[mythtv] RE: End of recording when not at the end

[Colin Cross]

After some distraction setting up a second backend to debug on, I've 
tracked down the problem I was having with live recording playback 
ending prematurely.  The problem is that the timeout in 
RingBuffer:safe_read is 0.9 seconds, which is shorter than the 1 second 
write period in RingBuffer:DiskLoop.  If I skip to near the end of a 
live recording, say within 10 seconds, zerocnt ends up as high as 21 at 
the end of safe_read (after I increased the safe_read zerocnt limit to 
50 for normalfiles).  The attached one-line patch changes zerocnt to 30 
for a timeout of 1.8 seconds, which is almost double the write period.  
Is there something else I'm missing that is supposed to prevent the 
RingBuffer from trying to read so close to the end?
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