[mythtv-users] Backend drops frames at start of recording; add RAM?

Brian Wood beww at beww.org
Thu May 11 17:38:40 EDT 2006


On May 11, 2006, at 3:01 PM, kanetse at gmail.com wrote:

>> On May 11, 2006, at 2:36 PM, kanetse at gmail.com wrote:
>>
>> You can check to see if it is having to hit swap by monitoring it
>> when the problem seems to be happening.
>>
>> Free, top, vmstat and a host of other programs can help to tell you
>> what's happening.
>>
>> I doubt that swapping to disk would cause delays on the order of what
>> you mention though, I'd have a look at your disk subsystem, check
>> that DMA is enabled, make sure you;re not trying to store on a USB
>> 1.1 drive etc., thugh to be honest even that sort of trouble
>> shouldn't cause delays of a minute.
>
> DMA is definitely enabled; no USB 1.1 devices around...
>
> I will put in a cronjob to log the output of free, top, vmstat, etc.
> at the top of every hour (during primetime, when I'm most likely to be
> using 3 tuners simultaneously), and see what comes back.
>
> But I'm not exaggerating about the 30s-1min delay.  Apparently at the
> start of last night's episode of Lost, a character (Ana-Lucia) came
> into the scene, said a few lines, and then left the scene; and there
> wasn't a single frame of that character recorded.  All I saw was what
> came before, a few split seconds of garbled pictures, and then the
> scene afterwards. I didn't even know what I missed until I read the
> episode review online.

Sounds like it's making clean edits at least. Are you sure you don't  
have the "remove inane dialog" flag enabled ??


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