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by topguy
Wed Oct 05, 2022 10:21 am
Forum: Beginners
Topic: Using a raspberry pi as an external monitor
Replies: 8
Views: 274

Re: Using a raspberry pi as an external monitor

But what kind of machine is it going to be an external monitor to ? Does that machine have its own display ? Do you want the "external monitor" to show a copy of what is showing on the other screen or behave as an extended desktop. Not many systems I know that would support such a thing ( ...
by topguy
Wed Oct 05, 2022 10:11 am
Forum: Beginners
Topic: Stuck in Recalbox
Replies: 1
Views: 61

Re: Stuck in Recalbox

Why would there be a Chromium desktop on your Pi ?
I dont remember there being a chromium desktop as part of RecalBox.. but its been a while since I tested it..
You change the SD card to change the OS.
by topguy
Wed Sep 28, 2022 8:51 am
Forum: Advanced users
Topic: Make system image on another device
Replies: 10
Views: 435

Re: Make system image on another device

In my opinion "dd" is still usable for your scenario, but you will have to wait for the copy of the whole 64GB regardless of how much data is in the partition. You have the option to shrink the partition on the "from" stick before dd'ing just enough data ( using "bs" an...
by topguy
Mon Sep 19, 2022 12:31 pm
Forum: Troubleshooting
Topic: Shutdows Raspberry Pi when USB Flash Drive is Inserted
Replies: 2
Views: 229

Re: Shutdows Raspberry Pi when USB Flash Drive is Inserted

I gave it the name "shutdown". What exactly do you mean by "gave it the name" ? Did you label the filesystem on the drive ? Anything on the driver is not part of the USB information available to udev. To list USB information you use "lsusb -v" example using a random me...
by topguy
Wed Sep 14, 2022 10:04 am
Forum: Networking and servers
Topic: Adding custom cable network adapter
Replies: 1
Views: 366

Re: Adding custom cable network adapter

This is a very old guide, but maybe it still works or can give you hints about what to google....

https://stackoverflow.com/questions/442 ... vice-match
by topguy
Mon Sep 05, 2022 9:30 am
Forum: Troubleshooting
Topic: Desktop oversized on CRT TV
Replies: 10
Views: 352

Re: Desktop oversized on CRT TV

The concept of "overscan" comes from CRT displays and how much overscan it has varies a *lot*. Some TVs had service menus where you could manipulate this. Have you tested uncommenting these lines: #overscan_left=16 #overscan_right=16 #overscan_top=16 #overscan_bottom=16 I would consider en...
by topguy
Thu Sep 01, 2022 10:13 am
Forum: Graphics, sound and multimedia
Topic: building Blender 2.79 / install
Replies: 1
Views: 279

Re: building Blender 2.79 / install

Which model of Pi is your Pi ?
Are your OS up to date ?

There is no ARM/Linux build of blender in that link you posted.

An earlier thread:
viewtopic.php?t=290509

I would suggest trying the standard install first:

Code: Select all

sudo apt install blender
by topguy
Tue Aug 23, 2022 2:16 pm
Forum: Beginners
Topic: How to add icon in GUI on Raspbian OS
Replies: 3
Views: 120

Re: How to add icon in GUI on Raspbian OS

Do you mean:
How to set the icon of application on the start-bar at the bottom ?
or
How to set the icon of a shortcut on the desktop that you click to start the application ?
by topguy
Tue Aug 23, 2022 9:36 am
Forum: Graphics, sound and multimedia
Topic: ALSA warnings / errors with PyAudio script
Replies: 1
Views: 186

Re: ALSA warnings / errors with PyAudio script

In general Linux audio is a mess.. There are usually multiple sound APIs to choose from but not all of them might be configured correctly.. I can see pyAudio going trough "ALSA", "PulseAudio" and "Jack" looking for some audio hardware and that is what is causing all the...
by topguy
Thu Aug 18, 2022 9:38 am
Forum: Camera board
Topic: error trying to stream libcamera
Replies: 4
Views: 437

Re: error trying to stream libcamera

Can you provide a link to the guide you are following ? libcamera-vid: symbol lookup error: /lib/arm-linux-gnueabihf/libcamera_app.so: undefined symbol: _ZNK9libcamera11ControlList8containsERKNS_9ControlIdE Does the application exit after printing this error ? Its weird if you have a mismatch betwee...
by topguy
Thu Aug 18, 2022 9:17 am
Forum: Troubleshooting
Topic: vlc/cvlc on bullseye doesn't display JPG files
Replies: 4
Views: 216

Re: vlc/cvlc on bullseye doesn't display JPG files

Meanwhile I found out: Older photos in JPG format have no problems. They are displayed as expected. It is probably due to the resolution. My old photos have a resolution of 2.4 mega pixels, the new ones of 20 mega pixels. Is there anything I can do to the Raspi's settings to cope with the higher re...
by topguy
Wed Aug 17, 2022 11:11 am
Forum: SDK
Topic: Improve Serial USB Speed
Replies: 4
Views: 699

Re: Improve Serial USB Speed

Is there an alternative to printf in C?
write()
by topguy
Mon Aug 15, 2022 10:01 am
Forum: Graphics, sound and multimedia
Topic: Post Photos to HTML with PI Webcam
Replies: 3
Views: 225

Re: Post Photos to HTML with PI Webcam

HTML/CSS/Javascript all run on the client side. Grabbing the picture from the camera needs to happen on the server side so you need code that runs there. There are commonly two methods for that, CGI and PHP. ( https://httpd.apache.org/docs/2.4/howto/cgi.html ) CGI programs/scripts can be written in ...
by topguy
Tue Jul 19, 2022 1:22 pm
Forum: Graphics, sound and multimedia
Topic: Frame rate question (blurry image)
Replies: 6
Views: 437

Re: Frame rate question (blurry image)

If the camera has a 1/30s shutter speed and screen refresh is 60fps and game is running > 60fps the camera will be exposed to *two* frames.

But maybe the screen just has really bad LCD refresh times ( I mean it says LG ;-) ), is it a Monitor or really a TV ?
by topguy
Mon Jul 18, 2022 5:27 pm
Forum: Graphics, sound and multimedia
Topic: Frame rate question (blurry image)
Replies: 6
Views: 437

Re: Frame rate question (blurry image)

Having FPS higher than screen refresh rate should normally give tearing and not ghosting..
may be worth checking what resolution and refreshrate Ubuntu thinks your screen have..

Test on different display.
by topguy
Mon Jul 18, 2022 2:20 pm
Forum: Troubleshooting
Topic: GPG error
Replies: 1
Views: 145

Re: GPG error

None of those sources are official ones, they have been manually added to your system... Also "jessie" ( Debian 8 ) was originally released in 2015 and is getting pretty old.. support might be dropped.. You can just remove those entries from the registered apt-sources and the errors should...
by topguy
Mon Jul 18, 2022 2:08 pm
Forum: Troubleshooting
Topic: Error "Unable to detect a usable serial port"
Replies: 1
Views: 121

Re: Error "Unable to detect a usable serial port"

- test with a powered and maybe also an unpowered USB hub..
- buy a new modem..
by topguy
Mon Jul 11, 2022 12:55 pm
Forum: Other programming languages
Topic: Raspberrypi connect to Meta Quest 2 using Bluetooth
Replies: 4
Views: 551

Re: Raspberrypi connect to Meta Quest 2 using Bluetooth

I have already succeeded in connecting Rasberrypi to Quest 2.
Which protocol/profile did you use for this connection. ( https://en.wikipedia.org/wiki/List_of_B ... h_profiles )
The serial-port profile seems very suitable for sending custom data..
by topguy
Fri Jul 08, 2022 1:15 pm
Forum: Other programming languages
Topic: Raspberrypi connect to Meta Quest 2 using Bluetooth
Replies: 4
Views: 551

Re: Raspberrypi connect to Meta Quest 2 using Bluetooth

The Meta Quest is basically an Android device. It supports BT keyboard/mouse in system, but I have never tried to pair some random BT device. But its quite possible you can do this connection inside your application. Some example library for Pi to Android Phone BT communication. https://bluedot.read...
by topguy
Mon Jun 13, 2022 12:02 pm
Forum: General discussion
Topic: How to download software on a USB-Drive
Replies: 3
Views: 244

Re: How to download software on a USB-Drive

Most applications on linux can be placed anywhere and run from anywhere. But how easy it is, very much depends on the application itself. - The software may f.ex need specific libraries to exist either on the system-drive or placed on the USB drive ( and then you have to tell the software where to l...
by topguy
Fri May 27, 2022 12:55 pm
Forum: Camera board
Topic: Live Camera Feed On RPI Desktop
Replies: 4
Views: 503

Re: Live Camera Feed On RPI Desktop

"cvlc" is a commandline version of VLC which you can easily use from a script if you choose to.
by topguy
Tue May 24, 2022 9:53 am
Forum: Troubleshooting
Topic: Raspberry Pi Zero 2 W, GPU drivers
Replies: 2
Views: 179

Re: Raspberry Pi Zero 2 W, GPU drivers

I was wondering if maybe the issue is the choice of graphics driver?
I am assuming you are using the HDMI output ?
Which OS have you installed ?

I think you don't really have any choices in drivers.. and that your other thread, is the one to focus on.

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