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Raspberry Pi 4

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Re: Raspberry Pi 4

#841

Post by rglullis »

ghalfacree wrote: post #839
rglullis wrote: post #838

Earlier quoted context omitted.

I used to have about ~$15/month deposited on flattr* for quite some time, and the main reason that I've been using brave is not because of its anti- ad stance but rather their anti- tracking + the possibility of a way to fund content creators. I am also contributing about ~10€/month on patreon for different software projects and writers. I've written to more than one youtube channel producers asking them to look into…

The problem with Patreon - and thus Quilette, which is 95 percent funded by Patreon - is that there's a massive gulf you can't cross. Popular Content Creator who has a hojillion Patreon backers and gets $10,000 a month from 'em has no worries; person who plays about with it in their spare time and gets $5 a month can buy a beer. Job's a good 'un. But what about the person who wants to write full time, but hasn't buil…

I am sorry but this is the point where we disagree. "I still need to make a living" is not that I would accept as an argument to justify all of the unethical issues that arise from the attention economy industry.

Yes, this means that I will actively find ways to accelerate the demise of these business. No matter how much I want to support content creators, it does not make me responsible in guaranteeing their job.

Re: Raspberry Pi 4

#842

Post by jyrkesh »

bscphil wrote: post #785
supergauntlet wrote: post #698

Earlier quoted context omitted.

I haven't actually seen a single 1080p raw bluray file with a higher video bitrate than 35 Mbps. Maybe with TrueHD/Atmos audio the total bitrate could push past 40, but 100 Mbps is way more than you need for 1080p. Even 4k doesn't seem to push past 50 Mbps, but I think that's because h.265/HEVC is more efficient for the same observed quality/CRF.

You are right. I don't know what your parent comment is talking about. Blu-rays use H.264 High Level 4.1. That has a maximum bitrate (for a single buffer) of 50 Mbps. The average bitrate for an entire disc is usually closer to 25-30. Even the most extreme cases, like the mastered-in-4K Lawrence of Arabia, have peaks at about 48 Mbps, and average bitrates of about 42 Mbps. If you're having issues streaming Blurays on…

> If you're having issues streaming Blurays on a 100 Mbps network, the speed of the network is not your problem!

Well, it COULD be the problem if you're not actually getting the 100 Mbps. I've diagnosed WiFi that should have a lot more headroom than 100 Mbps but still stutters on mid-bitrate 1080p. Signal degradation

Re: Raspberry Pi 4

#843

Post by m463 »

levesque wrote: post #817
m463 wrote: post #768

Earlier quoted context omitted.

I like the usb-c input. The big shortcoming of the other Raspberry Pis I have is power. Plug anything into it and you risk undervoltage problems (even with the official supply) [ 49.910905] Under-voltage detected! (0x00050000) [ 76.949928] Voltage normalised (0x00000000) [ 436.806032] rpi_firmware_get_throttled: 1 callbacks suppressed [ 436.806038] Voltage normalised (0x00000000) [ 438.886093] rpi_firmware_get_thrott…

An alternative would have been a powered USB hub.

I have one system where I relented and did that, but really, for many generations of pi... why is this even a thing?

For example, recently I plugged in a USB stick and a webcam and couldn't boot. So I would boot, then then plug in the webcam ... carefully. And there were still 2 usb ports free.

Re: Raspberry Pi 4

#844

Post by myrandomcomment »

marcosdumay wrote: post #840
bscphil wrote: post #785

Earlier quoted context omitted.

You are right. I don't know what your parent comment is talking about. Blu-rays use H.264 High Level 4.1. That has a maximum bitrate (for a single buffer) of 50 Mbps. The average bitrate for an entire disc is usually closer to 25-30. Even the most extreme cases, like the mastered-in-4K Lawrence of Arabia, have peaks at about 48 Mbps, and average bitrates of about 42 Mbps. If you're having issues streaming Blurays on…

NFS can not use the entire raw bandwidth for application data, and it is very likely that mplayer compresses its filesystem calls instead of making a perfectly spaced stream of them. Also, Ethernet does simply stops working way before 100% of the bandwidth is used. I don't know why you expect things to run smoothly at 50% utilization.

NFS is not the most effect protocol however NFS3 over UDP should be able to hit 75% liberate on that 100M link easy. Something else is the bottle neck here. I have done a great deal of testing on this on 100M all the way to 100G links in my career and properly tuned you should be able to hit 80% or so or the link speed at real data through put.

Re: Raspberry Pi 4

#845

Post by znpy »

ghalfacree wrote: post #798
znpy wrote: post #572

Earlier quoted context omitted.

I can't read that article because Medium has decided that I have to login to do so (and possibly sign up). Needless to say, I won't be reading that link. Wordpress.com wouldn't have done that with your content. Just saying.

Hi, author of the piece here! You're right that WordPress wouldn't have given you a popup before you could read, for free, the article I spent a couple of months working on. It also wouldn't have provided me with any income to support creating the article in the first place. Medium, on the other hand, does. I mean, it's not much - I get a slice of the revenue from paying subscribers', based on how much they 'applaud'…

I wouldn’t know. It’s not like I’ve consumed my “fair free share” of your content, I’ve apparently consumed my fair free share of content across all of medium.

Would you accept to be requested documents when you enter the mall? Would you find normal to be stopped by a security guard that says “sir/madame, you’ve browsed enough stores for free without handing in your id card and personal data, please fill this form or leave” ?

I owe you nothing. If anything, you owe me. It’s my time that builds your audience, not the other way around.

Re: Raspberry Pi 4

#846

Post by HankB99 »

dheera wrote: post #760
jacquesm wrote: post #740

Earlier quoted context omitted.

Comparing one item at list with another on sale is a bit of an apples-to-oranges comparison.

Not really, what matters to me is the price I can get them at, including shipping, including taxes, including shenanigan fees, including sales, including discount codes, including 5% cashback on Amazon, including 1% cashback on other sites. RPis pretty much never go on sale.

If you have a Microcenter near you, they often have 'in store only' sales. Right now a Zero W (limit 1) is $5 and a 3B+ is $25. Right now they list the 4GB 4B due in on the 28th for $55. (All $ in US.)

Re: Raspberry Pi 4

#847

Post by megous »

rbanffy wrote: post #588
megous wrote: post #516

Earlier quoted context omitted.

That's great, but if you need crypto (because you have LUKS storage and send AES encrypted data over the network, like in a usual NAS case), A53 with aes instructions may be faster than this A72 without one. And so far it seems these cores don't have aes instructions.

I would never expect (or demand) a cluster designed for educational purposes out of sub $100 nodes to be fast. In fact, being slow can be considered a feature in this scenario.

Yet, you can have the same priced board that can do 200-800MB/s AES-128 encryption (per core), leaving much more time to the actual useful work, or idle (less power consumption).

https://github.com/ThomasKaiser/sbc-bench/blob/master/Result...

See PineH64 for example.

Re: Raspberry Pi 4

#848

Post by megous »

fulafel wrote: post #537
megous wrote: post #516

Earlier quoted context omitted.

That's great, but if you need crypto (because you have LUKS storage and send AES encrypted data over the network, like in a usual NAS case), A53 with aes instructions may be faster than this A72 without one. And so far it seems these cores don't have aes instructions.

Maybe. It has a lot of CPU power relative to IO bandwidth, it should do ok in pure software. Hmm, anyone know if the VideoCore VI would be any good for crypto?

Depends on your use case. If you have SSD attached over USB3, you can easilly pull 400MB/s. This would severely limit that, if that is an encrypted drive. On Allwinner H6, for example, you could get that speed on oncrypted drive while still having other cores free for other stuff.

So if you need to go through/process gigabytes of data on encrypted drive, having to do encryption in SW will slow you down massively, especially if you also need to process the retrieved data somehow.

Re: Raspberry Pi 4

#849

Post by craftkiller »

Someone1234 wrote: post #545
driverdan wrote: post #521

Earlier quoted context omitted.

Why? What do you use composite video for? I think the last time I used composite video for anything was 10+ years ago.

It is analog video. Meaning you can read the result without needing a HDMI decoder. It also has much long range than HDMI (150 feet is cited compared with 50 feet for HDMI). You can also use boost extenders to transmit the feed over almost unlimited distances for little additional cost. It is less useful at home, and more useful in industry, scientific, and experimental applications.

Wouldn't it be better to just need run Ethernet instead? You could use the PoE hat to get both power and digital data over a single cable 300 feet long. There are PoE repeaters to let you extend that distance without needing additional power cables. What situation requires you to be viewing a video feed from a raspberry pi a long distance away that wouldn't be better served with ethernet?

Re: Raspberry Pi 4

#850

Post by StudentStuff »

rubyfan wrote: post #346
StudentStuff wrote: post #93

Earlier quoted context omitted.

The OrangePi 3 at $40 is also pretty neat, PCIe 1x, 8GB onboard eMMC, 4x USB 3.0, Bluetooth 5, Wireless AC (pretty sure they beat Raspberry Pi to the punch on this...) and it has mainline kernel support: http://www.orangepi.org/Orange%20Pi%203/

Software support is lacking in this device. No OpenGL, no retro gaming with the March 2019 images. Are you configuring yours differently?

Old and new Mali GPUs just got mainline kernel support: https://news.ycombinator.com/item?id=19908741
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