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by deivid
Mon Jul 10, 2017 12:02 am
Forum: Advanced users
Topic: Raspberry boots with 0 audio channels on hdmi
Replies: 0
Views: 308

Raspberry boots with 0 audio channels on hdmi

Hi I'm using an hdmi capture card (hdmi to mpegts over ethernet), that doesn't detect any audio channels on the pi until it plays something ; it's not related to volume as: gst-launch-1.0 audiotestsrc freq=50 volume=0 ! autoaudiosink makes it work. ffmpeg says this about the valid input: Input #0, m...
by deivid
Sat Jul 08, 2017 11:33 pm
Forum: Advanced users
Topic: framebuffer/tty is smaller than physical screen
Replies: 1
Views: 538

framebuffer/tty is smaller than physical screen

Hi, I'm having a weird issue: The tty behaves as if the overscan / underscan settings were wrong For example systemd's boot messages are constrained to a subsection of the screen as are actual programs when run (see pygame image). however omxplayer uses the entire screen. This issue arose when chang...
by deivid
Sat May 23, 2015 5:45 am
Forum: General discussion
Topic: WebRTC V8/WebM
Replies: 9
Views: 9138

Re: WebRTC V8/WebM

At the moment I'm using a pi 1 (seems like my new pi2 broke) streaming h264+aac over rtmp. I'd like to use janus to "convert" a file (later it'll be the rtmp feed) to "webrtc" I've disabled the audio on ffmpeg because I don't know how to deal with it on gstreamer. Could you help me? (I know ffmpeg, ...
by deivid
Fri May 22, 2015 9:24 pm
Forum: Camera board
Topic: CBR raspivid ffmpeg
Replies: 12
Views: 2405

Re: CBR raspivid ffmpeg

the -b (bandwidth) option will do what you want, set a constant bitrate
by deivid
Fri May 22, 2015 8:44 pm
Forum: Camera board
Topic: New camera+Rpi2 - No data received from sensor
Replies: 0
Views: 1231

New camera+Rpi2 - No data received from sensor

Hi I've bought a raspi2 and a noir camera and the LED of the camera lights up on raspistill, vcgencmd shows the cammera is supported and connected but it doesn't work. The camera is corrected correctly to the board. $ raspistill -v -o image.jpg raspistill Camera App v1.3.8 Width 2592, Height 1944, q...
by deivid
Tue May 12, 2015 7:16 am
Forum: Advanced users
Topic: [Guide] Pulseaudio 5 on Wheezy
Replies: 143
Views: 102192

Re: [Guide] Pulseaudio 5 on Wheezy

I'm trying to cross compile ffmpeg with libpulse support and I thought this might be the best place to ask. I've already built a static binary with all the codecs I need, but it uses alsa. To enable pulse I added "--enable-libpulse" to the configure command, but I keep getting ERROR: libpulse not fo...
by deivid
Tue Apr 14, 2015 4:39 am
Forum: Other projects
Topic: Audio over SSH
Replies: 1
Views: 598

Re: Audio over SSH

Edit: easiest way: use mumble There's an implementation of exactly that on the forums. I will try to look it up. In the meantime you can use ffmpeg. Something like this to multicast your mic: ./ffmpeg -f alsa -ar 48000 -ac 1 -i sysdefault:CARD=Set -ac 1 -c:a mp2 -ab 32k -f rtp rtp://234.168.1.3:1234...
by deivid
Sun Apr 05, 2015 12:38 am
Forum: Graphics, sound and multimedia
Topic: Outputting wav file directly to jack/pwm pin
Replies: 2
Views: 741

Re: Outputting wav file directly to jack/pwm pin

lots of players can read from pipes. just read/write to a pipe
by deivid
Sun Apr 05, 2015 12:07 am
Forum: Networking and servers
Topic: Is this feasible? (Solar Powered Server)
Replies: 2
Views: 940

Re: Is this feasible? (Solar Powered Server)

As you said, RPi runs the ethernet port off the USB bus, so no, it won't work. Instead of getting a NAS (generally expensive) you could get another ARM board with gigabit nic and USB3. You might still be limited by the board, but not as much, by far. These are also more expensive. Look up odroid or ...
by deivid
Thu Mar 19, 2015 4:26 pm
Forum: Camera board
Topic: Ultraviolet light with NOIR camera
Replies: 17
Views: 11557

Re: Ultraviolet light with NOIR camera

LitterBugs: If I do get a UV Black(403) filter (such as this ), do you think I'll achieve a better result? I have to pay ~$45 for shipping anyway Riklaunim: I don't really care if a little IR leaks in, this'll be done indoors with a UV torch. I can get the schott bg39 on ebay a little cheaper, and t...
by deivid
Thu Mar 19, 2015 3:16 am
Forum: Camera board
Topic: Ultraviolet light with NOIR camera
Replies: 17
Views: 11557

Re: Ultraviolet light with NOIR camera

You are the best!
Where did you order the UV pass filter? I have a hard time getting them locally. I'll order a set ASAP
by deivid
Thu Mar 12, 2015 9:59 pm
Forum: Camera board
Topic: Ultraviolet light with NOIR camera
Replies: 17
Views: 11557

Ultraviolet light with NOIR camera

Hi We are launching an awareness campaign for skin cancer and we'd like to show people something like this video: https://www.youtube.com/watch?v=o9BqrSAHbTc . I'm wondering if the noir camera can see something similar to the first video, could anyone with the camera and an UV lamp help me out? If y...
by deivid
Wed Dec 10, 2014 4:31 am
Forum: Graphics, sound and multimedia
Topic: using jack/alsa for streaming audio
Replies: 4
Views: 3008

Re: using jack/alsa for streaming audio

Most likely the delay comes from 'setting up' avconv and starting the stream. Try reducing probesize and analyzeduration flags, and reduce buffers both on the 'producer' and 'consumer'. To be sure the delay is not caused by avconv, try arecord | aplay with the necessary settings (devices, bitrates),...
by deivid
Fri Dec 05, 2014 6:42 pm
Forum: Graphics, sound and multimedia
Topic: Board w/ Camera & Transmitter
Replies: 2
Views: 776

Re: Board w/ Camera & Transmitter

raspberry A+, wifi dongle, raspi camera. I think you can run it for at least 2 hours with 4xAA.
Software side: ffmpeg with rtp
by deivid
Fri Dec 05, 2014 6:05 pm
Forum: Graphics, sound and multimedia
Topic: alsaloop usage
Replies: 5
Views: 5344

Re: alsaloop usage

try
arecord -Dhw:1,0 | aplay -Dhw:1,0
by deivid
Tue Dec 02, 2014 11:02 pm
Forum: Camera board
Topic: Change ROI Live (and crop instead of stretch)
Replies: 5
Views: 1665

Re: Change ROI Live (and crop instead of stretch)

I'll look it up. Is there a v4l driver for the raspi cam? That'd be easier. Searching for v4l raspberry pi on google gets me results on normal cameras, not the raspi cam itself
by deivid
Mon Dec 01, 2014 2:53 pm
Forum: Camera board
Topic: Change ROI Live (and crop instead of stretch)
Replies: 5
Views: 1665

Change ROI Live (and crop instead of stretch)

Hi I'm using raspivid piped to ffmpeg and I'd like to change the ROI on the fly, how can I do it? Should I use the V4L2 driver? Also, I'm using a low resolution and cropping it because the output is stretched to the "original" size. I.E: I'm using 960x544 but I'd like to use 1920x1080 and then CROP ...
by deivid
Sun Nov 16, 2014 6:33 am
Forum: Camera board
Topic: RaspberryPi Camera for Astrophotography
Replies: 345
Views: 108623

Re: RaspberryPi Camera for Astrophotography

gordon77 wrote:noir[...]
I saw your post about taking a pic with an UV filter, does that mean that you can capture UV light? if so, could you take a picture of your face? I'm looking to set up an UV-capturing camera to 'check' people's skin
by deivid
Wed Nov 12, 2014 9:30 pm
Forum: General discussion
Topic: New RPI model A+ Q&A Thread
Replies: 55
Views: 16086

Re: New RPI model A+ Q&A Thread

I actually need one usb port and an ethernet port. Is there any cheap accesory for this? I'm from argentina and buying an ethernet->usb adapter here costs about 25 USD so it's a no-go. I'm using a B+ atm but could use an A+ if I get one ethernet port and one usb port (with an accesory/adapter of cou...
by deivid
Wed Nov 12, 2014 5:53 am
Forum: C/C++
Topic: Problem with framebuffer based SDL program
Replies: 0
Views: 435

Problem with framebuffer based SDL program

I'm making a framebuffer based image gallery using SDL and it works, but if for some reason the program crashes (specifically: not calling SDL_Quit) then the framebuffer will get 'locked', meaning that I can't start the program again until I reboot the pi. This runs on my x86 machine on framebuffer ...
by deivid
Wed Nov 12, 2014 5:51 am
Forum: Graphics programming
Topic: Programmically controlling FBI or another image viewer
Replies: 4
Views: 3624

Re: Programmically controlling FBI or another image viewer

I made a framebuffer based SDL image viewer, you'll have to modify it to work for you because currently it only reads images that are numbered and in order (1.png,2.png ...n.png) and goes forward/backward

https://github.com/DavidVentura/sdl-image-viewer
by deivid
Wed Nov 12, 2014 4:44 am
Forum: Camera board
Topic: Streaming video with SimpleCV - OpenCV processing
Replies: 5
Views: 4509

Re: Streaming video with SimpleCV - OpenCV processing

You can use the hardware encoder for jpeg to make things faster, there's an example somewhere
by deivid
Sun Nov 09, 2014 4:27 pm
Forum: Graphics, sound and multimedia
Topic: Preferable Wireless Microphone?
Replies: 2
Views: 813

Re: Preferable Wireless Microphone?

java wrote:So far for me, the best solution has been to use a Blue Tooth dongle to connect a Cellphone Bluetooth "earpiece/microphone" device to my Pi ...
This is what I'm doing for now, seeing as how the "standard wireless microphones" that use a 9v battery eat through it in 3 hours.
by deivid
Fri Nov 07, 2014 5:58 pm
Forum: Graphics, sound and multimedia
Topic: Interactive video with RPi and sensors
Replies: 1
Views: 606

Re: Interactive video with RPi and sensors

split your video back to 130 images.
load them all in memory (you have more than enough memory to do this)
display them when convenient
by deivid
Thu Nov 06, 2014 3:38 am
Forum: Graphics, sound and multimedia
Topic: Optimized libpng?
Replies: 3
Views: 970

Optimized libpng?

I thought about trying to implement the mmal png en/decode examples on libpng as a weekend(or more) project. Has anyone thought about this or something similar? googling libpng raspberry pi doesn't give me much. Is it worth it (performance gains vs time to implement) ? In one of the things I'm doing...

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