[mythtv-users] MythTV 0.27.4: Trouble-free LiveTV with ivtv?

[Hika van den Hoven]

Hoi Karl,

Thursday, April 9, 2015, 6:50:47 PM, you wrote:

> On Thu, Apr 9, 2015 at 7:51 AM, Hika van den Hoven <hikavdh at gmail.com>
> wrote:

>> Hoi Nick,
>>
>> Thursday, April 9, 2015, 2:30:37 PM, you wrote:
>>
>> > I'm wondering if there are any users running the current stable
>> > release of MythTV (0.27.4) with ivtv-based hardware capture card(s)
>> > (i.e. PVR-150/250/500) who do *not* have any problems with LiveTV
>> > playback?
>>
>> > If you are one of the lucky ones, please could you provide details of
>> > your distribution, kernel version, and any patches you have needed to
>> > apply.
>>
>> > Thanks,
>> > Nick
>> > _______________________________________________
>>
>> I don't know what troubles you're revering to. The only problem I have
>> with my two PVR500 cards is the seek tables. They are incorrect on
>> recording and I have to rebuild them, which I cannot do on liveTV.
>> I use the latest Gentoo ebuild with kernel 3.12.13 I have to upgrade
>> sometime in the near future. I use a patch for sound issues on the
>> PVR500 The one 350 I have works OK.
>>

> Hika,

> What are the symptoms of your seek table issues with your PVR500? I haven't
> noticed any problems with seek tables with my PVR500. Maybe it's a PAL/NTSC
> thing? Also, what patch are you using for the sound issues? I am using a
> command that runs after a channel change (can't access my system right now
> but I think it's ivtvctl or maybe v4lctl or something like that) which
> re-assigns the audio to avoid the "buzzing". It's completely solved the
> problem but it does add some delay to channel change. If there's a driver
> fix I'd like to explore that. Oh, and I'm also on kernel 3.12 currently
> because I had screen freezes on intel with kernel versions >=~3.16. It's
> apparently fixed in 3.19 so when that goes stable I'll move to that.

> Thanks,

> Karl

I had a long discussion about those seek table issues on this list
last spring. I didn't have them on 0.26 and it's possible they don't
show on my second PVR500, just as the sound issue. They are different
with different sub components. In essence if I just play the file it
goes OK, but a wrong, to short, duration is shown and at the end it
plays past what it thinks is the end. But if I jump it jumps wrong and
I cannot jump past what it thinks is the end. It was suggested it has
to do with variable frame count or so. I haven't been able to really
pinpoint it and as I rarely use liveTV and rebuilding solves it...

The sound issue is a different one then you mention. Without the patch
I simply have no sound on the first PVR500 I acquired. It's a patch to
the initialization section in ivtv-streams.c. As I understand it's a
part that was brought in for later ivtv devices and goes wrong whith a
small part of older ones. I have to look it up. I might have the link
stil to the discussion list I picked it off. I remember I also saw a
lot of mentioning about your issue, but it was over a year ago, so
it's vague.

Thanks about mentioning that kernel issue, but my backend/server is
all amd, so probably not applicable. I left of upgrading mainly
because it needs rebooting and repatching and I have to do that in the
nightly hours, when it's not recording or doing other things I don't
want to interrupt. All my frontends though are intel based.

Tot mails,
  Hika                            mailto:hikavdh at gmail.com

"Zonder hoop kun je niet leven
Zonder leven is er geen hoop
Het eeuwige dilemma
Zeker als je hoop moet vernietigen om te kunnen overleven!"

De lerende Mens