[mythtv-users] Jitters during playback

Mitchell Gore mitchell.gore at gmail.com
Sat Jan 28 17:27:54 UTC 2012


> FWIW, I had been getting a lot of OTA recordings that showed
> "jitters/pixelation" during playback.  When I switched my profile from
> VDPAU decode + VDPAU render to ffmpeg decode + VDPAU render, all the
> issues went away.  I don't think it's a problem with MythTV code, but a
> problem with VDPAU's ability to cope with small errors in the stream due
> to small signal issues.
>
> Mike
> _______________________________________________
>

Mike,

thanks for the response.  Unfortunately I dont have enough CPU power to
decode MPEG2 w/o VDPAU.

I did some more playing around with the cable line and location of my
wireless router and was able to get a little bit signal gain.  For examle
right now im at:
SS: 100%
SigQ: 91%
SymQ: 100
OOB: SS 64%, SQ, 100%

I cant get Signal Quality up to 100%.  I still get slight jitters.  When I
play in Windows on my Windows Laptop it plays fine.  Im guessing its VDPAU
related but cant fix it.

My settings:
Decoder: VDPAU Accel
CPU 1
Deblocking Checked
Renderer: vdpau, OSD:vdpau

Prim De-Int: Bob2x
Filters: vdpauskipchroma, vdpaustudio, vdpaucolorspace

I am using the following Nvidia Card:
mitchell at mythfe:cat /var/log/mythtv$ cat /proc/driver/nvidia/version
NVRM version: NVIDIA UNIX x86 Kernel Module  270.41.06  Mon Apr 18 14:54:25
PDT 2011
GCC version:  gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4)
mitchell at mythfe:cat /var/log/mythtv$ cat
/proc/driver/nvidia/gpus/0/information
Model:           GeForce 8400 GS
IRQ:             18
Video BIOS:      62.98.12.00.00
Card Type:       PCI-E
DMA Size:        40 bits
DMA Mask:        0xffffffffff
Bus Location:    0000:02.00.0


I am going to try and upgrade my install to latest as I am pretty far
behind on updates.

Any other pointers?

Thanks,
Mitchell
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