[robocup-small] problems with SSL Vision :/

[Angelo Gurzoni Jr]

Bernhard, hello

I believe most teams use Ubuntu (we're using version 10.10). Try to set your
camera to RAW8 mode, and make sure the 2 cameras are not on the same bus

 

Also, from your camera's datasheet, it seems you can only get 53 fps even in
RAW8:

Marlin F046 datasheet:  Frame rates:  Up to 53 Hz in Format_7; up to 53 Hz
in Format_7 Raw8; 36 Hz(YUV 4:2:2); 49 Hz (YUV 4:1:1); 21 Hz (RGB8)

 

An approximate math on the bandwidth required is camera's h_resolution X
v_resolution X bits_per_packet X fps

bits_per_packet for RAW8 = 8 bits and for YUV422 = 16 (or was it some
variable number..? But larger than 8 for sure) 

 

** I believe you also need to increase your result by +/- 20% to account for
the headers and comm. Control.

 

 

 

 

 

Cheers

Angelo

 

From: robocup-small-bounces at cc.gatech.edu
[mailto:robocup-small-bounces at cc.gatech.edu] On Behalf Of Bernhard Perun
Sent: Wednesday, April 06, 2011 11:32 AM
To: robocup-small at cc.gatech.edu
Subject: [robocup-small] problems with SSL Vision :/

 

Hey guys,

at the moment we want to configure our two AVT Marlin F046C cams in SSL
Vision, so that we can use them with the highest framerate possible.

Unfortunatelly we're experiencing a lot of problems letting SSL Vision run
with these two cams.

Our settings:
- OS: Debian 6.0
- SSL-Vision mode: YUV422
- One Delock Express Card - 34 Firewire card (notebook) / One WinTech
Controller Card (VIA 6306 Chipset) (desktop pc)

The SSL-Vision errors we've got:
1. The unpatched version of SSL Vision is running with one cam only (max 25
frames). If we want to start the second one, we will get the error: Could
not allocate ISO channel (should be a known issue)
2. With a patched version (divide the bandwidth by two) of SSL Vision our
two cams are working with only max. 18 frames each.

Do you have any experience with these kind of problems or can you answer
these questions, please:

- What kind of Linux/libdc1394 do you use?
- Which SSL-Vision settings (Raw8, YUV422, ...) do you use?
- What kind of firewire card do you use and how many cams per card (one or
two)?
- Do you have any clues to get SSL Vision running successfully?

Thank you very much for your help!

Regards,

Bernhard Perun
Project leader "Tigers Mannheim"
Cooperative State University Baden-Wuerttemberg
Coblitzallee 1-9
68163 Mannheim
E-Mail: bernhard.perun at googlemail.com
Internet: www.tigers-mannheim.de

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