Questions tagged [video]

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

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1 answer
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What is a circuit I could use to generate valid analog TV signal?

What is the simplest valid analog TV signal and what circuit is required to generate it?
0 votes
1 answer
36 views

HDMI audio pin-out

I have two HDMI outputs, one of them has only video, the other only sound. What I want to do is combine two HDMI cables and get the video and sound at the same time with only one HDMI cable. But I am ...
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24 views

How to send AHD video wirelessly to an Android device (short range ~3m)?

I have an underwater camera (wired to the water surface) which streams AHD digital video to a RG59 connector. I would like be able to stream the video to an Android device. It doesn't have to be a ...
1 vote
1 answer
66 views

Ethernet to RCA [closed]

I'm trying to get a few cameras (RCA) to connect to a multiplexer and then display their feeds on a monitor, but with one of those cameras connected to my computer instead. I ran into a bit of a ...
0 votes
3 answers
111 views

Does VGA (video graphics array) carry an analog-modulated digital video signal?

If VGA (video graphics array) is analog, then how is it compatible with a digital monitor? When I say "digital monitor", I am referring to TFT LCD display monitor. My guess is that maybe it ...
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Video processing pipeline petalinux

I'm trying to build a very simple video processing pipeline using the ZC706 Evaluation Kit. The pipeline includes the following modules: Video Test Pattern Generator TPG --> Video Frame Buffer ...
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1 answer
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Effects of too-frequent serrations in vertical sync pulse on analog horizontal deflection oscillator

Normal analog TV video signal has a vertical sync pulse with serrations to help keeping the horizontal oscillations in sync. Also, as I understand it, in case of an interlaced video, these serrations ...
1 vote
0 answers
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TVP5150 output 0x80,0x10 and input video signal not locked

This is my first question, I hope everything is ok :) I have been struggling with a problem for a while now. I have a PAL camera (from which I barely have any information) connected to a TVP5150AM1 IC ...
0 votes
1 answer
117 views

How to control a 12V relay from variable voltage source of a LED?

I'm new to electronics and need your help. I have retrofitted a Chromecast to my car and have powered it using a cigarette lighter power adapter to USB. Currently the power adapter is hidden and ...
1 vote
2 answers
140 views

Correct order of monitor/display timing

I'm trying to make a video timing generator on an FPGA. I'm finding a difference online in the order this occurs: Here's one version: and here's another: Where this seems inconsistent: If scanning ...
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0 answers
155 views

FPV interfacing with Arduino boards

I have been trying to interface a Run Cam Nano 3 with Arduino Nano to read the video data. There are 3 pins to the camera, a 5V pin, a GND pin and a video pin. I have been trying to analogRead from ...
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152 views

Sync stripper circuit for RGsB to RGBHV converter

Currently, I have a RGsB signal source, ISL59885 sync separator and RGBHV monitor. Green is the same on the input and output connector (meaning, sync-on-green, not the perfect clean green signal). ...
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2 votes
1 answer
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Terminating unused SDI/BNC input

I use the Magewell Eco Capture Quad SDI M.2 (a small form factor quad-channel) capture device which keeps overheating after a few minutes (up to 100 C). I've read that this might be due to cameras not ...
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1 vote
1 answer
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Looking for an explanation of grounding in relation to computers and DVI-HDMI adapters

I recently found that a DVI-HDMI adapter, purchased to connect the micro-HDMI port on my new Raspberry Pi 400 to the DVI port on my monitor, behaves strangely: it works well when connecting to my ATX ...
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-1 votes
1 answer
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Translating 5-wire camera output to composite signal

An existing OEM rearview camera has 5 wires (V+, LVDS+, LVDS-, LIN, ground). Is there a way to translate (hook up) this to a standard composite cable that goes into back of a aftermarket head unit? ...
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1 vote
1 answer
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Macintosh Classic video input

I want to modify or rebuild the video amplifier circuit of the Macintosh Classic so that it accepts 8 bit grayscale input. Original circuit accepts 1 bit 5V P-P video signal. First idea was just to ...
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3 votes
3 answers
627 views

How to determine if a video signal is interlaced

I know what the difference between interlaced and progressive scan is: in progressive video modes, the monitor displays all the lines of a video field sequentially. In interlaced, it displays them on ...
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2 answers
340 views

ICs for PAL Hsync and Vsync

I have taken the circuit above from a “DIY Pong” tutorial. The circuit generates the HSync and VSync for a PAL signal. What are the labels for classification of an IC equivalent of this?
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1 answer
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How effective is the Intel video Frame Buffer core when storing in memory?

The Intel Video and Image Processing (VIP) Suite IP has a Video Frame Buffer (VFB) core, named Frame Buffer II IP Core, that can take streaming images on the Avalon-ST IF and save them into memory ...
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1 answer
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Convert RGB to the composite video / S-video (math)

I used to do it in circuits with CXA1645 or AD725. But this question is not about soldering, it is about math and digital processing. Imagine I am designing the entry-level graphics processor using ...
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2 answers
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Fixing composite video distortion caused by brightness changes

I'm modifying an old CRT to take NTSC composite input (it only accepts RF over coax.) I have got a good signal going in but it has this weird distortion going on. When the image is dark the pixels may ...
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0 answers
155 views

How to convert composite AV signal or RGB to luma (grayscale)?

As the title says- how can you convert composite signal into luma?? As we all know, composite is just what it says, composite video with grayscale and color signal combined and luma is just grayscale. ...
1 vote
1 answer
171 views

Why does NTSC video have separate reference blank and reference black levels, and how does this affect format conversion?

Re-reading the Wikipedia page on the IRE unit I noticed something new to me: reference black in PAL and SECAM is 0 IRE, rather than 7.5 IRE as it is in NTSC. This brings up a whole host of questions, ...
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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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-2 votes
1 answer
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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 ...
2 votes
1 answer
129 views

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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0 votes
2 answers
538 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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1 answer
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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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1 answer
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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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2 answers
92 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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1 answer
232 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 ...
-2 votes
1 answer
51 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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2 answers
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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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2 answers
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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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3 answers
127 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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1 vote
1 answer
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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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0 answers
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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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0 answers
295 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 ...
1 vote
1 answer
192 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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-1 votes
2 answers
128 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 ...
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 ...
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2 answers
61 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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4 votes
1 answer
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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
1 answer
703 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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0 answers
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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. ...
-1 votes
1 answer
262 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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1 answer
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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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1 vote
3 answers
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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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1 answer
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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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