Veejay/motion/EffecTV MINI-HOWTO
Niels Elburg ( nielselburg at yahoo.de )David Denny ( david at yaravi.com )
v1.0, 15 May 2003
This document describes how to start up a veejay session with input from a webcam running through motion and EffecTV.
- 1.1 Disclaimer
- 1.3 Audience and Intent
- 1.2 Acknowledgements
- 1.4 Revision History
- 1.5 New versions of this document
- 1.6 Feedback
- 1.7 Distribution Policy
- 7.1Websites
- 7.2Mailing Lists
1. Introduction
Veejay is a video tracker/editing and live performance tool for Linux.
It provides a graphical interface for video editing and mixing as well
as a keyboard interface for direct user interaction (in a performance
environment).
This document shows an example about streaming (live) video using motion and EffecTV with veejay
by using vloopback pipes.
Using multiple video4linux devices is not yet covered here, but starting it would be relativly simple
once understanding how veejay streams from various sources.
1.1 Disclaimer
No liability for the contents of this documents can be accepted. Use the concepts, examples and other
content at your own risk. As this is a new edition of this document, there may be errors and inaccuracies, that may of course be damaging to your system. Proceed with caution, and although this is highly unlikely, the authors do not take any responsibility for that.
All copyrights are held by their respective owners, unless specifically noted otherwise. Use of a term in
this document should not be regarded as affecting the validity of any trademark or service mark.
Naming of particular products or brands should not be seen as endorsements.
You are strongly recommended to take a backup of your system before major installation and backups at regular intervals.
1.2 Audience and Intent
This document is targeted at the Linux user interested in experimenting with streaming video using multiple programs.
1.3 Acknowledgements
The following people have been helpful in getting this HOWTO done:
1.4 Revision History
Version 1.0
- First version for public release
1.5 New versions of this document
You will find the most recent version of this document at veejay.sourceforge.net/mini_howto.html.
If you make a translation of this document into another langauge, let us know and we'll include a reference to it here.
1.6 Feedback
We rely on you, the reader, to make this HOWTO usefull. If you have any suggestions, corrections , or comments , please
send them to us ( veejay-users@lists.sourceforge.net ), and we will try to incorporate
them in the next revision. Please add 'HOWTO veejay' to the Subject-line of the mail.
Before sending bug reports or questions, please read all of the information in this HOWTO, and send detailed information about the problem.
If you publish this document on a CD-ROM or in hardcopy form, a complimentary copy would be appreciated. Mail us for our postal address.
Also consider making a donation to the Veejay Project to help support free video editing software in the future.
1.7 Distribution Policy
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts , and with no Back-Cover Texts. A copy of this license is included in the section entitled "GNU Free Documentation License".
2. About streaming with veejay, motion and EffecTV
This is a useful setup because with the webcam you have a source where
you can generate detectable movement, using motion you can create the
detection and plain streams, and with effectv is it easy to switch effects
using just the cursor arrows and see what happens in veejay's effectors.
3. What is needed
You will need the patched vloopback that comes with EffecTV (or veejay)
and a patched EffecTV from the veejay website. This EffecTV uses a simpler
communication with vloopback devices (and is slower).
4. Running multiple sessions
The way I run these is from console with multiple sessions. this way I can remember where to restart etc, if you are interested my console contains the following sessions.
- root session to start, stop and check motion;
- user session, first invocation of effectv (live cam feed into veejay stream at tag 1);
- user session, second invocation of effectv (detection cam feed into veejay stream at tag 2);
- user session, veejay console;
- user session, third invocaton of effectv (veejay feed from output vloopback);
- user midnight commander session set at ~/.veejay - to be able to kill the dump file in the event of wanting to restart veejay *;
Start only one veejay with the -g parameter to use the graphical interface gveejay. * You can specify the -o parameter to specify a location for the dump file
5. Getting started
Right off you go.
1. Webcam. I assume this is running as /dev/video0.
2. As root:
2a. load the vloopback module with:
modprobe vloopback dev_offset=2 pipes=7 |
$ cat /proc/video/vloopback/vloopbacks |
The output should look like this:
vloopback version 0.90 Loop Input Status Output Status 0 video2 - video3 - 1 video4 - video5 - 2 video6 - video7 - 3 video8 - video9 - 4 video10 - video11 - 5 video12 - video13 - 6 video14 - video15 - |
3. Setup motion.conf with the following entries:
videodevice /dev/video0 # this is the webcam |
3b. Start motion. you should see video4 and video6 with W flags in the vloopback directory:
vloopback version 0.90 Loop Input Status Output Status 0 video2 - video3 - 1 video4 W video5 - 2 video6 W video7 - 3 video8 - video9 - 4 video10 - video11 - 5 video12 - video13 - 6 video14 - video15 - |
4. the rest as your home user.
4a. start two Effectv processes with:
$ effectv -device /dev/video5 -vloopback /dev/video8 $ effectv -device /dev/video7 -vloopback /dev/video10 |
4b. 4b. check the vloopbacks file again, you should now see 'R' entries for video5/7 (the output ends of the video4/6 pipes) and W entries for video8/10:
vloopback version 0.90 Loop Input Status Output Status 0 video2 - video3 - 1 video4 W video5 R 2 video6 W video7 R 3 video8 W video9 - 4 video10 W video11 - 5 video12 - video13 - 6 video14 - video15 - |
You should now have your two Effectv SDL windows open; with one of these these focussed. scroll through the various effects using the cursor arrow up and down keys.
Right, now you are ready to start veejay. I put the parakeet movie into ~/testavi/ and if you do the same the next command will work.
4c. start veejay with:
$ veejay -a0 -n2 -v1 -g ~/testavi/parakeet.avi |
4d. when the SDL screen opens, put the mouse in it and key as follows:
|
4e. put cursor back in x terminal where veejay is running and type the loopback input command li 3
It will tell you it's reading /dev/video9.
4f.Move the mouse back to the SDL (where the mad parrot is).
|
4g put cursor back in x terminal where veejay is running and type the loopback input command li 4
It will tell you it's reading /dev/video11.
4hMove the mouse back to the SDL (where your webcam stream is playing)
|
4i. Now make sure you can stop and start each of the webcam streams - you are in the green one at present.
Press INSERT to stop it, and INSERT to restart it
F1 switch to live stream, running, INSERT to stop and INSERT to restart |
Nothing should hang or crash, if it does then it's worth reporting.
4j. start an output vloopback, mouse to console window and type:
$> lo 0 |
It will confirm it's outputting to /dev/video2
you can now pick this up on the other end of the pipe by typing
$ effectv -device /dev/video3 |
RIGHT! now you have four windows:
- live feed to Effectv
- motion feed to Effectv
- veejay
- veejay output
6. The results
If you focus on each in turn you can experiment with effects.
I would suggest to start with the following settings:
first SDL (live feed) - focus window, the title is DumbTV, two hits of
the cursor up arrow give you BrokenTV like in the image below:
second SDL(motion) - focus window, from DumbTV, twelve hits of the
cursor up arrow give you RippleTV
third SDL (veejay) - use F1, INSERT, F2, INSERT, slash, ESC, to switch
between the effected webcam/motion streams and the mad parakeet, and you can
use a,s,d,f,g,h,j,k,l to set the mad parakeet speed from 0 to 9; if it seems to
have stopped, while looking at the parakeet, use F1 to restart it, or
the num keypad keys 1-9 for navigation. And to loop the mad bird, end to
end or ping pong modes, use the numpad asterisk to change mode.
fourth SDL(veejay output) allows you to pick up any of the above and
verify that veejay is working correctly. I have it set to CycleTV
(thirteen hits of the cursor up arrow) for an un-effected veejay, just to
verify the channels are working correctly. However you should set it back
to DumbTV (just keep pressing the cursor down arrow till you get there)
if you are going to play with veejay's effects (or you combine veejay and effectv
with one of the video effects), which comes next.
This bit is fairly basic as I have not got too far experimenting with
overlaying effects and it's frankly easier with gveejay, however just to
get a taster:
focus the third SDL window, the veejay one, and press the END key,
check the console, it should say "Enabled Effect Chain" - if there is no
response then focus the console and hit enter and then go back to the
veejay SDL and press END again - which toggles Enabled and Disabled. Now,
to see the veejay effectors, focus on the veejay SDL, use the up and
down arrows to scroll through the effects list (which will be displayed
on the veejay console), and use Return to activate an effect. See the
result in the fourth SDL.
Depending on which Effect you select, there is a number 0 or more parameters.
|
You can stop reading here and start experimenting with various effectors.
Resources
7.1 Websites
7.2 Mailing Lists
There is a mailing list for veejay which is hosted by Sourceforge. The address is veejay-users@lists.sourceforge.net
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