Difference between revisions of "Raspberry Pi - Week 4"
From Robert-Depot
(→Video Playback) |
(→Video Playback) |
||
| Line 9: | Line 9: | ||
*[https://github.com/huceke/omxplayer Omxplayer] is a video player specifically made for the Raspberry PI's GPU made by Edgar (gimli) Hucek from the XBMC project. | *[https://github.com/huceke/omxplayer Omxplayer] is a video player specifically made for the Raspberry PI's GPU made by Edgar (gimli) Hucek from the XBMC project. | ||
**omxplayer comes pre-installed on our raspbian distribution. | **omxplayer comes pre-installed on our raspbian distribution. | ||
| − | + | *Try it out. | |
| − | + | **Copy a movie file to your raspberry pi using scp. The movie needs to be mp4 format. | |
| − | *Try it out | ||
| − | **Copy a movie file to your raspberry pi using scp. | ||
| − | |||
***you can transcode with ffmpeg: | ***you can transcode with ffmpeg: | ||
| − | + | ***<code>ffmpeg -i mouse_brain.wmv mouse_brain.mp4</code> | |
| − | **run omxplayer | + | **run omxplayer: |
***<code>omxplayer ~/Movies/mouse_brain.mp4<code> | ***<code>omxplayer ~/Movies/mouse_brain.mp4<code> | ||
| − | **notice responsiveness. | + | *You can control playback with a number of hotkeys: |
| − | *We | + | **http://elinux.org/Omxplayer#Hotkeys |
| + | **Try these, and notice the responsiveness of the system. Is there any noticable delay? | ||
| + | *We can send hotkeys via STDIN in python: | ||
**http://stackoverflow.com/questions/12755968/sending-arrow-keys-to-popen | **http://stackoverflow.com/questions/12755968/sending-arrow-keys-to-popen | ||
Revision as of 08:03, 26 April 2013
Contents
Review
- Installed software with apt-get. (including festival).
- Installed and ran VNC to get a remote desktop on the machine.
- Ran a simple python script to synthesize speech ( example)
- Another python tutorial: Learn Python the Hard Way
Video Playback
- Omxplayer is a video player specifically made for the Raspberry PI's GPU made by Edgar (gimli) Hucek from the XBMC project.
- omxplayer comes pre-installed on our raspbian distribution.
- Try it out.
- Copy a movie file to your raspberry pi using scp. The movie needs to be mp4 format.
- you can transcode with ffmpeg:
ffmpeg -i mouse_brain.wmv mouse_brain.mp4
- run omxplayer:
omxplayer ~/Movies/mouse_brain.mp4<code>
- Copy a movie file to your raspberry pi using scp. The movie needs to be mp4 format.
- You can control playback with a number of hotkeys:
- http://elinux.org/Omxplayer#Hotkeys
- Try these, and notice the responsiveness of the system. Is there any noticable delay?
- We can send hotkeys via STDIN in python:
ffmpeg
- install homebrew
- <code>brew install ffmpeg
Scripting Video Playback
GPIO
- pin over-voltage protection circuits - http://elinux.org/RPi_Tutorial_EGHS:GPIO_Protection_Circuits
- light example - https://projects.drogon.net/raspberry-pi/gpio-examples/tux-crossing/gpio-examples-1-a-single-led/
- uses wiringPI, command line tool, for ex:
gpio - installed using git - https://projects.drogon.net/raspberry-pi/wiringpi/download-and-install/
- uses wiringPI, command line tool, for ex:
through python
- follow adafruit - http://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/overview
- Rpi.GPIO -
- requires python-dev
- python-rpi.gpio
- https://code.google.com/p/raspberry-gpio-python/
Logic Level Conversion
- RPi is 3.3V.
