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by HermannSW
Wed Apr 17, 2019 9:22 pm
Forum: Camera board
Topic: v2 camera can capture 1000fps videos ...
Replies: 25
Views: 5891

Re: v2 camera can capture 1000fps videos ...

Hi, would a black and white capture change anything in resolution, size, fps? I don't know black and white cameras, only monochrome cameras besides the raw Bayer color cameras. This thread is about capturing with raspiraw, and only few cameras connected to CSI-2 interface are supported right now: o...
by HermannSW
Mon Apr 15, 2019 7:56 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 30
Views: 1952

Re: ArduCam OV5647 Camera Board w/ M12 Mount

The four new 10000lm leds did not arrive today. But I thought again on the luxmeter android apps, and the values measured being higher than the maximal values of 34000lux the apps/sensor can handle. But lux is lm per area. So today I just turned the 10000lm led with 200W heatsink and fan and reflect...
by HermannSW
Sun Apr 14, 2019 7:29 pm
Forum: Camera board
Topic: MMAL cropping
Replies: 5
Views: 148

Re: MMAL cropping

I was wrong, only preview window has problems. This command does what you want, generate 720x720 video. And with first roi parameter you can control left/middle/right by 0.0/0.21875/0.4375:

Code: Select all

raspivid -md 6 -roi 0,0,0.5625,1.0 -w 720 -h 720 -n -o tst.h264
by HermannSW
Sun Apr 14, 2019 3:05 pm
Forum: Camera board
Topic: MMAL cropping
Replies: 5
Views: 148

Re: MMAL cropping

If you'd rather give me raspivid command line option it's fine too, I can translate them to MMAL API calls myself. I don't know MMAL, but you say it can be translated between MMAL and raspivid. It seems there is a bug or restriction in raspivid. This command shows 1280x720 view: raspivid -md 6 -roi...
by HermannSW
Fri Apr 12, 2019 10:21 pm
Forum: Camera board
Topic: Camera dropping frames, any advice?
Replies: 9
Views: 176

Re: Camera dropping frames, any advice?

.h264 does not contain timestamp data, please create another video like you did, but with "-pts test.pts" option and provide video as well as matching test.pts -- the timestamps will clarify what is going on. P.S: $ mediainfo test_640_480.h264 General Complete name : test_640_480.h264 Format : AVC F...
by HermannSW
Fri Apr 12, 2019 5:19 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 30
Views: 1952

Re: ArduCam OV5647 Camera Board w/ M12 Mount

It seems that 10000lm led works as it should, but does not deliver double the brightness through same (24°) reflector than 5000lm led. Back home and reinstalled all stuff that I had with me. I tried several light meters I did install on my Android smart phone. Unfortunately even powered with only o...
by HermannSW
Fri Apr 12, 2019 4:00 pm
Forum: Camera board
Topic: Camera dropping frames, any advice?
Replies: 9
Views: 176

Re: Camera dropping frames, any advice?

I've tried using the command you sent over but still seeing dropped frames and artefacts in the video. I did run the command on Pi3B+ with v2 camera: pi@raspberrypi3B:~ $ camver v2 camera found pi@raspberrypi3B:~ $ raspivid --mode 7 -o test.h264 -fps 90 -w 640 -h 480 -t 15000 -pts test.pts pi@raspb...
by HermannSW
Fri Apr 12, 2019 12:30 am
Forum: Camera board
Topic: Camera dropping frames, any advice?
Replies: 9
Views: 176

Re: Camera dropping frames, any advice?

That command records default mode (1) 1920x1080 and the GPU scales to 640x480. Please try 640x480 modes 6 (42.1-60fps) or 7 (60.1-90fps) for v1 camera, or mode 7 (40-200fps) for v2 camera: https://www.raspberrypi.org/documentation/raspbian/applications/camera.md This is a good command to start and i...
by HermannSW
Thu Apr 11, 2019 11:01 am
Forum: Camera board
Topic: raspistill, apply options without restart
Replies: 1
Views: 69

Re: raspistill, apply options without restart

asdman384 wrote:
Wed Apr 10, 2019 9:12 pm
I just want to get an instant shot when I want it.
See "--keypress" and "--signal" options to trigger shot instantly:
https://www.raspberrypi.org/documentati ... /camera.md
by HermannSW
Wed Apr 10, 2019 9:32 pm
Forum: General discussion
Topic: LED without resister
Replies: 10
Views: 252

Re: LED without resister

I once created thread "Directly connect 3.3V 5mW laser diode to Pi Zero GPIO?": https://www.raspberrypi.org/forums/viewtopic.php?t=155133 People said "don't", but I had created youtube video with 8 such laser diodes being driven by Pi Zero without issues: https://www.youtube.com/watch?v=wvuO7WAann0 ...
by HermannSW
Wed Apr 10, 2019 9:16 am
Forum: HATs and other add-ons
Topic: Pi Zero Enc28j60 Network Adapter Module
Replies: 3
Views: 98

Re: Pi Zero Enc28j60 Network Adapter Module

> I bought a ENC28J60 network adapter made for Arduino, it didn't work > I was able to use exactly those cheap Arduino modules with Pi Zero three years ago, see the instruction links: https://www.raspberrypi.org/forums/viewtopic.php?t=152965#p1015300 https://stamm-wilbrandt.de/en/forum/IMG_20160726_...
by HermannSW
Tue Apr 09, 2019 8:00 pm
Forum: Camera board
Topic: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)
Replies: 19
Views: 1662

Re: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)

Off topic a bit. A colleague saw that I do solder IC logic circuits, the one from previous posting and the one from other thread: https://stamm-wilbrandt.de/en/forum/IMG_010419_173444.jpg He gifted me his 34yo diploma thesis ISDN ISA card for IBM PC to make use of the many 74xxx ICs in IC sockets. H...
by HermannSW
Mon Apr 08, 2019 8:53 am
Forum: HATs and other add-ons
Topic: Test Point Locations
Replies: 8
Views: 286

Re: Test Point Locations

I'm only particularly interested in the 3B+ but a list of all PP test points, their uses, and locations on various hardware revisions would be helpful to the community imho. This is a good PP list for Pi Zero: https://www.raspberrypi.org/forums/viewtopic.php?t=175504 For Pi 2B the schematics have 1...
by HermannSW
Sun Apr 07, 2019 6:34 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 30
Views: 1952

Re: ArduCam OV5647 Camera Board w/ M12 Mount

I did upgrade from 5000lm led to 10000lm led. As described in other thread running 10000lm without cooling even for few seconds is dangerous. So I use the 100W 10000lm led only glued on big 200W heatsink with 12V fan. In order to have the reflector just in the place needed I built a Lego mount for l...
by HermannSW
Sat Apr 06, 2019 9:25 am
Forum: Camera board
Topic: Camera v2: Accurate High-Speed Frame Rate Output
Replies: 10
Views: 464

Re: Camera v2: Accurate High-Speed Frame Rate Output

Hi, buffer->pts is the timestamp, but I don't know whether the GPU adds it (I assume so since the camera might not have a clock). buffer gets passed to the callback static void encoder_buffer_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer) and that callback is set by a MMAL function which ...
by HermannSW
Fri Apr 05, 2019 6:55 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 30
Views: 1952

Re: ArduCam OV5647 Camera Board w/ M12 Mount

I did experiment with "shutter delay==exposure" very low values. In this setup FREX goes HIGH together with STROBE: https://stamm-wilbrandt.de/en/forum/gs.mt.11us.br75.23us.png I did go down to 23µs only and expected to see much darker frames because of the time the 5000lm led needs to get full brig...
by HermannSW
Fri Apr 05, 2019 1:15 pm
Forum: Camera board
Topic: Camera v2: Accurate High-Speed Frame Rate Output
Replies: 10
Views: 464

Re: Camera v2: Accurate High-Speed Frame Rate Output

Does the latency affect the timestamps for each frame? I am more concerned with the validity of the timestamps rather than which frames are actually dropped/missing. Not really, here is the code in raspivid that saves the buffer and the timestamp if "-pts" option was used: https://github.com/6by9/u...
by HermannSW
Thu Apr 04, 2019 8:37 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 30
Views: 1952

Re: ArduCam OV5647 Camera Board w/ M12 Mount

In thread "Mouse trap: from 0 to 72km/h in 8ms(!)" https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=234406&p=1433883#p1433883 I used high framerate video capturing to get 10 frames of closing mouse trap bar in moving phase, which is 0.01s in total. While that thread was on video taken from ab...
by HermannSW
Wed Apr 03, 2019 7:00 pm
Forum: Camera board
Topic: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)
Replies: 19
Views: 1662

Re: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)

In order to have less of cable clutter and more recoverability for generation of precision pulses of a length 1.1×R×C seconds I did solder a small logic circuit, with female headers for easily switching R and C for different pulse lengths, and with 2 male headers for GND/TRIG/OUT/VCC (the constant 1...
by HermannSW
Tue Apr 02, 2019 11:30 pm
Forum: Camera board
Topic: How to make pi camera display stays in front of other windows
Replies: 2
Views: 212

Re: How to make pi camera display stays in front of other windows

Heersh wrote:
Tue Apr 02, 2019 8:47 pm
....and it covers all the screen. ... Even if I click on another window, ...
How can that happen?
by HermannSW
Tue Apr 02, 2019 7:33 pm
Forum: Camera board
Topic: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)
Replies: 19
Views: 1662

Re: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)

The mini breadboard I used had problems, after moving the complete circuit onto a real breadboard the measured values make sense. This is logic analyzer for R=4.67KΩ and C=10nF: https://stamm-wilbrandt.de/en/forum/pulse.55.1us.png 1.1×R×C = 0.00005137s = 51.37µs, sufficiently close to the measured 5...
by HermannSW
Tue Apr 02, 2019 5:47 pm
Forum: Camera board
Topic: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)
Replies: 19
Views: 1662

Re: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)

I manged to setup the logic circuit as shown, but measured strange data. These are minimal, maximal and their difference for C=1000µF and R=100Ω. This does not match the t=1.1*R*C, is nearly 10 times less the 0.11s: 0.017187963 0.018180375 0.000992412 Similar for C=100µF and R=100Ω : 0.001310350 0.0...
by HermannSW
Mon Apr 01, 2019 9:37 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 30
Views: 1952

Re: ArduCam OV5647 Camera Board w/ M12 Mount

Last video effective exposure was 10.88µs+140ns+2.4µs=13.42µs. I wanted to try half of effective exposure time, 6.71µs-2.4µs-140ns is slightly more than 4µs strobe pulse length. So I configured 4µs strobe pulse length (00 16 in registers 3b0[bc]). The frames looked really washed out. I did try brigh...
by HermannSW
Mon Apr 01, 2019 6:46 pm
Forum: Camera board
Topic: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)
Replies: 19
Views: 1662

Re: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)

After successful 2MP global shutter videos with Arducam ov5647 camera, I have bought ingredients for allowing a big range of pulse lengths for the monostable circuit: 1/10/100 pF/nF/µF and 1000µF capacitors 20Ω/30Ω/40Ω/50Ω/60Ω/70Ω/80Ω/90Ω/100Ω resistors Pulse length of mono stable circuit is 1.1×R×C...

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