Search found 46 matches
- Mon Jul 10, 2017 12:02 am
- Forum: Advanced users
- Topic: Raspberry boots with 0 audio channels on hdmi
- Replies: 0
- Views: 402
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...
- Sat Jul 08, 2017 11:33 pm
- Forum: Advanced users
- Topic: framebuffer/tty is smaller than physical screen
- Replies: 1
- Views: 688
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...
- Sat May 23, 2015 5:45 am
- Forum: General discussion
- Topic: WebRTC V8/WebM
- Replies: 9
- Views: 10006
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 ...
- Fri May 22, 2015 9:24 pm
- Forum: Camera board
- Topic: CBR raspivid ffmpeg
- Replies: 12
- Views: 2808
Re: CBR raspivid ffmpeg
the -b (bandwidth) option will do what you want, set a constant bitrate
- Fri May 22, 2015 8:44 pm
- Forum: Camera board
- Topic: New camera+Rpi2 - No data received from sensor
- Replies: 0
- Views: 1327
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...
- Tue May 12, 2015 7:16 am
- Forum: Advanced users
- Topic: [Guide] Pulseaudio 5 on Wheezy
- Replies: 143
- Views: 112963
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: libpu...
- Tue Apr 14, 2015 4:39 am
- Forum: Other projects
- Topic: Audio over SSH
- Replies: 1
- Views: 709
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...
- Sun Apr 05, 2015 12:38 am
- Forum: Graphics, sound and multimedia
- Topic: Outputting wav file directly to jack/pwm pin
- Replies: 2
- Views: 850
Re: Outputting wav file directly to jack/pwm pin
lots of players can read from pipes. just read/write to a pipe
- Sun Apr 05, 2015 12:07 am
- Forum: Networking and servers
- Topic: Is this feasible? (Solar Powered Server)
- Replies: 2
- Views: 1081
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 ...
- Thu Mar 19, 2015 4:26 pm
- Forum: Camera board
- Topic: Ultraviolet light with NOIR camera
- Replies: 17
- Views: 14882
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...
- Thu Mar 19, 2015 3:16 am
- Forum: Camera board
- Topic: Ultraviolet light with NOIR camera
- Replies: 17
- Views: 14882
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
Where did you order the UV pass filter? I have a hard time getting them locally. I'll order a set ASAP
- Thu Mar 12, 2015 9:59 pm
- Forum: Camera board
- Topic: Ultraviolet light with NOIR camera
- Replies: 17
- Views: 14882
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...
- Wed Dec 10, 2014 4:31 am
- Forum: Graphics, sound and multimedia
- Topic: using jack/alsa for streaming audio
- Replies: 4
- Views: 3391
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),...
- Fri Dec 05, 2014 6:42 pm
- Forum: Graphics, sound and multimedia
- Topic: Board w/ Camera & Transmitter
- Replies: 2
- Views: 936
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
Software side: ffmpeg with rtp
- Fri Dec 05, 2014 6:05 pm
- Forum: Graphics, sound and multimedia
- Topic: alsaloop usage
- Replies: 6
- Views: 7308
Re: alsaloop usage
try
arecord -Dhw:1,0 | aplay -Dhw:1,0
- Tue Dec 02, 2014 11:02 pm
- Forum: Camera board
- Topic: Change ROI Live (and crop instead of stretch)
- Replies: 5
- Views: 1878
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
- Mon Dec 01, 2014 2:53 pm
- Forum: Camera board
- Topic: Change ROI Live (and crop instead of stretch)
- Replies: 5
- Views: 1878
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 ...
- Sun Nov 16, 2014 6:33 am
- Forum: Camera board
- Topic: RaspberryPi Camera for Astrophotography
- Replies: 345
- Views: 121156
Re: RaspberryPi Camera for Astrophotography
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 skingordon77 wrote:noir[...]
- Wed Nov 12, 2014 9:30 pm
- Forum: General discussion
- Topic: New RPI model A+ Q&A Thread
- Replies: 55
- Views: 20768
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...
- Wed Nov 12, 2014 5:53 am
- Forum: C/C++
- Topic: Problem with framebuffer based SDL program
- Replies: 0
- Views: 494
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 ...
- Wed Nov 12, 2014 5:51 am
- Forum: Graphics programming
- Topic: Programmically controlling FBI or another image viewer
- Replies: 4
- Views: 4004
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
https://github.com/DavidVentura/sdl-image-viewer
- Wed Nov 12, 2014 4:44 am
- Forum: Camera board
- Topic: Streaming video with SimpleCV - OpenCV processing
- Replies: 5
- Views: 4821
Re: Streaming video with SimpleCV - OpenCV processing
You can use the hardware encoder for jpeg to make things faster, there's an example somewhere
- Sun Nov 09, 2014 4:27 pm
- Forum: Graphics, sound and multimedia
- Topic: Preferable Wireless Microphone?
- Replies: 2
- Views: 922
Re: Preferable Wireless Microphone?
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.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 ...
- Fri Nov 07, 2014 5:58 pm
- Forum: Graphics, sound and multimedia
- Topic: Interactive video with RPi and sensors
- Replies: 1
- Views: 735
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
load them all in memory (you have more than enough memory to do this)
display them when convenient
- Thu Nov 06, 2014 3:38 am
- Forum: Graphics, sound and multimedia
- Topic: Optimized libpng?
- Replies: 3
- Views: 1160
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...