views

Separating the AM and QAM components in PAL signal demodulation

I'm attempting to emulate the modulation and demodulation of a PAL video frame in software, but I'm having trouble understanding how the AM (luma) and QAM (UV) components of the signal are separated ...
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4 votes
1 answer
772 views

Cheapest way to wirelessly transmit video

I'm really big on building RC vehicles. I want to hook up a video camera which can transmit video signals, but don't know what options I have available. My only requirement is that it has to be as ...
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4 votes
1 answer
1k views

Matching a transformer to one in a video balun - Vertical sync is off

I building an interconnect board which will hold one side of the video balun pair (plus power and rs485). The other side will be a commercially available video balun which connects to the camera. ...
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4 votes
2 answers
729 views

How to best "synchronize" image producer/consumer to handle different FPS?

I'm building a system that among other things has an imaging sensor spitting out digital video @ 30 fps and a display system that displays to a monitor @ 60 fps. The system currently utilizes a frame ...
  • 1,128
4 votes
1 answer
8k views

how to convert a Sync-on-green to VGA (seperate sync) signal?

I have a computer (VAXstation 3100/M76), that has a sync-on-green output: red --( green + sync --( blue --( I want to attach that to a standard ...
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