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by ChrisR
Thu Aug 16, 2012 2:17 pm
Forum: Troubleshooting
Topic: Getting a picture out of a Logitech Quickcam 9000 Pro
Replies: 15
Views: 17364

Re: Getting a picture out of a Logitech Quickcam 9000 Pro

Thanks! I've yet to investigate everything you can do with those packages, but having the latest source definitely helps. I have no idea why you're not able to capture a larger image mchr3k, it all seems to work fine for me although I don't have anything else plugged in except a self-powered 500GB HD.
by ChrisR
Sun Jul 15, 2012 1:24 pm
Forum: Troubleshooting
Topic: Getting a picture out of a Logitech Quickcam 9000 Pro
Replies: 15
Views: 17364

Re: Getting a picture out of a Logitech Quickcam 9000 Pro

This might be useful too, I took the source code for videodev.h from the v4l site and fixed it up to compile the v4l2 software I had. It's a bit different to the videodev2.h file that is included with the distros.
videodev.h.tar.bz2
My updated videodev.h based on v4l headers.
(15.46 KiB) Downloaded 202 times
by ChrisR
Sun Jul 15, 2012 1:12 pm
Forum: Troubleshooting
Topic: Getting a picture out of a Logitech Quickcam 9000 Pro
Replies: 15
Views: 17364

Re: Getting a picture out of a Logitech Quickcam 9000 Pro

Taking images using mmap Hi mchr3k, you can't be having the same issue as I saw - uvccapture says it is operating in mmap mode, which is the right thing for these cameras. I note that your camera identifies itself differently than mine, so there may be some driver issue? I can use uvccapture withou...
by ChrisR
Sun Jul 15, 2012 12:38 pm
Forum: Troubleshooting
Topic: Getting a picture out of a Logitech Quickcam 9000 Pro
Replies: 15
Views: 17364

Re: Getting a picture out of a Logitech Quickcam 9000 Pro

Ok, so first things first. The camera needs to be properly set up by your kernel (i.e. the kernel needs to include the drivers etc. either as a module or built-in). I am using an Arch Linux, version 3.1.9-28-ARCH+. If your kernel does not work, you can either add the right bits and rebuild it or upg...
by ChrisR
Sat Jul 14, 2012 7:44 am
Forum: Troubleshooting
Topic: Getting a picture out of a Logitech Quickcam 9000 Pro
Replies: 15
Views: 17364

Re: Getting a picture out of a Logitech Quickcam 9000 Pro

Thanks, but you could please provide a bit more info on what I need to do to get this up and running? I've never compiled anything for Linux before, so I'm a bit lost. I have the same camera and my Pi is up and running headless. Now what? Thanks. Your options are pretty much limitless. What I did w...
by ChrisR
Sun Jul 08, 2012 10:24 am
Forum: Troubleshooting
Topic: Getting a picture out of a Logitech Quickcam 9000 Pro
Replies: 15
Views: 17364

Re: Getting a picture out of a Logitech Quickcam 9000 Pro

This is what I use in my start script:

Code: Select all

v4l2-ctl -c brightness=128
v4l2-ctl -c contrast=40
v4l2-ctl -c saturation=40
mjpg-streamer/uvc-streamer/uvc_stream -r 320x240 -f 5
by ChrisR
Sat Jul 07, 2012 10:21 am
Forum: Troubleshooting
Topic: Getting a picture out of a Logitech Quickcam 9000 Pro
Replies: 15
Views: 17364

Getting a picture out of a Logitech Quickcam 9000 Pro

I thought this might be a useful tale for anyone trying to get a webcam to work with their Pi.. Not having used a webcam with Linux before, I didn't have any idea what kind of command line tools were available to run it - I wanted to capture the stream and send it over the LAN to a browser on anothe...
by ChrisR
Tue Dec 13, 2011 9:13 pm
Forum: General discussion
Topic: Performance
Replies: 35
Views: 10594

Re: Performance

<r>[quote]<B><s>[b]</s>Quote from gladoscc on December 12, 2011, 10:20<e>[/b]</e></B><br/> [quote]<B><s>[b]</s>Quote from jamesh on December 12, 2011, 10:14<e>[/b]</e></B><br/> Whuh? What do you mean? How can you make that assessment from the comment you quote?<br/> <br/> In fact, the GPU in the 701...
by ChrisR
Sun Dec 11, 2011 8:47 pm
Forum: General discussion
Topic: Performance
Replies: 35
Views: 10594

Re: Performance

<r>[quote]<B><s>[b]</s>Quote from jamesh on December 11, 2011, 10:32<e>[/b]</e></B><br/> The Nokia phone uses a Nokia Arm (?) core + a separate Videocore GPU (2763). The Pi has a single Arm core built in the the same die as the Videocore GPU (2835). However, the Pi Arm core is slower than the Nokia ...
by ChrisR
Thu Dec 08, 2011 5:54 pm
Forum: General discussion
Topic: SD card concern.
Replies: 14
Views: 3652

Re: SD card concern.

<r>If your card is large enough and you want it to work for longer, sure. Having a lot of unused blocks will help the internal wear levelling firmware to spread your load out across the card more evenly. The problem is that you won\'t know in advance if you\'ll be extending life from months or years...
by ChrisR
Wed Dec 07, 2011 10:08 am
Forum: Other projects
Topic: Simple OS from scratch
Replies: 27
Views: 8861

Re: Simple OS from scratch

Nice one :) Remember when you turn the MMU on, your existing memory will be inaccessible until you map it in - you can replace the vector table then if you want to keep your bootloader simple :)
by ChrisR
Wed Dec 07, 2011 8:10 am
Forum: Other projects
Topic: Simple OS from scratch
Replies: 27
Views: 8861

Re: Simple OS from scratch

<t>It's pretty simple to get something going, but don't underestimate just how much software is required for what is considered basic functionality nowadays. Writing a kernel is certainly complex, but it tends to be a tiny amount of code compared to everything else.<br/> <br/> As a learning exercise...
by ChrisR
Tue Dec 06, 2011 4:14 pm
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3813
Views: 277547

Re: Introduce yourself!

<r>Hi, I am Chris and I'm a software engineer in Cambridge in the UK. I've been mostly involved in system software development for mobiles since I started my career in the 90s and I'm still hacking.<br/> <br/> My interest in the Pi is as a tool for my kids to play with, but I'm yet to figure out wha...
by ChrisR
Tue Dec 06, 2011 3:47 pm
Forum: General discussion
Topic: SD card concern.
Replies: 14
Views: 3652

Re: SD card concern.

<r>In my experience there is a huge variability in performance of SD Cards even when bought from the same manufacturer at the same time. It\'s kind of pot luck. I\'ve heard that the Pandaboard is quite sensitive to different cards (some just don\'t work), just like most other dev boards, but it\'s a...

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