Author Topic: Build an Cam?  (Read 9009 times)

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Online blueskull

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Re: Build an Cam?
« Reply #25 on: November 07, 2016, 06:56:03 am »
How does the other people do it? I dont thing the have an 1000€ cam.  :-//
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Also, 12G-SDI capture card
Why? There is normally some other interface.
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You need 4*PCIe SSDs in RAID0 to reliably sink such data stream.
Why SSD not HDD? SAS Drives should be enough.
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You need a 12-core 2.5GHz+ Xeon E5 to transcode in real time if you want to stream your video.
Not in 4k. I am happy when I could pipe 480p over an internet connection.
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You will pay more for Internet connection.
Why? 50€ for an Flat?

To address your first question: the suggestion I gave is for serious producers, like a TV station doing field shooting. You can choose to shoot in TV quality or crappy smartphone quality.
To address your second question: professional gears use SDI as a standard I/F. HDMI capture cards can rarely capture at 4K 60fps. DP capture cards are just as expensive as 12G-SDI.
To address your third question: to reliably flush 4.2GBps in disk, you need 40*7.2k SAS drives or 30*10k/15k SAS drives, that's gonna be more expensive than 4*Samsung 960Pro SSDs.
To address your fourth question: you still need to read in 4.2GBps of data, though you then downsample the input. Your CPU still needs to handle 3*4K RAW input.
To address your final question: to stream at 480p, maybe you don't need a ridiculous fast and expensive Internet connection.
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Offline Lord of nothing

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Re: Build an Cam?
« Reply #26 on: November 07, 2016, 07:07:44 am »
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to stream at 480p, maybe you don't need a ridiculous fast and expensive Internet connection.
Thats why I would stream in an lower Quality. Streaming on 300Km/h isnt that easy.
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To address your first question: the suggestion I gave is for serious producers, like a TV station doing field shooting.
thats to goal.
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professional gears use SDI as a standard I/F. HDMI capture cards can rarely capture at 4K 60fps. DP capture cards are just as expensive as 12G-SDI.
Again why an Capture Card and not an direct connection like: https://en.wikipedia.org/wiki/Camera_Serial_Interface
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than 4*Samsung 960Pro SSDs.
I could not find it. Maybe the dont sold in my Area.
What kind of SSD are that? SLC?
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Online blueskull

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Re: Build an Cam?
« Reply #27 on: November 07, 2016, 07:34:50 am »
1. Thats why I would stream in an lower Quality. Streaming on 300Km/h isnt that easy.
2. thats to goal.
3. Again why an Capture Card and not an direct connection like: https://en.wikipedia.org/wiki/Camera_Serial_Interface
4. I could not find it. Maybe the dont sold in my Area.
5. What kind of SSD are that? SLC?

1. At that speed, doppler effect screws up many modulation mechanisms. Look for LTE or WCDMA maybe.
2. No TV stations use <$1000 camera to shoot A roll. Maybe a cheap consumer camera for B roll, but that's based on the assumption of sufficient lighting.
3. CSI is a MIPI standard, which is inherently a consumer standard. To shoot quality shots in a tunnel, you need 14-bit sensor, which are in the professional regime. Some high dynamic range sensors may be available in consumer gears such as top of the line Apple and Sony phones, but to handle that amount of data, you need quite some R&D force and quite some expensive IP cores and FPGA boards. Finally, the cost you will spend on buying MIPI standard may not be cheap either ($4k/yr).
4. https://www.amazon.com/Samsung-960-PRO-Internal-MZ-V6P512BW/dp/B01LXS4TYB It's not available now, it will start shipping on Nov. 13th.
5. MLC (native TLC cell, but only 2 bits are stored per cell, so effectively MLC) with SLC cache.
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Offline Lord of nothing

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Re: Build an Cam?
« Reply #28 on: November 07, 2016, 07:42:05 am »
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Look for LTE or WCDMA maybe.
you know that the Window are metal coated? The block the Signal. The other thing is next to the Railway Track is the coverage poor. The best thing is when I use the Wifi onboard. When the Company allow me to do this i will talk to then for an dedicated upload speed.

You talk about professional things. How does the Youtuber do it now? The quality of there videos are good.

ok the SSD have no SAS or SATA Port how to run with an Raid Controller?
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Online blueskull

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Re: Build an Cam?
« Reply #29 on: November 07, 2016, 07:47:37 am »
1. You talk about professional things. How does the Youtuber do it now? The quality of there videos are good.
2. ok the SSD have no SAS or SATA Port how to run with an Raid Controller?

1. I watch LinusTechTips videos and they have some episodes introducing their gears. Their high video quality is definitely at a premium.
2. Soft RAID, or just use 3 drives with 3 separate partitions, each for a video stream. You need enough PCIe BW. These drives use PCIe 4x, so you need at least 12 PCIe 3.0 lanes reserved for them. A typical X99 motherboard will give you access to a 4x m2 slot, a 16x full size PCIe slot and a 8x PCIe slot. You can hack 2*4x m2 SSDs in a 8x slot without performance degrading. If you also want a GPU installed, you need a CPU that has 40 PCIe lanes (lower end 2011-3 CPUs have only 28 lanes).
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Offline BravoV

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Re: Build an Cam?
« Reply #30 on: November 07, 2016, 07:53:53 am »

So its possible to build my own Cam with?
I know its not like Lego....  :-DD


So what is required for that?
My idea is ........


Simple question, as you started this in Beginner section ...

 What is your current skillset and experience in electronics and optical ? Your current equipments ?

Clue about that will save lots of useless posts ....
« Last Edit: November 07, 2016, 07:58:13 am by BravoV »
 

Offline Lord of nothing

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Re: Build an Cam?
« Reply #31 on: November 07, 2016, 08:06:14 am »
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What is your current skillset and experience in electronics and optical ? Your current equipments ?
none  :-//  :-[
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I watch LinusTechTips videos
me to.  :-+

@blueskull
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Offline Kilrah

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Re: Build an Cam?
« Reply #32 on: November 07, 2016, 10:23:38 pm »
You talk about professional things. How does the Youtuber do it now? The quality of there videos are good.
Again there are many ways to do things. What you asked for (broadcast quality 4K, low compression, many hours of recording...) WILL require multi-thousand $ professional gear. As surprising as it may sound many youtubers do have access to that kind of equipment to work with.

You could also take 2 smartphones, one recording 4K to a 250GB SD card and the other filming the same thing but only doing the streaming and have something to work on, maybe not that long a recording... but meh.

A decent semi-pro solution would be to take a good camera like a Sony A7S + lens and power supply (maybe ~$2.5k total), and record ProRes externally to an Atomos Ninja Flame with a 2TB SSD and power supply (~$2.3k total). Then connect a Teradek VidiU web streaming encoder to the Ninja's loopback output ($700).
That will give you the high dynamic range 4K camera with the best cost/quality ratio, ability to record many hours of high quality log footage for best possible post-production capability, as well as stream a color-corrected version of the footage for pretty cheap in the field.

The equipment can obviously be rented, you don't need to buy 6k of equipment (+another 10k of you want 2 more cam/recording sets in addition to the main cam/recording/streaming set) to do a 2-day project. Most video productions use rented gear, they won't buy something for just one project.

Any less than that and you're quite unlikely to have someone accept your project. They want to be confident about the quality and reliability of what they will do/get, and it's not with a DIY solution with a hacked up RPi that you'll get that when there's perfectly good gear out there to do it. Pro jobs want trusted Pro gear.
« Last Edit: November 07, 2016, 10:26:14 pm by Kilrah »
 

Offline Lord of nothing

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Re: Build an Cam?
« Reply #33 on: November 12, 2016, 09:57:33 pm »
I see its better when I start first the Training.  :-//
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