[mythtv] Mythbackend stuffs up if no video signal is present

Ron Aldrich raldrich at mac.com
Thu May 8 23:02:06 EDT 2003


Over the past couple of weeks, I've been trying to track down an 
intermittent lockup where Mythbackend stuffs up in 
RequestRingBufferBlock, causing Mythfrontend to lock up waiting for 

It turns out that after my RCA DSS receiver sits long enough, it takes 
it upon itself to turn off the video - then, then next time I select 
'Watch TV', in Mythfrontend, it locks up (before opening the video 
window) because there is no video (I'm currently testing a temporary 
fix for this where I issue an 'on' code in RCA.pl before each channel 

I should mention that I'm using a PVR-350 card for my video input - the 
ivtv drivers don't generate an output stream unless there is a video 

I'm not sure what the right solution is for this - I'd like to see a 
"no video signal detected" screen in Mythfrontend, but I'm not sure 
where it should be generated.  Ivtv could generate it, but then ivtv 
would have to be localizable, and Mythbackend would have no way to know 
whether or not it is receiving a valid data stream.  I'm thinking that 
ivtv should report I/O errors, and mythbackend should then fabricate an 
appropriate data stream for Mythfrontend.


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