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by tty1
Fri Jun 05, 2020 1:15 pm
Forum: General discussion
Topic: What can reduce USB 3.0 speed? How is it wired up internally?
Replies: 1
Views: 83

What can reduce USB 3.0 speed? How is it wired up internally?

I know that on desktop systems there often are speed limitations that aren't obvious unless you know how all the io is wired up internally. So I was wondering a couple of thing related to the USB 3.0 ports on the Raspberry Pi 4. From what I read the maximum random io read/write speeds that can be re...
by tty1
Fri Jun 05, 2020 8:32 am
Forum: General discussion
Topic: Cheapest way to capture hdmi from a Windows PC?
Replies: 14
Views: 781

Re: Cheapest way to capture hdmi from a Windows PC?

Thank you, that one sounds really interesting! I ordered one as well, let's see if it can do what it claims. (Another way to get your hands on a cheap screen is to buy an old laptop screen or salvage an old/broken laptop. Those can be found for very cheap or even for free if you're lucky. The tricky...
by tty1
Tue Jun 02, 2020 8:03 am
Forum: General discussion
Topic: Cheapest way to capture hdmi from a Windows PC?
Replies: 14
Views: 781

Re: Cheapest way to capture hdmi from a Windows PC?

I was able to get one of these to work on Linux with a [email protected] input. Since the output is over USB 2.0 the bitrate is very low as expected and it's also rather laggy. I'd say it feels like [email protected]. Latency is around 500ms, I would estimate. If you look around you can find them for as cheap as $...
by tty1
Mon May 25, 2020 4:08 pm
Forum: General discussion
Topic: Cheapest way to capture hdmi from a Windows PC?
Replies: 14
Views: 781

Re: Cheapest way to capture hdmi from a Windows PC?

Wow, thanks for sharing, that's a very interesting device. I like how you can change the bitrate, resolution etc.
by tty1
Mon May 25, 2020 12:52 pm
Forum: General discussion
Topic: Cheapest way to capture hdmi from a Windows PC?
Replies: 14
Views: 781

Re: Cheapest way to capture hdmi from a Windows PC?

Well, the whole point was to find something cheap. $USD 349 seems beyond expensive imo. (Although I like the fact that it is fully open source.)
by tty1
Wed May 13, 2020 8:31 am
Forum: General discussion
Topic: Cheapest way to capture hdmi from a Windows PC?
Replies: 14
Views: 781

Re: Cheapest way to capture hdmi from a Windows PC?

The performance of the PC should not see an impact. I just don't care if the capture card rejects every second frame. I just looked up the BlackMagic Intensity Shuttle USB 3.0 and even used it is $150. That is very expensive for a used capture card if you ask me. And Camtasia appears to be screen re...
by tty1
Fri May 08, 2020 8:26 am
Forum: General discussion
Topic: Cheapest way to capture hdmi from a Windows PC?
Replies: 14
Views: 781

Re: Cheapest way to capture hdmi from a Windows PC?

@Imperf3kt Because of performance and reliability reasons.
@thagrol You're right.
by tty1
Thu May 07, 2020 11:59 am
Forum: General discussion
Topic: Cheapest way to capture hdmi from a Windows PC?
Replies: 14
Views: 781

Cheapest way to capture hdmi from a Windows PC?

I know there are cheap modules like the ones discussed in this thread: https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=273214 But they can only capture signals that are [email protected] from what I understand. Or are the modules just outputting at 25hz but the input can be anything :?: So if I run...
by tty1
Thu May 07, 2020 11:30 am
Forum: General discussion
Topic: Difference between HDMI capture modules?
Replies: 4
Views: 194

Re: Difference between HDMI capture modules?

Thanks for the information. Maybe you could calculate it with photoshop or something. I don't know seems like a lot of effort. All I can say for sure is that the connector is less than 30mm in width.
by tty1
Wed May 06, 2020 8:37 am
Forum: General discussion
Topic: Difference between HDMI capture modules?
Replies: 4
Views: 194

Difference between HDMI capture modules?

Other than the size, what is the difference between these two capture modules? https://www.aliexpress.com/item/4000179327062.html big.png https://www.aliexpress.com/item/4000908554639.html small.png Is one better than the other? Do they both have full-size HDMI ports or do they use the same mini HDM...
by tty1
Mon May 14, 2018 12:19 pm
Forum: Troubleshooting
Topic: Raspberry Pi Zero W - Defective WiFi chip
Replies: 10
Views: 1418

Re: Raspberry Pi Zero W - Defective WiFi chip

Well, I don't play around with Raspberry Pis because I have to, but because it's fun for me and I like to learn new things. I'd rather spend hours soldering a Raspberry Pi together in my free time than going to work for an hour. ;) I wasn't able to find a good source for the chip though. I think the...
by tty1
Mon May 14, 2018 9:27 am
Forum: Troubleshooting
Topic: Raspberry Pi Zero W - Defective WiFi chip
Replies: 10
Views: 1418

Re: Raspberry Pi Zero W - Defective WiFi chip

Well, I don't think that I can return it for a replacement because too much time has passed since I bought it.
I have some equipment that might come in handy (a reflow station for instance) and I have some experience with SMD soldering. Is the WiFi chip available for consumers?
by tty1
Mon May 14, 2018 8:29 am
Forum: Troubleshooting
Topic: Raspberry Pi Zero W - Defective WiFi chip
Replies: 10
Views: 1418

Raspberry Pi Zero W - Defective WiFi chip

I have a Raspberry Pi Zero W that apparently has a defective WiFi chip. If I put the SD card in another Pi Zero W (same version), the WiFi works just fine. Bluetooth seems to work though... at least a Bluetooth device is showing up. For the WiFi there is no device showing up. I have tried reinstalli...
by tty1
Sun Apr 29, 2018 1:22 pm
Forum: Troubleshooting
Topic: Camera live stream with Pi Zero W using cvlc throws errors
Replies: 0
Views: 581

Camera live stream with Pi Zero W using cvlc throws errors

I am trying to stream the video taken by the Pi camera live and in HD over the network, but I keep getting errors setting it up. I am using a Raspberry Pi Zero W with a Pi camera that is connected to the flat cable connector thingy. The camera's LED lights up and the device shows up in /dev/video0. ...
by tty1
Tue Mar 20, 2018 9:11 pm
Forum: Linux Kernel
Topic: Can't find `arch/arm/boot/dts/overlays` when building kernel
Replies: 24
Views: 13731

Re: Can't find `arch/arm/boot/dts/overlays` when building kernel

Hey it's me again, I already gave up and concluded that the official build instructions must be incorrect or the kernel sources are broken. I tried to use the non-rt rpi-4.14.y branch and it seems to have booted into the desktop environment, but both mouse and keyboard don't seem to work. Here is wh...
by tty1
Mon Mar 05, 2018 10:05 pm
Forum: Linux Kernel
Topic: Can't find `arch/arm/boot/dts/overlays` when building kernel
Replies: 24
Views: 13731

Re: Can't find `arch/arm/boot/dts/overlays` when building kernel

No, I'm actually building the kernel on an x64 build server inside a debian based docker container. (Well, for the last screenshot I actually ran the docker container on my local x64 Fedora machine so that I could mount the SD card to the container and install everything directly onto it.) So yeah, ...
by tty1
Mon Mar 05, 2018 12:46 pm
Forum: Linux Kernel
Topic: Can't find `arch/arm/boot/dts/overlays` when building kernel
Replies: 24
Views: 13731

Re: Can't find `arch/arm/boot/dts/overlays` when building kernel

First of all, PREEMPT_RT is already enabled by default so we don't need to enable that manually. Yes, I already realized that . :D I tested -rt branch in the case of aarch64 before. I noticed there was a warnning message: Failed to start Load Kernel Modules. in your case. I recommend you can instal...
by tty1
Fri Mar 02, 2018 7:07 pm
Forum: Linux Kernel
Topic: Can't find `arch/arm/boot/dts/overlays` when building kernel
Replies: 24
Views: 13731

Re: Can't find `arch/arm/boot/dts/overlays` when building kernel

I still can't get it to work. Here's the latest kernel image: https://gitlab.com/T-vK/rpi-rt-kernel-build-project/-/jobs/55360707/artifacts/raw/rpi-rt-kernel.tar.gz (as before, the kernel7.img is in the boot folder). This is how I copied it over: export KERNEL=kernel7 sudo cp /run/media/fedora/boot/...
by tty1
Fri Mar 02, 2018 11:39 am
Forum: Linux Kernel
Topic: Can't find `arch/arm/boot/dts/overlays` when building kernel
Replies: 24
Views: 13731

Re: Can't find `arch/arm/boot/dts/overlays` when building kernel

I'm currently building the latest one. When it is done I'll try that one and report how it went. https://gitlab.com/T-vK/rpi-rt-kernel-b ... s/55360707
by tty1
Fri Mar 02, 2018 11:31 am
Forum: Linux Kernel
Topic: Can't find `arch/arm/boot/dts/overlays` when building kernel
Replies: 24
Views: 13731

Re: Can't find `arch/arm/boot/dts/overlays` when building kernel

Oh, I'm really sorry. The file I provided is not actually the latest head anymore. :oops:
by tty1
Fri Mar 02, 2018 10:23 am
Forum: Linux Kernel
Topic: Can't find `arch/arm/boot/dts/overlays` when building kernel
Replies: 24
Views: 13731

Re: Can't find `arch/arm/boot/dts/overlays` when building kernel

The kernel7.img file is inside the boot folder of this tar.gz: https://gitlab.com/T-vK/rpi-rt-kernel-b ... nel.tar.gz
by tty1
Fri Mar 02, 2018 10:15 am
Forum: Linux Kernel
Topic: Can't find `arch/arm/boot/dts/overlays` when building kernel
Replies: 24
Views: 13731

Re: Can't find `arch/arm/boot/dts/overlays` when building kernel

No success so far. As soon as I put the kernel on my Pi, it will fail somewhere in the boot process. So I tried to flash a fresh install of Raspbian, but again the rt-kernel breaks it. I also tried to flash the pre-built kernel that is provided in this guide : http://download.frank-durr.de/kernel-4....
by tty1
Sat Feb 24, 2018 4:27 pm
Forum: General discussion
Topic: Are these cheap USB HDMI capture cards compatible with the Pi?
Replies: 1
Views: 1676

Are these cheap USB HDMI capture cards compatible with the Pi?

I recently found a guide on how to create an ambilight for any TV using a Raspberry Pi, an analogue cinch capture card, an HDMI to cinch converter and an HDMI Y cable. The whole thing was really pricey and I wonder if it wouldn't be way easier and cheaper to just buy one of these $14 no-name USB cap...

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