Raspberry Pi Forums

rodizio

You may want to have a look at this before you start re-inventing everything ;) https://github.com/bortek/EZ-WifiBroadcast/wiki https://www.rcgroups.com/forums/showthread.php?2664393-EZ-WifiBroadcast-cheap-digital-HD-transmission-made-easy%21 https://www.youtube.com/watch?v=bfz9F9lOMm8 https://vimeo...

rodizio

Mine also is affected. Bought on 7th of April at Conrad Electronic in Germany.

rodizio

Hey Paeryin, I've tried your openvg fork now. CPU load reported by top for my process went down from about 16% to 11%, rendering time (time measured from before Start() to after End() call) from about 55ms to 25ms. More than 100% speed increase plus lower CPU load just by swapping the libraries, tha...

rodizio

has anything changed inside the kernel regarding MT7601 dongles from 4.4 to 4.9? Users of my EZ-Wifibroadcast distribution report that their MT7601 adapters stopped working after I upgraded the image from kernel 4.4 to kernel 4.9.35. The card is detected by the kernel: dmesg: [ 1.681561] usb 1-1.5: ...

rodizio

Exactly what I couldn't find somehow. Thanks a lot.

rodizio

Is there a Raspbian release history somewhere? Possibly with changelog and the older images for download?

I would like to download the image before the latest (2017-04-10), don't know what it's version name is and can't find anything.

rodizio

There is the alternate acronym for MPEG - Motion Pictures Except Grass. LOL. Yeah, I know similar effects from watching DVB-T (mpeg-2 I think) around new years eve, when it shows fireworks, it gets really blocky, seems to be something the codec cannot deal with very good. I just wouldn't have thoug...

rodizio

I found something where I'm not sure if this is correct behavior of the camera (or the h264 encoder). When walking through the woods, sometimes parts of the images are heavily "blocky". At first, I attributed this to the complex light conditions in a forest and the fact that in wintertime there is n...

rodizio

The other thing I have noticed is that if I connect the wifi dongle whilst the RPI is on, it hangs. If I reboot the RPI comes up, but the eth0 is completely unresponsive as is my wireless keyboard plugged into a spare USB port Yeah, USB on the Pi has always been and still is a mess. Simple things l...

rodizio

While that sounds logical from a developers perspective, it's quite weird from the user's perspective ;) Is there no way of finding out which resolution, fps and mode the cam is actually using? With those kinds of differences and "corner cases", I always feel like "hmm, is it _really_ doing what I t...

rodizio

Whichever mode it reckons fulfils the criteria specified and should give the best image quality. On the V2 camera that is predominantly frame rate dependent (which side of 40fps). Yes, this was also my understanding and why I asked why there is a difference. You don't say how the FOV is changing be...

rodizio

Why do I get a different FOV when running

Code: Select all

raspivid -w 1280 -h 720 -fps 48 -t 0 -md 6

compared to:

Code: Select all

raspivid -w 1280 -h 720 -fps 48 -t 0

Cam is a Pi V2 cam. Which mode is the cam using when not explicitly setting the mode?

rodizio

Thanks for the info guys. Edited my initial post regarding hardware/software uart to not confuse others. Is it maybe possible (with everything being so small and the PCB having many layers I doubt it, but ...) to access these pins somewhere else on the PCB? Just did some more searching on the topic,...

rodizio

Just to clarify for me, as I understand, on the Pi3 there are the following options: - disable BT and have UART0 (ttyAMA0) on the TXD/RXD pins on the GPIO header for external connections - keep BT enabled and have UART1 (ttyS0) on the TXD/RXD GPIO pins for external connections - keep BT enabled and ...

rodizio

Never seen something like this in dmesg log, what does it mean?

[43203.321224] vchiq: 0: prs DATA@b6c988d0 (18->4) - invalid/closed service 4
[51833.521239] vchiq: 0: prs DATA@b6c98808 (18->4) - invalid/closed service 4

rodizio

Regarding the overclocking not increasing openVG performance:

Setting gpu_freq=400 and force_turbo=1 in config.txt sped up things quite a lot for me. Force turbo is important.

rodizio

Thanks for the info. Sounds not too good though ... When I spoke of the compute module, I meant complete with I/O board, designing and building a smaller solution would be too much effort. Reason for two Pi Zeros being better than one compute module is simple: It's twice the horsepower ;) There are ...

rodizio

I have recently played around with 3D live video on the Pi (by running two Pi's with two cams as transmitters and modified hello_video.bin instances on the receivers, one rendering the left image, the other rendering the right image as a quick hack), but got really sick after 2 minutes. This doesn't...

rodizio

Thanks for the good explanation, will give it a try. The thing with the rotation around 0,0 probably explains why stuff didn't show up anymore with my failed attempts so far, I rotated it off the screen

rodizio

Just tried again, looks like something has been fixed in the firmware or so. Maybe it's still of interest for someone, the following settings in config.txt are needed: max_framebuffer_width=1080 max_framebuffer_height=1920 display_rotate=3 hdmi_ignore_edid=0xa5000080 hdmi_timings=1080 0 118 4 118 19...

rodizio

I'm using this code based on the OpenVG library to display an on screen display (text and graphical elements) on the Raspberry: https://github.com/SamuelBrucksch/wifibroadcast_osd Now I would like to rotate the whole OSD (i.e. everything) 270 degrees since I'm using a portrait mode 1080x1920 screen ...

rodizio

Since harddisks have their own controller and cache it might fix that problem. But didn't even bother to try it, would be an expensive, heavy, ugly and clumsy workaround. I'd rather like to find out why it's not possible to write a few hundred kilobytes per seconds to SD cards or USB sticks and if i...

rodizio

Have tried now: - Kernel compiled with 1000Hz timer freq - Different IO schedulers - Even more different sysctl values and settings - Several different (and fast) USB sticks and SD cards - nice and ionice on the processes in different combinations - Different wifi sticks for receiving - ext4 and fat...

rodizio

So far it works for me, but another user who also tried 1000Hz _without_ RT patches (to get rid of the USB latency which causes delayed wifi packets) reported problems when using wifi cards and an USB joystick at the same time. I tried my image with the new 1000Hz kernel option, and I can not login ...

rodizio

Just for clarity, in my case the issue happens _without_ using any RT patches, the only change I made to the rpi-source kernel was setting the timer frequency to 1000Hz. Did some kernel compilations while receiving wifi packets (this would make it freeze often), seems stable now with the above menti...

Search found 39 matches

Re: Cheap RC airplane with "outboard" Pi Zero and camera

Re: Raspberry Pi 3 B+ lockups

Re: How to increase OpenVG time performances

Re: Problem with Wireless Network Adapter Ralink MT7601U

Re: Raspbian release history?

Raspbian release history?

Re: Artifacts, "blocky" video stream

Artifacts, "blocky" video stream

Re: WiFi dongle with monitor mode?

Re: New 8MP Camera - Q&A thread

Re: New 8MP Camera - Q&A thread

Re: New 8MP Camera - Q&A thread

Re: Overlay to remap Pi 3 UART

Re: Overlay to remap Pi 3 UART

What's this strange kernel messages?

Re: How to increase OpenVG time performances

Re: Stereoscopic camera capture - now implemented.

Re: Stereoscopic camera capture - now implemented.

Re: Example program to draw random shapes using the C compil

Re: 6 inch 1080x1920 HDMI display - no picture

Re: Example program to draw random shapes using the C compil

Re: Disk I/O seems to freeze system

Re: Disk I/O seems to freeze system

Re: Freezing with RT-patch (Pi 3)

Re: Freezing with RT-patch (Pi 3)