Jean Connelly wrote:
Regarding:
The system is a 3.06 GHz P4 running Fedora Core 3. The video Card
is a NVidia 5200FX. For capture, all I have is a HD3000. I've checked
that DMA is working on all the drives. I built mythtv from stable
source, 0.18.1. I used the following configure options:
--enable-xvmc --enable-opengl-vsync --enable-dvb
--dvb-path=/lib/modules/2.6.12- 1.1381_FC3smp/build/include
--disable-firewire --disable-joystick --disable-ivtv --enable-proc-opt
--disable-xvmc-vld --enable-opengl-vsync
I have close to an identical system; and I have what is probably
equivalent stuttering. HDTV (live or recorded) is totally unplayable in
myth. I have tried with and without opengl sync. I can't find the xvmc
option in the gui with this myth version to disable xvmc for testing.
Recorded 1080i plays badly (with frequent pauses and never with audio
sync) in mplayer with xvmc and ffmpeg12mc and plays even worse without
xvmc. I'll try transcoding my latest sample clips to see if they are
fine when played back at standard resolutions.
I've got
3.06 GHz P4 (which is a 533Mhz FSB chip)
512 MB Ram
BE7-RAID mobo
Nvidia 5200FX
Fedora Core 3
Night before last's myth svn. No deinterlacing requested.
Prebuffer pauses all over the place.
I think what we really need is an hdtv playback test suite external to
myth to get better benchmarks on actual system performance. From
previous posts to the list ("well I got *my* P4 1.4Ghz system to
playback hdtv") I think that my system *should* be able to playback hdtv
without issue, but perhaps there are some motherboard weaknesses or such
that make it impossible.
After some tinkering, I found out what the problem was. I think.
I was trying to play a 1080i stream on a 720p screen. What I think
was happening was that the 1080i stream could not be rendered using XVMC
to 720p. It had to me done in software, ie: the CPU. When I changed
the display to 1920x1080, XVMC kicked in and the image played nicely, so
long as it was done by root. No, I wasn't using xrandr. I will when I
get everything going under Core 4.
This prompted my to "upgrade" to Core 4 so I can get realtime
priority threads via PAM. I don't really consider it an upgrade. My
experience is that Core 4 has more issues than Core 3. Case in point,
try compiling 18.1 stable with GCC4. But I like the idea of running
mythfrontend as root more distasteful than the problems.
Chris...
--
"Those who would give up essential liberty to purchase a little
temporary safety deserve neither liberty nor safety" -- Benjamin
Franklin
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