[mythtv-users] Shuttering video in myth
Fedor Pikus
fpikus at gmail.com
Sun May 29 06:06:24 UTC 2005
I'm mostly done putting together the myth box, but I ran into a
problem I did not expect, not with the hardware I put together: video
playback is stuttering quite badly. It does not happen all the time,
but mostly in these two cases:
1) After I switch channels in live tv, there is a pause (expected),
then it starts playing, pauses, resumes, does it several times, this
lasts for 10-20 seconds, then it starts playing ok.
2) If I pause live tv and then play it after a while, video stutters
and pauses, and it gets worse the longer I wait. If I paused for an
hour, it'll be impossible to watch, it'll halt every few seconds for
half a second, and unlike the case above, there is no end to this.
I'm running FC3, 2.6.11 kernel, latest myth and ivtv from atrpms (myth
0.18.1-111, ivtv-0.3.5l-92).
The box is built around Soyo Dragon2 motherboard, Athlon 3200+ CPU,
2GB of dual-channel RAM.
When video stutters, I often see disk light come on, especially in the
second case, so here is more about disks. There are 4 Seagate 300GB
ATA disks in the box, with two software RAIDs:
/dev/md0 mounted as /, raid1 built from hdb1, hdc1, 20GB, ext3
/dev/md1 mounted as /raid and used for all mythtv files, raid5 built
from hdb3, hdc3, hde3, hdf3 (currently runs in degraded mode until I
add 5th disk), about 1TB, JFS.
hdX2 are swap partitions, 1G on each disk, striped.
Seems like I need to tune the system for beter I/O performance. Any tips?
Thanks,
Fedor
--
Fedor G Pikus (fpikus at gmail.com)
http://www.pikus.net
http://wild-light.com
More information about the mythtv-users
mailing list