I've been
investigating the stuttering playback on the 350 and i now understand at least
on scenario that causes this.
Most mpeg files
(coming from the 350/DVB cards) that are interlaced require the top field to be
shown first. However some require the bottom field to be shown first and in this
case we currently get stuttering/jumpy playback. Whilst i understand this i
don't yet know how to fix it since it either requires code in the player to swap
the fields or a way of passing a hint to the 350 to tell it to swap the fields.
The latter is the best route but there is no standard way of doing this, though
i can invent and XVAttribute to do this and probably get support added to mythtv
to support this. It would also be good to try to get that support added to
mplayer & xine as well though that might take a bit
longer.
Anyway from the
mails i've seen there may be other causes of stuttering
playback.
For those suffering
from the problem can you let me know whether or not the problem occurs
repeatedly with some particular files or dvd's etc. and if so send me a file
that reproduces the problem.
If it is not
reproducible with a particular file can you tell me the scenario that causes it
to happen. (The most common one i have heard is recording at the same time as
playback).
If you believe the
problem is down to recording at the same time can you
1) Send me the spec
of your system
2) Try playing back
and running dd if=/dev/video0 of=/dev/null bs=64k at the same time and let me
know if this causes a problem
3) Try playing back
and running the same dd command except outputing to a file in the same directory
as myth records to and let me know if that causes a problem.
Thanks
John
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