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by Danara
Thu Apr 19, 2018 1:23 pm
Forum: Troubleshooting
Topic: netboot works but reboot doesn't
Replies: 7
Views: 941

Re: netboot works but reboot doesn't

I'm not even getting that far with the 3b+ With a rpi 3, it boots and reboots from the piserver every time. Using the same setup, a 3b+ gives me nothing but red led + 4 green led flashes. The piserver sees the 3b+ mac address (which was added in piserver), but nothing else seems to work on the 3b+ A...
by Danara
Wed Dec 04, 2013 4:47 pm
Forum: Camera board
Topic: STICKY: New features for raspistill command
Replies: 106
Views: 115046

Re: New features for raspistill command

Sorry, simply don't have the time to look at it at the moment. I have three camera modes that really need sorting out - full FOV video; 60fps; 90fps. Glad to see full FOV is at (or near) the top of the list. I've had to resort to other using usb webcams while waiting for this to happen, but I'd muc...
by Danara
Tue Oct 22, 2013 4:17 pm
Forum: Camera board
Topic: Frame synchronisation
Replies: 82
Views: 32782

Re: Frame synchronisation

...[snip]... If you're willing to wait for a while until the cameras sync, you could also pull the R-Pi board's 19 MHz crystal X2 (or use an external VCO clock signal) and a PLL setup to gradually slow down or speed up the second R-Pi's system clock, until the accumulated phase lag causes the frame...
by Danara
Mon Apr 22, 2013 2:44 pm
Forum: OpenGLES
Topic: Copy texture to texture
Replies: 2
Views: 2054

Re: Copy texture to texture

Thanks! I'll try that method soon, and see how it compares to what I'm doing now, which is to copy the area I want using glReadPixels, and then use that buffer as a texture. I was expecting poor performance with this, but on the RPi, it actually performed quite well. Perhaps this is due to DMA and t...
by Danara
Sun Apr 21, 2013 4:20 pm
Forum: OpenMAX
Topic: Video_splitter component
Replies: 5
Views: 1965

Re: Video_splitter component

I've done a lot of that too, but the learning curve for people not familiar with it is pretty steep. The hello_pi examples are very useful for people learning to program on this platform -- I just think it would be helpful if there were more working simple examples covering some of the other compone...
by Danara
Sun Apr 21, 2013 3:05 pm
Forum: OpenMAX
Topic: Video_splitter component
Replies: 5
Views: 1965

Re: Video_splitter component

It would be nice if we could "fill-out" examples for all the omx components, like the existing ones under Hello_pi. It is much easier to learn how to use them when you have a working example to start with.
Video splitter is one, but there are others I would like to see as well.
by Danara
Sat Apr 20, 2013 10:52 pm
Forum: OpenMAX
Topic: Video_splitter component
Replies: 5
Views: 1965

Video_splitter component

I am quite intrigued by the video_splitter OMX component. Has anybody been able to make this work? I have been unable to locate much of anything in the way of example code for any platform, let alone the RPi. Anybody used this component yet?
by Danara
Sat Apr 20, 2013 10:31 pm
Forum: OpenGLES
Topic: Copy texture to texture
Replies: 2
Views: 2054

Copy texture to texture

My application needs to compare adjacent frames of an MJPEG stream. I am decoding the jpegs via OMX, and each frame is displayed on the screen in GLES via a texture populated by egl_render. I would like to use a shader to subtract each new frame from the one that precedes it, but I can't manage to l...
by Danara
Sat Apr 20, 2013 8:46 pm
Forum: C/C++
Topic: OpenMAX: How to decode a JPEG (example source code)
Replies: 67
Views: 36134

Re: OpenMAX: How to decode a JPEG (example source code)

Thanks Dan! I should have mentioned that my images are very small to begin with (thumbnails from YouTube) and then I'm further downsizing them even smaller. I think around 88x75 how I have my settings now. Seems like, in my program, the libjpeg version (with fast integer re-sizer) is fastest, and r...
by Danara
Sat Mar 30, 2013 4:43 am
Forum: General discussion
Topic: Turning the R-Pi into a parallel System
Replies: 16
Views: 9710

Re: Turning the R-Pi into a parallel System

I hear you on the power issue. I believe that even with the 64 core unit, the parallella still consumes only 5 watts total. The intention for the parallella core is to be able to target the smartphone market, so power consumption is very high on the criteria list. They hope to release a 1000 core un...
by Danara
Sat Mar 30, 2013 4:30 am
Forum: C/C++
Topic: OpenMAX: How to decode a JPEG (example source code)
Replies: 67
Views: 36134

Re: OpenMAX: How to decode a JPEG (example source code)

Initially, your results seem quite different than what I was seeing, but I was able to reproduce your error message using an image which is much smaller than what I normally use. When I use an image of 1280x720 (123kb), the error doesn't appear, and the output is good. When I resize that same image ...
by Danara
Fri Mar 29, 2013 6:01 pm
Forum: General discussion
Topic: Turning the R-Pi into a parallel System
Replies: 16
Views: 9710

Re: Turning the R-Pi into a parallel System

One of the two unpopulated connectors on the Pi is intended for a camera, which might have the bandwidth required to connect to another Pi (at least in one direction anyway). One of the downsides of the SOC is that a lot of the high speed bus connectivity is locked inside the silicon sandwich. The u...
by Danara
Thu Mar 28, 2013 5:51 pm
Forum: C/C++
Topic: OpenMAX: How to decode a JPEG (example source code)
Replies: 67
Views: 36134

Re: OpenMAX: How to decode a JPEG (example source code)

All I did, inside the hello_jpeg.cpp, I am looping around "DoIt" function for a very long time. I put a for loop around this function, and looping it for 100000 times. But, everytime, after few minutes of running, after looping around for only couple thousand loops, the prgram exits by Segmentation...

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