Motion - Bug Report 2009x 11x 09x 173552
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BUG: multiple cameras

I am trying to use 3 webcams. 1 works. the other 2 give me these errors respectively:

mmap information: 
[1] frames=4 
[1] 0 length=32768 
[1] 1 length=32768 
[1] 2 length=32768 
[1] 3 length=32768 
[1] Using V4L2
[1] Resizing pre_capture buffer to 1 items Corrupt JPEG data: premature end of data segment 
[1] mjpegtoyuv420p: Corrupt image ... continue Corrupt JPEG data: premature end of data segment 
[1] mjpegtoyuv420p: Corrupt image ... continue 
and lastly:
Supported palettes: 
[1] 0: GRBG (GRBG) 
[1] Unable to find a compatible palette format. 
[1] Using VIDEO_PALETTE_YUV420P palette 
[1] Using V4L1 
[1] Resizing pre_capture buffer to 1 items 
[1] Started stream webcam server in port 8081 
[1] sync error in proc 2729: 
[1] mcapture error in proc 2729: 
[1] Video device fatal error - Closing video device 
[1] Closing video device /dev/video2 

the 1 working is a newer cam. logitech. the other one ( first output) is a microsoft one. was working before upgrade to 9.10. Actually neither were working . but i re-installed motion and some drivers and the first one works.

the 3rd one is an old logitech one. i can get it work on its own. but never all 3 at the same time. please advise. would love to get this working ....newbie here

Supported palettes:
[1] 0: GRBG (GRBG)
[1] Unable to find a compatible palette format.
[1] Using VIDEO_PALETTE_YUV420P palette
[1] Using V4L1
[1] Resizing pre_capture buffer to 1 items
[1] Started stream webcam server in port 8081
[1] sync error in proc 2729: 
[1] mcapture error in proc 2729: 
[1] Video device fatal error - Closing video device
[1] Closing video device /dev/video2

Environment

Motion version: 3.2.11.1
ffmpeg version:  
Shared libraries: ffmpeg, mysql, postgresql
Server OS: ubuntu 9.10

-- VictorQuarta - 09 Nov 2009

Follow up

Fix record

Hi there's no bug there.

1-. Motion doesn't support all palettes yet , so for not supported palettes you have to use libv4l as it's explained in FAQ:

http://www.lavrsen.dk/foswiki/bin/view/Motion/FrequentlyAskedQuestions#Problems_running_motion_with_ker

http://www.lavrsen.dk/foswiki/bin/view/Motion/FrequentlyAskedQuestions#Most_usual_issues_running_motion

2-. USB Hosts have issues running multiple webcams because bandwidth , so you have to use dedicated USB 2.0 Host

per webcam ( pwc based webcams can share same USB 2.0 hosts ).

http://www.lavrsen.dk/foswiki/bin/view/Motion/FrequentlyAskedQuestions#sync_error_in_proc_xxxx_No_space

-- AngelCarpintero - 15 Nov 2009
Topic revision: r2 - 15 Nov 2009, AngelCarpintero
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