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by abramq
Thu Apr 27, 2017 9:46 am
Forum: Camera board
Topic: Using threads in C for reducing picamera dropped frames
Replies: 10
Views: 1889

Re: Using threads in C for reducing picamera dropped frames

Maybe would be good to write frames to RAM disk and then, when finished to SD? RAM disk works very fast, there are tools to make this in Linus, maybe in RPI too?
by abramq
Sat Apr 22, 2017 8:03 am
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

Re: What is the format (YUV or jpeg) of taken pictures?

But there are even more wonderful things and more real. For example, threads with matching topics ;-)
Ok, it will probably end this thread. Thanks once more for all people who have dedicated their time and shared their knowledge. RPI has really the best community.
Greetings!
by abramq
Fri Apr 21, 2017 7:03 pm
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

Re: What is the format (YUV or jpeg) of taken pictures?

P.S.
That's a pity that Mr jamesh locked my second thread about the entire project - probably more people would read and answer. This thread has a topic completely different what we are talking now... This thread should have been closed, not that.
by abramq
Fri Apr 21, 2017 6:58 pm
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

Re: What is the format (YUV or jpeg) of taken pictures?

(b) You're not really thinking about the whole pipeline. A I said, I have no ready receipt now. I see a transmisson (maybe TCP) in two separated "channels" between RPi and Android smartphone. The first channel sends pictures, the second channel sends info about the number of the picture sent by the...
by abramq
Fri Apr 21, 2017 6:34 pm
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

Re: What is the format (YUV or jpeg) of taken pictures?

My impression is that you do not want to reveal what you are really trying to do, but I think WebRTC together with the WebRTC Statistics API is your only reasonable solution. And my impression is that people like to look for a black cat in the black room. It could be difficult, especially when ther...
by abramq
Fri Apr 21, 2017 1:51 pm
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

Re: What is the format (YUV or jpeg) of taken pictures?

The problem is you haven't really specified your requirements accurately. You want, I think, something that doesn't freeze? Or if it does, warns you about it? No, the application on a smartphone will inform only about quality of streaming movie (about delay, about dropped frames, about no streaming...
by abramq
Fri Apr 21, 2017 1:44 pm
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

Re: What is the format (YUV or jpeg) of taken pictures?

My project is not ready jet, I am just working on the concept first - to not waste time when I start implementing then. I have read many threads about streaming video by RPi and can not see there "ready existing solutions" which meets my requirements. Please let me know if you know such solution - i...
by abramq
Fri Apr 21, 2017 12:37 pm
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

Re: What is the format (YUV or jpeg) of taken pictures?

I'm really not sure what you are trying to do here. Might be worth starting again, trying to describe what the problem is, and how you think it need to be fixed? Starting again or a new thread? I start here because new thread could be locked as duplication ;-) Imagine a remotely performed surgery o...
by abramq
Fri Apr 21, 2017 11:01 am
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

Re: What is the format (YUV or jpeg) of taken pictures?

The fact that you are receiving data is confirmation that the camera is still producing data. I am not sure... The video player can hang up, browser can hang up... and you will see the last picture only non-stop. That's left as an exercise for the reader. But would be very hard to make my own MJPEG...
by abramq
Fri Apr 21, 2017 10:32 am
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

Re: What is the format (YUV or jpeg) of taken pictures?

I suspect that you are misunderstanding how almost all cameras under Linux are working then. What specific "control" do you need over the frames? (...) Well, as I described in that other thread there is camera on one side and (kind of) preview on the other side (let's say it is a Android phone). Th...
by abramq
Fri Apr 21, 2017 9:59 am
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

Re: What is the format (YUV or jpeg) of taken pictures?

It depends on which application you use. raspivid will write either an H264 elementary stream, or an MJPEG stream (a bunch of JPEGs glued together). Sounds good! Thank you! Is it possible to use that programs on RPI working as a headless mode (no GUI)? From your other thread you're wanting >15fps, ...
by abramq
Fri Apr 21, 2017 9:54 am
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

Re: What is the format (YUV or jpeg) of taken pictures?

This looks like a half duplicate of https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=181153 Forgive me, I did not intend to do two the same threads. This thread is only question about picture format and I get the answer, thanks to all! But that other thread is about something different - abo...
by abramq
Fri Apr 21, 2017 9:20 am
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

Re: What is the format (YUV or jpeg) of taken pictures?

Well, so what is the format of file I get when saving taken pictures into SD card? (sorry I have no RPI jet). For me, would be the best to get a jpeg file instantly, without launching separated job for conversion. p.s. Sorry for that 'half-duplication' but it was necessary to describe the entire pro...
by abramq
Fri Apr 21, 2017 7:37 am
Forum: Camera board
Topic: Unusual concept of video streaming project-kindly ask 4 help
Replies: 1
Views: 605

Unusual concept of video streaming project-kindly ask 4 help

To show the concept I must tell you what it the "secret" of my project. The task is seemingly simple - streaming video from the camera, but with "real time" control of "sureness" of that video. I mean to deliver a preview from the camera to the endpoint, shifted in the time as low as possible (<1 se...
by abramq
Fri Apr 21, 2017 6:52 am
Forum: Camera board
Topic: Possible to take pictures to RAM (without store it on SD)?
Replies: 5
Views: 1033

Possible to take pictures to RAM (without store it on SD)?

The picture would be processed after taking, so processing it into RAM would be faster. Is it possible to take the picture directly to RAM and modify it in RAM and then store modified picture to SD card?
by abramq
Fri Apr 21, 2017 6:49 am
Forum: Camera board
Topic: What is the format (YUV or jpeg) of taken pictures?
Replies: 26
Views: 3517

What is the format (YUV or jpeg) of taken pictures?

Hello,
Pictures were taken by camera module (I am thinking of RPi Zero W) - are they instantly compressed (jpeg) or not (YUV)?
I am going to take many pictures in short time and wonder if it is necessary to compress them then?
by abramq
Wed Feb 01, 2017 12:58 pm
Forum: Advanced users
Topic: Could WiFi work in WiFi-Direct mode (w/o router)?
Replies: 1
Views: 593

Could WiFi work in WiFi-Direct mode (w/o router)?

Hello,
Is it possible to get a WiFi-Direct connection from RPi (using built-in WiFi module or added one) to - for example - smartphone and send a file to it? I mean with not using router.
Thanks in advance for every answer!
by abramq
Thu Dec 01, 2016 9:56 am
Forum: Camera board
Topic: Pi + camera - sending pictures over Bluetooth, Help
Replies: 0
Views: 663

Pi + camera - sending pictures over Bluetooth, Help

Hello, I am going to use the camera and send picture, taken by that camera over bluetooth (finally to smartphone). The smartphone side (receivng bluetooth signal from my own Android app) is not problem. I wonder what tools / libiaries to use on the Pi side. Would you help please? I have only found a...
by abramq
Wed Jul 13, 2016 4:54 pm
Forum: Beginners
Topic: RPI3 - Possible to switch off (zero power) the WiFi and BT?
Replies: 10
Views: 2618

Re: RPI3 - Possible to switch off (zero power) the WiFi and

Well, no one knows the sure answer?
by abramq
Mon Jul 11, 2016 8:17 pm
Forum: Beginners
Topic: RPI3 - Possible to switch off (zero power) the WiFi and BT?
Replies: 10
Views: 2618

RPI3 - Possible to switch off (zero power) the WiFi and BT?

Hello, I am using RPI2, but going to buy RPI3. I use Ethernet connection and no Bluetooth. Is there possibility to completely switch otf the on-board WiFi and BT on RPI3? I use RPI with no graphic front end, only ssh - so the method of switching off should be also non-graphical. I mean there will be...
by abramq
Tue Mar 22, 2016 2:16 pm
Forum: Advanced users
Topic: Security of openning ports
Replies: 4
Views: 743

Re: Security of openning ports

Thanks a lot. That's what I was thinkig of.
by abramq
Tue Mar 22, 2016 1:11 pm
Forum: Advanced users
Topic: Security of openning ports
Replies: 4
Views: 743

Re: Security of openning ports

Thanks for that explaination! I was thinking, that if any port (even not often used, like 5000) is open so it acts like a barrel of honey to a bear :-) and will attract the potential attackers to keep trying to get in (making my internet bandwidth busy of their packets).
by abramq
Tue Mar 22, 2016 12:38 pm
Forum: Advanced users
Topic: Security of openning ports
Replies: 4
Views: 743

Security of openning ports

When we want to use PI oustide, we have to open (and forward) ports for SSH on our routers. As I know it is visible outside for others, that a port is opened here. Does it menas that more "hackers" will try get in and - finally - our internet connection will be more jammed than when we have all port...
by abramq
Fri Mar 13, 2015 11:34 pm
Forum: Media centres
Topic: pi 2 media centre
Replies: 3
Views: 1450

Re: pi 2 media centre

Try also Xbian for RP2.
I am using it for a week (after playing with OSMC) and... it is lovely!
Greetings!
by abramq
Thu Feb 12, 2015 9:03 pm
Forum: Advanced users
Topic: Pi2 - is the file transfer over ethernet better than B+ ?
Replies: 31
Views: 20928

Re: Pi2 - is the file transfer over ethernet better than B+

Well, when you connect it to Pi, you will choke the usb port, which is usb 2.0, not 3.0 like the hub. And that Pi's usb port is not so strong to take so high speed (still 'weak' chips).
Anyway, would be interesting to see what real speed you can get with this equipement.

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