[mythtv-users] Video is 'x' frames behind audio (too slow), dropping frame to catch up

[Chris Porter]

On Wed, Aug 15, 2012 at 6:58 AM, Jim Oltman <jim.oltman at gmail.com> wrote:

> On Wed, Aug 15, 2012 at 8:49 AM, Joseph Fry <joe at thefrys.com> wrote:
>
>> MythBuntu 12.04.1 LTS x64
>>> MythTV Version : v0.25
>>> MythTV Branch : fixes/0.25
>>> Network Protocol : 72
>>> Library API : 0.25.20120408-1
>>>
>>> Intel Core2Duo E7400 @ 2.8GHz
>>> 4GB RAM DDR2 800MHz
>>> Zotac 430GT w/ nVidia 295.04 Drivers
>>>
>>> I'm having issues playing BluRay rips that are placed in a folder
>>> structure.  It only seems to be an issue with rips of that size and BluRay
>>> bitrate.  I'm having occasional stutters and dropped video frames as shown
>>> in the log I've attached.  I've disabled the vdpaubuffersize=48 and
>>> vdpaustudiocolor from my VDPAU Playback Profile (Advanced 2x).  I don't
>>> seem to be having issues with any of my 1080i MPEG2 recordings from OTA TV.
>>>  I've also enabled "Extra Audio Buffering" and disabled "Real-Time
>>> Priority".  Once I did that, I thought all was solved.  It was well over an
>>> hour before I saw those errors again.  Compositing has been disabled via
>>> xorg.conf and I've even set the nVidia PowerMizer to Performance Mode.  I
>>> had to do that with a separate script that runs after Xorg loads.  I added
>>> to AUTOSTART in MythBuntu.  I've verified that PowerMizer is set to 1 after
>>> a reboot.
>>>
>>
>> Realtime priority and extra audio buffering should only help in
>> situations like this... though I would wager that the realtime option isn't
>> actually doing anything, unless you made the prerequisite changes in the OS.
>>
>> Is your video card plugged into a full x16 slot, I know some motherboards
>> have slots that look like x16 but are really only x4.  I doubt it's the
>> issue but perhaps Blueray needs that extra bandwidth.
>>
>> Is the rip stored locally, or are you pulling it across a network?
>>
>>
>>>  My question:  Is my setup just too slow to handle the BluRay bitrate
>>> I'm trying to put through my machine?  Is it time for me to build a new
>>> front end machine?  Or is there something else I'm missing?  Should I ditch
>>> the GT430 and get a 520?  Any help would be appreciated.  Thanks!
>>>
>>
>> GT520 is a step down from the GT430... you don't want to do that. (
>> http://www.anandtech.com/show/4268/nvidia-releases-geforce-gt-520)
>>
>> It really sounds like your issue is with bandwidth somewhere between the
>> source files and the video card.  The GT430 should handle all of the heavy
>> lifting so long as you get the content to it fast enough.
>>
>
> Thanks for the reply.  My network consists of an HP ProCurve 1800-24G 24
> port Gig switch.  I have a single cable running up to a Dell PowerConnect
> 16 port Gig switch behind my home theater.  It feeds the MythBox, TV, PS3,
> and Denon receiver.  So I've got plenty of network bandwidth.  The
> MythBackend is actually a VM that sits on a hefty SuperMicro motherboard.
>  The storage for the recordings/videos is on a FreeNAS VM running ZFS
> RAIDZ2 served out over NFS.  It's all done over emulated Intel 1Gb NICs (as
> FreeNAS doesn't have VMXNET3 support).
>
> I'll have to check the port that the video card is in.  I'm pretty sure
> it's a 16x, but Dell could be lying to me.
>
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>
It has been suggested the 430 cards do not have enough head room to
playback 60Hz content.  Are your bluray rips 1080p?

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