Tag: connections

Video media converter ADVC-110

Bidirectional analog/digital conversion of composite, s-video, and firewire/ilink.

By Grass Valley

http://www.grassvalley.com/products/advc110

20091222_prodctShot_ADVC110.1920x1080.VidRes.png_305_0

Using this device on Mac OS X 10.9, analog video input shows up as a system device. It also works as a firewire video output device.

Input

 

Using Jitter you can get real time input from analog video devices like cameras and VCR’s. Here’s an example using jit.grab (Max help file) to get input from an analog camcorder.

Screen Shot 2015-04-22 at 8.48.35 PM

 

Output

Sending output via firewire to a TV using jit.qt.videoout (Jitter tutorial 22):

Screen Shot 2015-04-22 at 9.53.39 PM

This is what it looks like on a TV:

tv-out2

Max Twitter client using ruby

Send and receive Tweets using Max via OSC to a background ruby server.

An advantage of this method is that both the patch and the server are  compact and easy to understand. The Max patch does things in a Max way. And likewise with the ruby scripts.

download

https://github.com/tkzic/internet-sensors

folder: twitter-ruby

files

Max
  • twitter-client.maxpat
ruby
  • twitter-server-send.rb (for sending Tweets)
  • twitter-server-get.rb (for receiving Tweets)
ruby gems

The ruby script requires installation of the following gems

  • json
  • osc-ruby
  • twitter

For example:

# sudo gem install twitter


Twitter authorization

In addition to having a Twitter account, you will need to set up a Twitter application from the developer site here:

https://dev.twitter.com/apps

Good instructions on how to do this can be found in this stackoverflow.com post under this heading: So you want to use the Twitter v1.1 API?

http://stackoverflow.com/questions/12916539/simplest-php-example-for-retrieving-user-timeline-with-twitter-api-version-1-1

When you get to step 5 – in the instructions – instead of writing your own code, just use a text editor to copy your access tokens into these ruby programs:

  • twitter-server-send.rb
  • twitter-server-get.rb

Replace the strings in this line of code by copying and pasting the appropriate ones from your Twitter application:

twitterClient = Twitter::REST::Client.new do |config|
  config.consumer_key = "mqQtoYh16343tDFG3BK7QQ"       
  config.consumer_secret = "X0KexjlK49fhhrnn9EztapZfATCQqWCc5fXVJH2pE"      
  config.oauth_token = "205589709-5krgh9FR3KkLGRDnewiU7GKKBMA6i2La84c"       
  config.oauth_token_secret = "LNARAeooN2vkklkF006GRdihQ5D8YYkm8dYvEs68M"  
end
Yeah – its cryptic, but trivial compared to writing the ouath code. Just a reminder, if even one letter or quote mark, or anything is out of place, the authorization will fail.

instructions

(note: currently running with ruby version 2.0) Display your ruby version by typing: ruby –version

Sending Tweets
  • Open the Max patch: twitter-client.maxpat
  • In a terminal window run the ruby script:
# ./twitter-server-send.rb

  • In the Max patch, type in a Tweet. Press the green button to send. 
  • When you have tweeted enough, end the ruby server program by typing <ctrl-c>
 Receiving Tweets
  • Open the Max patch: twitter-client.maxpat
  • In a terminal window run the ruby script:
  • From Twitter, send a Tweet to the user name embedded in the server
# ./twitter-server-get.rb

Both ruby servers can run at the same time.

What’s next?

  • Parse incoming Tweets into various components
  • Combine the 2 Ruby servers

revision history

  • 5/21/2014 – refactored app names. Added receive server
  • 5/19/2004 – moved to twitter-ruby folder
  • 1/18/2014 – minor fixes to ruby server for current ruby version 2.0
  • 9/7/2013 – uses oauth to communicate directly to Twitter from ruby

data recording

Thoughts on a streaming API project model with Max.

I’ve been trying to come up with generalized methods to handle the class of Max projects which read a stream of data from the Web, and use it to trigger events, for example, sound and graphics.

OSC is generally a good way to get data into Max from Web API’s. One issue with data streams, is that they do not always provide a constant flow. In some cases, this is what makes them musical. The rhythm of the flow becomes the rhythm of the music.

But in some cases we are vexed by too little flow or too much.

When the flow is too sparse, and the project requires a constant flow – the stream can be fattened up by using a [metro] object to output the current stream value at a higher frequency.

When the flow is too fast – you can use [speedlim] for numbers – but not for text data like tweets about cats, which seem to stream in like a flood. One solution is to use a data-recorder, like our modified CNMAT list recorder in the Irish Train project.

You would need separate access to the record and play ‘heads’ – so for example you could record in real time, but start playing back at a slower rate (while the recording continues). This is essentially a form of stream buffering. The data recorder approach would also allow you to use various algorithms to ‘thin’ the data – for example, to keep up with the real time rate, but by using less of the data.

[update] got this working with the modified CNMAT data recorder patch. It allows separate control of recording and playback, simultaneously.

patch is in tkzic/max teaching examples/ data-recorder-tester.maxpat

 

Google+ hangouts studio mode

(update)  The studio mode option in Hangouts only appears on the settings menu after you have checked ‘hangouts on air’ and then actually started the Hangout. Only then can you goto settings (gear icon) and select studio mode.

Uses the Celt codec: http://support.google.com/plus/bin/answer.py?hl=en&answer=2664557

GOOGLE+ HANGOUTS ON AIR: AUDIO SETUP GUIDE FOR STUDIO MODE

By David Santy Music

http://davidsantymusic.com/hangouts-on-air-studio-mode-audio-guide/

how to open, read, and write from a serial port in C (linux)

With applications for Raspberry Pi

notes

by hobbytronics.com

http://www.hobbytronics.co.uk/raspberry-pi-serial-port

C – programming example:

http://stackoverflow.com/questions/6947413/how-to-open-read-and-write-from-serial-port-in-c

An R-Pi thread about connecting Arduino to R-Pi. R-Pi does TTL (3.3 v level and Arduino is rs-232 5v) so you need a level converter for them to communicate.

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=31&t=23873

Another similar example, connecting Arduino and R-pi via USB

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=32&t=28801

The WiringPi library for serial io:

https://projects.drogon.net/raspberry-pi/wiringpi/serial-library/