[mythtv-users] Commercial Flagging (UK, DVB-T)

[Mark Greenwood]

On 28 Oct 2012, at 01:31, Tim Phipps wrote:

> Quoting Mark Greenwood <fatgerman at gmail.com>:
>> Funnily enough the same thought just occurred to me as this email came in. My storage groups don't have a slash at the end. I'm using a default mythbuntu install, so I didn't create them myself. So it's more likely a mythbuntu bug than an mythtv bug then I guess? When I get a slack minute I'll report it to the mythbuntu guys. I'm loath to change my storage groups now because who knows what else it might break? :)
> 
> Well, there's only one way to find out!
> 
>> BTW once I'd made that change, your script ran and detected commercials successfully on two recordings. The CPU usage on my atom/ION backend was still too high to do flagging during recording (not that I actually tried it, but flagging an existing recording I watched 'top' while it ran and the CPU was maxed.) It's quicker than the mythcommflag_wrapper script but uses more CPU, which is not what I was expecting and I don't think it's what you were expecting either :) Must be something odd going on there. I'll keep investigating.
> 
> When you run this script on an old recording the CPU is going to be the only limit and it will run ffmpeg/avconv at 100% CPU and mausc at whatever it takes to keep up.  If you set it to start when a recording starts it will be throttled by the incoming data rate and will use much less CPU, plus it won't need to read the data from disk because it will almost certainly be in the cache. The system will take less energy and will be done quicker.
> 
> Try it out in a quiet time with a programme you don't care about. You should see the CPU spike at the start and then drop down once things settle into a nice steady flow.

You're right, it worked a treat - about 5% CPU usage from avconv, mausc didn't even register. I'll be using that from now on.

Cheers,

Mark

> 
> Cheers,
> Tim.
> 
> 
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