[mythtv-users] Jerkey DVD playback

Josh TwoOneSix at thatclothingco.com
Mon Jan 22 15:47:49 UTC 2007


Peter wrote:
> Rich West wrote:
>   
>> P S wrote:
>>   
>>     
>>> On 1/20/07, stanley kamithi <skamithi at gmail.com> wrote:
>>>   
>>>     
>>>       
>>>> I experienced jerky dvd playback when I was playing with the chromakey OSD
>>>> with XvMC or Xv . When I go back
>>>> to a software blended OSD, playback is fine. I have a Nvidia 5200, Intel
>>>> 2.4Ghz.
>>>>
>>>>
>>>>
>>>>  On 1/19/07, Peter <pete at putzin.net> wrote:
>>>>     
>>>>       
>>>>         
>>>>> I just got my remote FE running today and it's great. HD/music in my
>>>>> bedroom rocks. Anyway, I'm trying to playback DVD's on it (actually
>>>>> network mounted ISO's), and the playback a little bit jerky. The NFS
>>>>> mount is over gigabit ethernet, and the audio is fine, but the video is
>>>>> just ever so jumpy. Not unwatchable, but you get sort of a Blair Witch
>>>>> queasiness when you stare at it too long (jumpy video, not that the
>>>>> movie was all that scary). Anyway, it's using the internal DVD player so
>>>>> I'm not sure how to attack this to make it better. Any thoughts?
>>>>>
>>>>>
>>>>>       
>>>>>         
>>>>>           
>>>>     
>>>>       
>>>>         
>>> I noticed the same thing recently, I disabled opengl sync in the
>>> playback settings.
>>>
>>> Abit NF7-S w/ Athlon XP 2600+, 512 MB ram, Nvidia FX 5200
>>>     
>>>       
>> On all three of my FE's, I have noticed the same issue.  It doesn't make 
>> it unwatchable, but it's as if the video is trying to 'catch up'.  Just 
>> a stutter here and there, most noticeable as the image pans (and this is 
>> on both 16:9 and 4:3 tv's).  Since my mythtv setup is so new, it is 
>> still on my list of things to investigate.
>>
>> -Rich
>>
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>>
>>
>>   
>>     
> This sounds like exactly what I'm seeing. However, HD and SD live tv 
> plays back fine. One thing I did notice is that even though XvMC is 
> enabled, and the logs seem to indicate it's on, I get a color OSD, so I 
> pretty much assume something is wrong. I'm about to play with it now. 
> Maybe find something later this evening.
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>
>
>   
Same issue here. My MythTV frontend box has MORE then enough juice to 
handle the video stream but the playback is all jerky as described in 
this post. I thought it was my wireless until I found that I was able to 
stream to my laptop VIA Winblows and MythTVPlayer. From a network 
bandwidth standpoint, you should be able to stream at DVD quality over 
TCP/IP at 5mb/sec with no major problems. I did some general file copy 
testing and found that my wireless can shoot an entire DVD vob file 
(5.2gb) in  10 minutes over my NFS share... Logically, a movie being 
101 minutes in length shouldn't have any problems moving over the 
network in-stream. My audio files stream and play with no problems, but 
my DVD rips (videos), Live TV, and Recorded Programs all act the same. I 
have tried using different compressions, but nothing seems to be 
working. I have a suspicion that maybe the frontend box is attempting to 
write video to a temp folder that is on the same NFS share as the 
mythbackend and it's causing problems... does anyone know (or have a 
link) to how mythfrontend actually works with video files? Mainly does 
it have a default storage location for temp files or does it just stream 
from the backend NFS share as if it were a local file?

Like Peter, I'm going to play around with this box this 
afternoon/evening and I'll post back if I discover anything.

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