Jumpy Video

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Pastor Dave

New Member
OBS fed by ATEM Mini and Canon SL2 OES SLR works well through my personal Windows 10 computer. However the same setup on a new similarly powered computer will not work. The video is terrible - slashed and jumpy - no sync. Several minor changes have been made after putting the log through analysis but nothing has repaired the video. Comparisons of the logs of two computers are very similar until the line "warning: mjpeg_decode_dc: bad vic: 0:0 (0000023B0813B188)." Hope you may have some suggestions.
Log file:
 
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Tomasz Góral

Active Member
Sequence connection, check run OBS, connect ATEM and vice versa.

But of course mjpeg_decode_dc this problem say: something wrong with USB bandwidth.
When lost connection on bus not all data transfered and jpeg can't be decoded and played.
 
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Pastor Dave

New Member
Done a lot of testing with User Benchmark and USBDeview but have not noticed anything bad. Can you suggest what I might do to correct "mjpeg_decode_dc: bad vic" ?
 
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Pastor Dave

New Member
Tomasz, thank you for you kindness in responding to my post. I have spent excessive hours tracking down every possible answer to "why the jitters making such a foul display." Many thought the problem was in the USB cables. That my same cables work flawlessly on another computer with OBS and ATEM say no. I found several other contributors that agreed.
This has been a problem that OBS and Blackmagic have known about for months though neither are anxious to acknowledge it. Others have written "there is currently NO solution, an affected machine is simply incompatible with ATEM Mini switchers."
To keep my sanity, the one solution is to recognize that there is no solution except to not use this problem computer with the ATEM. It's fine for other uses - probably an excellent gamer if that was of interest, but I cannot expect it to ever work with OBS and an ATEM Mini.
Again, thank you for your suggestions, but it is time to put the cards on the table: an occasional computer will not work with OBS and the ATEM Mini.
 
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konsolenritter

Active Member
Pastor Dave said:
There is no apparent difference when connected to USB3 or USB2. The only other USB use is mouse and keyboard.
Click to expand...

Just to add my humble opinion: I think that what you said is the key: Connecting by USB2 should have been worsen the thing, definitely. Given by physics there should be a great difference between connections by USB2 and USB3. So this sounds to be an issue with USB2, really (whatever the reason is). You may have a look into the BIOS for crucial "compatibility modes" regarding USB or something alike. And as Tomasz suggested, an active usb-3 hub in between (bridging, so that "someone else" talks directly to the laptops port) may help.
 
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