[mythtv-users] MythTV, seeking ahead / behind, NFS, and bandwidth usage

Blammo[doh] blammo at dohboys.com
Sun Aug 1 22:33:04 EDT 2004

Great clarification, zero help.

>From what I can tell, seeking is the "normal" and preferred behavior, and
assumes it's running from the local HD.

FWIW, "jumping" is no faster. It hit the "jump" button and it sits for 20-30
seconds maybe longer before coming back 10 minutes ahead of where it was
before. Something is still IO or configuration  bound.


----- Original Message ----- 
From: "Isaac Richards" <ijr at po.cwru.edu>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Sent: Sunday, August 01, 2004 2:16 PM
Subject: Re: [mythtv-users] MythTV, seeking ahead / behind, NFS,and
bandwidth usage

> On Sunday 01 August 2004 04:40 pm, Blammo[doh] wrote:
> > Two machines in this cluster, both Athlon XP 2400's, plenty of ram, both
> > running KnoppMyth R4V4, one backend with two PVR-250's, and a frontend
> > Nvidia card hooked together on a 100M cisco switch. /myth mounted over
> > from the backend.
> >
> > Problem:
> >
> > When seeking forward / backward in MPEG2 streams, from recorded TV, I
> > to be running out of ethernet bandwidth. I don't notice this AT ALL in
> > "Video" section with mplayer, just in the TV section. Anything over say
> > seems to have diminishing returns. All the way up at 8x or 16x, checking
> > the switchports shows about 50 - 60meg of traffic running. The load on
> > backend seems to be pretty low, as does the load on the front end. It
> > seems like the frontend isn't getting data fast enough.
> >
> > It appears to me, that the frontend has to read the whole file, to seek
> > ahead / behind in the file, at 1x, 1.5x 2x etc faster. It doesn't appear
> > "seek" or "jump" at all ahead, rather reading the whole thing.
> >
> > I'm just wondering if anyone else has run into this, and what they did
> > fix it. Obviously transcoding to a low bit-rate MPEG4 would help. It
> > me wonder whether the front end couldn't be a little smarter about the
> > reading, take less NFS bandwidth in the process. After all, mplayer has
> > trouble skipping ahead, etc.
> >
> > Thoughts?
> You're confusing fast-forwarding (what you are doing) with seeking (what
> want to be doing).
> Isaac
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