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by towolf
Sun Aug 16, 2015 5:27 pm
Forum: Camera board
Topic: Streaming audio and video
Replies: 14
Views: 3247

Re: Streaming audio and video

I would ask the Raspbian developers why rpicamsrc is not found in the repository. It is very useful and developed specifically for the Raspberry Pi. It would only be one apt-get away. I mean, the project even has the appropriate Debian packaging scripts included: https://github.com/thaytan/gst-rpic...
by towolf
Sun Aug 16, 2015 5:15 pm
Forum: Camera board
Topic: Streaming audio and video
Replies: 14
Views: 3247

Re: Streaming audio and video

I expect this would work very well with GStreamer, rpicamsrc, and alsasrc. rpicamsrc uses the MMAL RTC clock timestamps. Muxing this with audio from ALSA should work well. It seems that I am expected to compile the rpicamsrc plugin from source. Whilst I can do that, I feel that most people won't be...
by towolf
Wed Jun 24, 2015 1:10 pm
Forum: Camera board
Topic: Streaming audio and video
Replies: 14
Views: 3247

Re: Streaming audio and video

I expect this would work very well with GStreamer, rpicamsrc, and alsasrc. rpicamsrc uses the MMAL RTC clock timestamps. Muxing this with audio from ALSA should work well.
by towolf
Wed Jun 24, 2015 11:59 am
Forum: Advanced users
Topic: Animated GIF on Framebuffer
Replies: 7
Views: 4865

Re: Animated GIF on Framebuffer

The problem is that the looping of omxplayer is not too solid. Earlier it didn’t work stably, and in more recent builds it trims off some seconds off the end. For seamless gifs this is not good.
by towolf
Tue Jun 23, 2015 12:17 am
Forum: Advanced users
Topic: Animated GIF on Framebuffer
Replies: 7
Views: 4865

Re: Animated GIF on Framebuffer

I want to try this, but my Rpi is running Arch. Any idea which of these packages I need to install? I don’t want to clutter the Rpi too much and install everything root@paitu:~# pacman -Ss qml extra/calligra-gemini 2.9.5-2 (calligra) QML interface for Calligra Words and Stage extra/kdeclarative 5.11...
by towolf
Wed Jun 10, 2015 5:39 pm
Forum: Camera board
Topic: Measuring light levels with camera
Replies: 6
Views: 1910

Re: Measuring light levels with camera

The binary EXIF field in the jpgs contains the Brightness Value. Isn’t that more of a measurement of scene brightness?
by towolf
Wed May 13, 2015 2:15 am
Forum: Camera board
Topic: Trouble streaming video from the Raspberry Pi camera to OS X
Replies: 2
Views: 684

Re: Trouble streaming video from the Raspberry Pi camera to

Yeah that character is in the original link. That should be changed.

Do a find in your original link and search for "dash". There’s multiple people pointing out the problem in the comments.
by towolf
Wed May 13, 2015 2:12 am
Forum: Camera board
Topic: Trouble streaming video from the Raspberry Pi camera to OS X
Replies: 2
Views: 684

Re: Trouble streaming video from the Raspberry Pi camera to

That’s a long "en" dash at the end. A typographic unicode character. It tries to open it as a file with filename '–'.

On the raspivid command line only the normal ascii dash works as a "pipe to standard out" symbol character.

ascii: -
en dash: –
em dash: —
by towolf
Thu Apr 30, 2015 11:24 am
Forum: Raspbian
Topic: Systemd Jessie errors
Replies: 29
Views: 15294

Re: Systemd Jessie errors

ktb, what did you even do to get into this mess? I didn’t have to change anything in /boot/cmdline? Init (pid 1) is transparently replaced by the link /sbin/init -> /lib/systemd/systemd, is it not? I merely dist-upgraded and didn’t have to compile anything. This is my vanilla /boot/cmdline dwc_otg.l...
by towolf
Thu Apr 30, 2015 10:15 am
Forum: Camera board
Topic: Stream from one RPi2 with RPi Camera to another RPi2
Replies: 4
Views: 578

Re: Stream from one RPi2 with RPi Camera to another RPi2

That is what the link I posted is about? On a sending Rpi you launch raspivid or whatever to capture from camera. Then you need some kind of network protocol wrapping (simplest is just netcat, more involved is RTP over UDP with GStreamer). Then on receiving RPi you need a video player. Many are lead...
by towolf
Wed Apr 29, 2015 1:54 pm
Forum: Raspbian
Topic: Systemd Jessie errors
Replies: 29
Views: 15294

Re: Systemd Jessie errors

Ugh, sorry about referencing the concept that describes a self-congratulatory geometry.

On Reddit this has become somewhat a "terminus technicus" for some kind of a cabbalistic echo chamber.

No "attack" intended.
by towolf
Wed Apr 29, 2015 11:18 am
Forum: Raspbian
Topic: Systemd Jessie errors
Replies: 29
Views: 15294

Re: Systemd Jessie errors

[SNIP] Had a mostly unused, vanilla but stripped-down Raspbian wheezy SD card. I didn’t want to try this on my main Rpi "server". I changed s/wheezy/jessie in sources.list and did a dist-upgrade. It asked some questions during the upgrade, but nothing unusual for a dist-upgrade. After reboot it came...
by towolf
Tue Apr 21, 2015 12:52 pm
Forum: Camera board
Topic: Streaming video fom one pi to another over network
Replies: 11
Views: 1833

Re: Streaming video fom one pi to another over network

You need to use hello_video_simple. Not just hello_video. That one plays frames as fast as possible with no regard to timing in the stream. The code dom mentioned in OP is still buried in his private GitHub repo. You can download those 5 files and move them to new folder /opt/vc/src/hello_pi/hello_v...
by towolf
Mon Apr 20, 2015 10:32 am
Forum: Camera board
Topic: Stream from one RPi2 with RPi Camera to another RPi2
Replies: 4
Views: 578

Re: Stream from one RPi2 with RPi Camera to another RPi2

viewtopic.php?f=43&t=93330

This variant of the demo hello_video tool is supposed to stream with low latency.
by towolf
Thu Apr 09, 2015 10:30 am
Forum: Troubleshooting
Topic: Video streaming (RPi to windows7) by using GST-RTSP and VLC
Replies: 2
Views: 1441

Re: Video streaming (RPi to windows7) by using GST-RTSP and

Try this tightened setup.

You need to compile gst-rpicam also. rpicamsrc directly provides video. Where you think you are piping video, you aren’t ( | ./test-launch). The problem of buffering on the receiving side has to be solved somehow. Dunno how to do that for VLC.
by towolf
Wed Mar 25, 2015 1:28 pm
Forum: Camera board
Topic: Simple h.264 HLS Server, audio too
Replies: 6
Views: 11340

Re: Simple h.264 HLS Server, audio too

Remove "-map 1:0"

You also don’t need "psips" anymore. Just add --inline to the raspivid command.
by towolf
Wed Mar 18, 2015 2:41 pm
Forum: Camera board
Topic: Problem streaming to Windows with Gstreamer SDK
Replies: 22
Views: 8641

Re: Problem streaming to Windows with Gstreamer SDK

Another thing you can do is compile gst-rtsp-server, and use the examples/test-launch utility to make your camera available as an RTSP stream: ./examples/test-launch "( rpicamsrc bitrate=3000000 hflip=true vflip=true ! video/x-h264,width=1280,height=720,framerate=15/1 ! h264parse ! rtph264pay confi...
by towolf
Wed Mar 11, 2015 4:27 pm
Forum: Camera board
Topic: Problem streaming to Windows with Gstreamer SDK
Replies: 22
Views: 8641

Re: Problem streaming to Windows with Gstreamer SDK

-v just enables verbose logging. That can’t be it. For me this sender and receiver gives me around 100ms of latency. But my receiver is Linux as well. Sender gst-launch-1.0 -e rpicamsrc bitrate=5000000 do-timestamp=true preview=false ! 'video/x-h264,width=1024,height=768,framerate=30/1' ! h264parse ...
by towolf
Wed Mar 11, 2015 10:53 am
Forum: Camera board
Topic: Problem streaming to Windows with Gstreamer SDK
Replies: 22
Views: 8641

Re: Problem streaming to Windows with Gstreamer SDK

It might be that the receiving side needs to be started first, so that it can catch the start of the stream.

Can you post the commands you are using on both ends?
by towolf
Mon Mar 02, 2015 11:59 am
Forum: Camera board
Topic: .HELP. Camera Stream
Replies: 4
Views: 1148

Re: .HELP. Camera Stream

Got a fairly low latency (200-500ms) demo running using WebRTC. WebRTC is the new cross-browser standard for Skype-like communication without plugins. Problem is codecs. For some weird political reason Firefox supports H.264, but Chrome does not (yet). Needs a WebRTC messaging server, for which I op...
by towolf
Sat Feb 14, 2015 2:19 pm
Forum: Camera board
Topic: Night mode: video is dark - image is bright?
Replies: 4
Views: 1159

Re: Night mode: video is dark - image is bright?

You can also set --framerate 0. Then FPS will be completely variable with a max of 30. This is problematic when you write an .h264 file, since it will make a variable speed video. But for network streaming or muxing into container that supports variable frame rates it works fine.
by towolf
Sat Feb 14, 2015 2:12 pm
Forum: Camera board
Topic: Images progressively blurry as the day goes on
Replies: 22
Views: 1847

Re: Images progressively blurry as the day goes on

I can only say that I observed this too when I did day and night timelapses. When it got really bright during the day the image got fuzzy.
by towolf
Thu Feb 12, 2015 11:20 pm
Forum: Camera board
Topic: Annotate, any hope for future changes?
Replies: 109
Views: 8342

Re: Annotate, any hope for future changes?

If I remove --irefresh I get 5-6 frames of latency on the network stream. I thought the effect would be opposite?
by towolf
Thu Feb 12, 2015 11:16 pm
Forum: Camera board
Topic: Annotate, any hope for future changes?
Replies: 109
Views: 8342

Re: Annotate, any hope for future changes?

Thanks a lot for --annotate in raspivid. With it I can finally get a grip on the real latency. Having an RTP network stream with a frame counter just filming the screen "hall of mirrors" style, I count 6 to 7 frames of latency at 60fps, which is 100 to 116ms. http://i.imgur.com/qAP0NGy.png About the...
by towolf
Thu Feb 12, 2015 6:32 pm
Forum: General discussion
Topic: Raspberry Pi + WebRTC
Replies: 9
Views: 5244

Re: Raspberry Pi + WebRTC

Got a simple demo working. Posted description in other thread.

Now to strip down the demo to remove extraneous HTML from Janus default page.

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