[mythtv-users] LiveTV and Recorded shows audio sync problems.

Sergio Tashdjian gtashi at gmail.com
Mon Jan 25 20:55:52 UTC 2010


No clues? Anyone?



On Fri, Jan 22, 2010 at 4:19 PM, Timothy E. Krantz <
tkrantz at stahurabrenner.com> wrote:

>  I get the same issue recording via composite or Svideo with 2 different
> Pinnacle 800i cards.  I never get the problem using the coax input just the
> composite or svideo.
>
> In my case it is also in the recording, not a playback issue.  I have no
> messages that indicate a problem in my logs either.
>
> Sorry, no help, just another data point.
>
> Tim
>
>  ------------------------------
> *From:* mythtv-users-bounces at mythtv.org [mailto:
> mythtv-users-bounces at mythtv.org] *On Behalf Of *Sergio Tashdjian
> *Sent:* Friday, January 22, 2010 12:35 PM
> *To:* Discussion about mythtv
>
> *Subject:* Re: [mythtv-users] LiveTV and Recorded shows audio sync
> problems.
>
>  I'm using an Analog V4l capture card, which is an Encore ENLTV-FM with
> chipset saa7134 (philips i think).
> Audio out on the capture card goes to my sound card line in with a cable.
> Alsa is set to capture from line in, and line in is muted so it goes through
> mythtv.
>
> If i start livetv and just watch, i don't see any new messages at the log.
> The sound just starts delaying gradually. If i check the recording later, it
> has the same delay, so it looks like the delay is being recorded, not just a
> problem at playing back.
>
> Anyway, if the info helps, i can see some bad messages when changing
> channels. Like these:
> *----------------------------------------------------------------------*
> *2010-01-22 15:23:01.711 WriteAudio: buffer underrun*
> *2010-01-22 15:23:07.495 WriteAudio: buffer underrun*
> *2010-01-22 15:23:07.735 NVP(0): prebuffering pause*
> *----------------------------------------------------------------------*
>
> So, when i change channels, i get these messages, the video starts showing
> but the audio starts 1 or 2 seconds later, and late.
> Maybe this problem is related with the gradual delay, and changing channels
> just makes it stall. But again, it happens gradually too without touching
> anything and without any message.
>
> Thanks,
> Sergio.
>
>
>
> On Fri, Jan 22, 2010 at 2:27 PM, Nick Morrott <knowledgejunkie at gmail.com>wrote:
>
>> 2010/1/22 Sergio Tashdjian <gtashi at gmail.com>:
>>  > Hi guys, i've been googling and reading lots of posts trying to solve
>> this
>> > problem, but no luck so far.
>> > I have mythtv installed in Ubuntu 9.10 (Karmic Koala) using the package
>> > provided in the Ubuntu repository.
>> > Mythtv version there is .22
>> > My problem is that audio/video sync starts ok , but sound gets delayed
>> > gradually, more and more. After an hour watching tv or recording a show
>> the
>> > delay in sound may reach more than 5 seconds.
>> > Im runing backend and frontend on the same Core 2 Duo PC with 2 GB ram.
>> CPU2
>> > shows high usage when watching tv, but CPU1 is almost free.
>> > I don't see any video or audio jumps , nor quality problems, it looks
>> and
>> > sounds perfectly, except for the growing sync loose.
>>
>> What type of capture card are you using? Do you see any
>> audio/video/sync messages in your mythfrontend logfile?
>>
>> Nick
>>
>> --
>> Nick Morrott
>>
>> MythTV Official wiki: http://mythtv.org/wiki/
>> MythTV users list archive:
>> http://www.gossamer-threads.com/lists/mythtv/users
>>
>> "An investment in knowledge always pays the best interest." - Benjamin
>> Franklin
>>  _______________________________________________
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
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>>
>
>
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