Questions tagged [video]

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

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37 views

Isolation Transformer for DVI application

I have added DVI on my circuit. I need to isolation solution for DVI line on PCB side. Do you know any isolation transformer using for DVI application?
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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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Digital to analog in an old 35mm film recorder [closed]

I'm looking at an old film recorder from 1985, the Polaroid Freeze Frame, the back of the machine pictured here: From here: https://www.radiomuseum.org/r/polaroidco_freezeframe_video_recorder.html I ...
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TMDS Chip fails but Direct Connection to FPGA works

We've been attempting to do some graphics over HDMI using an FPGA. I've built a board that has two HDMI connections. One of these links the required video lines directly to the FPGA. The second HDMI ...
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2answers
130 views

Output composite video (PAL) signal from FPGA DAC, totally lost in the analog domain

I'd like to start generating (and perhaps also capturing) composite video (PAL) signals from a digital source, eg. FPGA. However, while my digital logic/programming skills are covered, I'm lacking a ...
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31 views

IC with SDCard and LVDS interfaces for video playback, what are they called?

I am looking to build a board that can connect to an LVDS LCD screen and play back videos from an SD card when triggered via a serial port command, or I2C, or similar. I have seen cards like that on ...
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82 views

Is the peak to peak amplitude of a NTSC composite signal always the same?

I am currently trying to learn more about video signals. I'm particularly interested in NTSC since I live in North America. I recently bought an oscilloscope (Siglent SDS1104X-E) and I am trying to ...
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2answers
68 views

PAL Video - Horizontal Color Pixels

I've created an 8-bit VGA controller that outputs a 400x300 RGB signal. I also want to implement an AV output using PAL encoding. I don't understand how I can achieve the same resolution since the ...
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61 views

2 Composite signals into one display

I want to install front and rear cameras on my car. However, the head unit only allows one composite in. The circuit I am thinking of is below. I think the power side of the circuit is OK, but to keep ...
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Routing multiple video and power through one multicore cable

I currently have three cctv camera feeds each with a dedicated cable, I assume a 4 or 3 core of some layout (not sure if this is shielded or otherwise). Currently each cable has a dc pair end ...
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1answer
48 views

what is the relationship between horizontal frequency and CPU power? [closed]

I'm building a device that will read video input, encode it and save it to disk. I read about horizontal frequency as a measure for video capacity, in khz. is that the same hz as in CPU power? what is ...
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2answers
88 views

What wires are optional in HDMI?

The 2009 Hyundai Genesis has a combo CD player / stereo / Navigation / car information system. It has an LCD panel that displays information from this system but I'd like to get it working with a ...
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57 views

Why do we use FIFOs and RAM in an image processing scheme?

I found a cool project (https://www.youtube.com/watch?v=aGCcT7p0-wY&lc=) which I want to replicate. This is the flow: Analog camera -> ADV7180 (it converts the video from NTSC or PAL to 8-bit ...
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3answers
83 views

Purpose of resistor to ground in video-amp circuit

I was watching how to make a nintoaster, that is, an NES (Nintendo Entertainment System) in the form of a toaster. The video is here. One of the things he does in the video is building a video-amp ...
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1answer
85 views

Looking for ideas: An easy way to automatically press a key at computer restart

I'm looking to make a restart solution for a computer that doesn't necessitate manual input. I have a server with a BIOS that, when every slot of memory is full, automatically downgrades the speed of ...
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42 views

Does it take more power (battery-life) to stream video or to do local video processing?

I have a raspberry pi with a camera. I want to take analytics from the video (mostly object detection). This doesn't have to be run in real time and the RPI doesn't need the output of the video ...
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Where to start designing a ~1Hz to ~60Hz square wave oscillator as a switch for a Klomp dirty video mixer?

So I built this circuit and in messing around with it I found if I switched quickly between a camera (feedback) source and a video source in quick succession with the switch I obtained an ...
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161 views

How to simulate a composite video input signal in ltspice

I want to simulate this video driver circuit (i think it's called that) in ltspice I found this design from this very nice video: https://www.youtube.com/watch?v=lqSiMKwfZsY by the videolabguy. To ...
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1answer
99 views

How to make a HDMI signal be identified as HDMI instead of DVI?

I am experimenting with the HDMI port of an ULX3S FPGA board. I have been able to properly generate DVI signals with a resolution of 800x600 and framerate of 60 Hz. I am now trying generate actual ...
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2answers
83 views

How do USB cameras encode video streams to be sent over USB? [closed]

Generic USB cameras can be used plug-and-play without the need for any additional drivers. How is the video stream compressed and sent over a USB connection? What are the standardized drivers that ...
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2answers
124 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 ...
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57 views

Can an HDMI input marked "ARC" be used for ordinary video? [closed]

If a television has one of its HDMI inputs marked "ARC" can I use that input for regular video input?
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1answer
166 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 ...
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1answer
559 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 ...
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How can a ground loop cause a OSD to flicker / dissapear without affecting the rest of the video?

I don't know if it is best to ask this question here, or on drones.stackexchange.com, but I think that I am more likely to get a good answer here even if i might have to provide a bit more background. ...
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30 views

Switch video sync signal using transistor

I have a circuit that currently outputs either a high or low signal from a pin on a PIC microcontroller. This part is working as expected. I now want to take that high / low signal and use it to ...
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1answer
76 views

What is Level A and Level B in 3G SDI Interface

Can someone point me at a description of the difference between a 3G-Level A SDI signal and a 3G-Level B SDI signal.
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55 views

Diagram/PCB functionality explained

I have a diagram that I've recreated from a PCB by studying it's trace routing and what components are in use. Limited to what was listed on the components themselves, I believe I have gotten most of ...
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1answer
187 views

Analog video chrominance decoding - PAL/NTSC

I'm implementing an analog video decoder on FPGA. I find some difficulties during chrominance decoding. I appreciate if you can help me. These are the steps as I'm doing: I generate an NTSC ColorBar ...
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3answers
63 views

Use SFP modules for HDMI or Dp TMDS line

I just wonder if it's possibile to take four SFP modules and connect them dirrectly to TMDS lines of HDMI output and send such signal via four fiber to other similar end? Is it doable?
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82 views

Composite video from rear car camera - bad signal (wrong levels?)

I have bought a car radio (AMPrime 4022D) that has ability to connect rear camera to it, so you can see the image on its screen. The problem is that radio doesn't detect the signal (blue screen). But ...
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2answers
293 views

8 bit PC integrated with VGA video card (similar to ben eater project)

I'm thinking about making a project like this one and add a graphics card like that one. Using an EEPROM for the video memory and changing its content setting it in write mode and assigning a value ...
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3answers
278 views

Merging two different HDMI cables

I have two brands of broken HDMI cables that I need to join to make them longer. Can't join them by color, because they are completely different. Plus, one of the cables has all the wires, the other ...
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1answer
47 views

HDMI Video to RCA Audio [closed]

Some 20 years ago I created an audiovisual art installation, connecting RCA Video output from a TV set to a HiFi system's audio-in, just plain via cable, in order to "hear" the video signal. ...
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1answer
84 views

Texas Instruments fully differential op amp app note: I'm having difficulty understanding an equation (single ended to differential video conversion)

I am developing a circuit to convert single-ended video to differential, based around the TI article "Converting single-ended video to differential video in single-supply systems" by Jim ...
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1answer
254 views

Difference between LVDS SerDes and FPD-Link III SerDes?

I'm new to the world of video interfaces and am working on a project in which parallelized video stream data is transmitted and subsequently received by processing components on the other end of an ...
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30 views

How can I gate the output of this phase detector?

I want to make a PLL which will lock to the subcarrier of a composite video signal during colourburst. The colourburst is present for about 2.25uS of each scanline which is 64uS long. So during that 2....
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1answer
200 views

Connect an I2C camera to computer via USB as a webcam

I took out of an old security camera its circuitry and I am trying to figure out a way to connect it via USB to my computer and use it as a standard webcam. Is it possible? Here are the front and the ...
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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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1answer
208 views

Are the Front- and Back-Porches Required to be Black for VGA?

My first question for this project was how to process a fast analog signal in the first place: Digitally-Controlled Analog Processing for VGA Video Signal? This one is about a specific detail of that ...
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3answers
190 views

Will an RF modulator provide NTSC System M spec video from a DVD player?

I've been attempting to recreate the effect of an old NTSC television broadcast lately with the use of DVDs. The DVD-Video spec allows for up to 720 x 480 pixels at a display rate of 29.97 frames per ...
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2answers
565 views

How can I build a composite video to scart converter?

I'm interested in building a composite to scart adapter. How can I?
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1answer
456 views

VGA to Composite conversion cable

I'm not able to obtain an adapter from local markets for vga to composite video output. Found a circuit [VGA to composite circuit. Does it work?] that claims to work. I didn't had a vga cable so I ...
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1answer
120 views

Digitally-Controlled Analog Processing for VGA Video Signal?

A few months ago, I replaced the dead fluorescent backlight of an LCD computer monitor with an 8-bit-per-channel RGB LED strip, and built a controller for it from an AVR microcontroller that talks to ...
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46 views

Can anyone help me find a connector for this?

I'm having trouble identifying this connector https://imgur.com/gallery/6M3bkJJ I'm trying to find the connector to it so I can connect the 5 wires for video. This board is part of a arcade machine.
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1k views

DIY Webcam (MIPI to USB)

I'm looking to purchase a webcam (or several) for live streaming since I'm stuck in my house for the indefinite future because of the coronavirus. However anything halfway decent is completely sold ...
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115 views

Best wire gauge for an RGB video signal

I'm trying to wire a CVBS-to-RGB converter into my car's monitor that only supports Navigation Maps with an old-fashioned ...
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1answer
512 views

Explain how this CCTV video balun actually works?

I am trying to reverse engineer this video balun. It is meant to convert a 100~120 balanced video signal on twisted pair to a 75ohm unbalanced signal. I've removed it from it's housing, but normally ...
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1answer
80 views

Is it possible for an HDMI cable to be "worn in"?

I have an HDMI cable running thirty feet between my computer and a TV. I've had various problems with the screen flashing, stuttering, etcetera, due to the signal not being strong enough to carry a 4K ...
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1answer
134 views

Replacement NTSC colorburst crystal won't oscillate

First of all, an honest warning - I am a brave (and stubborn) idiot, and a self-taught idiot to boot. I know my way around the basics and have repaired some non-trivial circuits (various complex acid-...

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