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[Dave Pusey <dave@xxxxxxxxxxxxx>]

Following up on my previous comment, i have removed the patch from my
mythfrontend.sh file, but a command line switch to override this feature
for those like myself who need multiple processes would be a good idea.

-- 
multiple instances on one box undesirable
https://bugs.launchpad.net/bugs/352077
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Status in Mythbuntu, Ubuntu derivative focused upon MythTV: Fix Released
Status in “mythtv” package in Ubuntu: Fix Released

Bug description:
MythTV does not restrict the number of instances of mythfrontend which can run simultaneously on the same box. There is no particular reason why one box should run multiple instances simultaneously and this can inadvertently lead to symptoms like the sound disappearing and performance degradation. 

The script or binary which mythfrontend runs should first check to see if the process already exists and refuse to continue if it does.

Version installed: 0.21.0+fixes18722-0ubuntu1
OS Description: Ubuntu 8.10 (Release: 8.10)

Because MythTV is typically installed on a desktop OS, it is possible for users to inadvertently trigger multiple instances; some report this happening because of scripts associated with remote buttons. Rather than fix button scripts, the process should monitor itself -- unless there's some reason why it would be desirable for a single box to run multiple instances of the frontend. Again, I'm not talking about preventing multiple frontends running on multiple boxes, just limiting each box to one instance each of the frontend.