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Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend

 

 

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mythtv at cvs

Jul 16, 2008, 9:45 PM

Post #1 of 21 (3760 views)
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Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69 [at] gmail | Owner: ijr
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: mythtv | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------+--------------------------------------------
When AC3 passthrough is selected on the OSX frontend, occasionally the
video an audio begin playing at an accelerated rate. This usually happens
when the show is not bookmarked - i.e. playback starts from the beginning
of the file. It never happens if AC3 passthrough is un-checked.
I've attached a log file. The accelerated playback session begins at the
top of the file and ends at 21:29:24. The normal playback session begins
immediately afterward at 21:29:25. The most obvious difference between
the two is the appearance of a slew of " NVP: Video is x.xxxx frames
behind audio (too slow), dropping frame to catch up." messages once
playback begins in the first case.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552>
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mythtv at cvs

Jul 17, 2008, 8:01 PM

Post #2 of 21 (3617 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69 [at] gmail | Owner: ijr
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: mythtv | Version: unknown
Severity: medium | Resolution:
Mlocked: 0 |
-------------------------------+--------------------------------------------

Comment(by ctreleaven [at] cogeco):

I have two Mac OS X machines. I've experienced this problem as well on my
BE/FE machine running .21-fixes (different revs up to 17775). This
machine is set up to use digital audio.

My remote frontend running .21-fixes has never experienced this problem.

I'm happy to produce more logs if that will help. The ones I've captured
so far don't seem to show anything useful.

Craig

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:1>
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mythtv at cvs

Jul 17, 2008, 8:02 PM

Post #3 of 21 (3622 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69 [at] gmail | Owner: ijr
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: mythtv | Version: unknown
Severity: medium | Resolution:
Mlocked: 0 |
-------------------------------+--------------------------------------------

Comment(by ctreleaven [at] cogeco):

Replying to [comment:1 ctreleaven [at] cogeco]:
> My remote frontend running .21-fixes has never experienced this problem.

And, of course, I should have been clear that the remote frontend uses
analog audio output.

Sorry.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:2>
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mythtv at cvs

Aug 12, 2008, 2:41 PM

Post #4 of 21 (3564 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69 [at] gmail | Owner: ijr
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: mythtv | Version: unknown
Severity: medium | Resolution:
Mlocked: 0 |
-------------------------------+--------------------------------------------

Comment(by stephen.hocking [at] gmail):

I'm also seeing this, on trunk (SVN 18137). VLC on the same machine doing
passthrough successfully plays back DVDs and the home theatre receiver
lights up indicating that it sees an AC3 5.1 signal. This appears to be an
OS/X specific problem.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:3>
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mythtv at cvs

Nov 10, 2008, 8:59 PM

Post #5 of 21 (3454 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69 [at] gmail | Owner: ijr
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: mythtv | Version: unknown
Severity: medium | Resolution:
Mlocked: 0 |
-------------------------------+--------------------------------------------

Comment(by scram69 [at] gmail):

It appears this bug is getting worse. I just tried -fixes version 18900
from the Sniderpad. Now, following an episode of accelerated playback, I
lose all sound output from my mac mini (under System Preferences > Sound,
even the system alert sounds are greyed out). A reboot is required to
restore functioning sound output.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:4>
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mythtv at cvs

Nov 29, 2008, 8:26 AM

Post #6 of 21 (3395 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69 [at] gmail | Owner: ijr
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: mythtv | Version: unknown
Severity: medium | Resolution:
Mlocked: 0 |
-------------------------------+--------------------------------------------

Comment(by janh [at] gmx):

I do have 2 Mac machines as backends and:
Analog output/digital output (SPDIF): Smooth like butter (a few crashes
now and then)
AC3 passthrough: The frontend crashes most of the times and I have to
REBOOT! my mac because the audio is gone from the whole system.

If that could be fixed MythTV would really be twice as useful.

I am so desperate I'm actually looking for a different frontend hardware
because I'd love to enjoy the AC3 sound on my Home Theatre.

Thanks guys!! And keep up the good work.

Regards,

Jan.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:5>
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mythtv at cvs

Feb 1, 2009, 2:54 PM

Post #7 of 21 (3263 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69 [at] gmail | Owner: ijr
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: mythtv | Version: unknown
Severity: medium | Resolution:
Mlocked: 0 |
-------------------------------+--------------------------------------------

Comment(by nigel):

OK. I am still trying to work this out. The original -v output doesn't
show anything interesting, and I haven't been able to reproduce the fault
with my two HD MPEG recordings (note that I don't have an AC3 decoder
handy, so this is tedious to test).
[[BR]]
Guys, is it _always_ the same recording, at the same place? If so, please
find me one that does it at the start, and provide a few MB of that
recording so I can try it here.
[[BR]]
If the people who have crashes could please provide logs (e.g.
~/Library/Logs/CrashReporter/mythfrontend.crash.log), it will also give me
something solid to look into.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:6>
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mythtv at cvs

Feb 1, 2009, 7:50 PM

Post #8 of 21 (3249 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69 [at] gmail | Owner: ijr
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: mythtv | Version: unknown
Severity: medium | Resolution:
Mlocked: 0 |
-------------------------------+--------------------------------------------

Comment(by ctreleaven [at] cogeco):

Replying to [comment:6 nigel]:
> Guys, is it _always_ the same recording, at the same place?

Nigel: Nope, often I'll try to start playing back a recording from the
beginning and have it play in accelerated mode 2 or 3 times in succession
and finally play properly.

Very recently, I've noticed that if I skip forward (60 second jumps) a few
times, a file that started with accelerated playback will then switch to
play normally. I've got to try this more to see if there is a magic
sequence.

BTW, I'm running under 10.4.11 as others reported worse problems with 10.5
and above.

Craig

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:7>
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mythtv at cvs

Feb 2, 2009, 7:05 PM

Post #9 of 21 (3251 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69 [at] gmail | Owner: ijr
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: mythtv | Version: unknown
Severity: medium | Resolution:
Mlocked: 0 |
-------------------------------+--------------------------------------------

Comment(by stephen.hocking [at] gmail):

I'm currently running trunk under 10.5.6, the first time one goes to play
an AC3 soundtrack directly to SPDIF it ssems to work, but if you attempt
to adjust the speed you either lose sound or it sounds like it's coming
from underwater. The sound subsystem is then trashed and you have to
reboot to get it working again.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:8>
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mythtv at cvs

Feb 18, 2009, 10:01 PM

Post #10 of 21 (3195 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69 [at] gmail | Owner: ijr
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: mythtv | Version: unknown
Severity: medium | Resolution:
Mlocked: 0 |
-------------------------------+--------------------------------------------

Comment(by anonymous):

Replying to [comment:6 nigel]:

> If the people who have crashes could please provide logs (e.g.
~/Library/Logs/CrashReporter/mythfrontend.crash.log), it will also give me
something solid to look into.

Here's what I believe to be the relevant snippet from my log:

2/18/09 9:40:21 PM [0x0-0x104104].org.osx-bundler.MythFrontend[1587]
2009-02-18 21:40:21.406 AFD: codec AC3 has 2 channels

2/18/09 9:40:21 PM [0x0-0x104104].org.osx-bundler.MythFrontend[1587]
2009-02-18 21:40:21.407 AFD: Opened codec 0x10d0c00, id(AC3) type(Audio)

2/18/09 9:40:21 PM [0x0-0x104104].org.osx-bundler.MythFrontend[1587]
2009-02-18 21:40:21.407 AFD: codec AC3 has 2 channels

2/18/09 9:40:21 PM [0x0-0x104104].org.osx-bundler.MythFrontend[1587]
2009-02-18 21:40:21.408 AFD: Opened codec 0x10d1000, id(AC3) type(Audio)

2/18/09 9:40:21 PM [0x0-0x104104].org.osx-bundler.MythFrontend[1587]
2009-02-18 21:40:21.408 AFD: codec AC3 has 2 channels

2/18/09 9:40:21 PM [0x0-0x104104].org.osx-bundler.MythFrontend[1587]
2009-02-18 21:40:21.408 AFD: Opened codec 0x10d1400, id(AC3) type(Audio)

2/18/09 9:40:21 PM [0x0-0x104104].org.osx-bundler.MythFrontend[1587]
2009-02-18 21:40:21.414 Opening audio device 'CoreAudio:'. ch 6(2) sr
48000

2/18/09 9:40:21 PM [0x0-0x104104].org.osx-bundler.MythFrontend[1587]
2009-02-18 21:40:21.414 AudioOutputCA Error: StreamsList() - could not get
list size:
560227702

2/18/09 9:40:21 PM [0x0-0x104104].org.osx-bundler.MythFrontend[1587]
2009-02-18 21:40:21.414 AudioOutputCA Error: Configured for AC3 passthru
but can't find an AC3 output stream. Disabling audio to prevent static

2/18/09 9:40:21 PM [0x0-0x104104].org.osx-bundler.MythFrontend[1587]
2009-02-18 21:40:21.414 AudioOutput Error: Aborting reconfigure

2/18/09 9:40:21 PM [0x0-0x104104].org.osx-bundler.MythFrontend[1587]
2009-02-18 21:40:21.414 NVP: Disabling Audio, reason is: Aborting
reconfigure

Unfortunately, "Disabling audio" means disabling audio for all apps ...
forever! I really wish mythfrontend would refrain from trashing my system
that way. I have to reboot to get audio to work again for any app...

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:9>
MythTV <http://www.mythtv.org/>
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mythtv at cvs

Sep 16, 2009, 4:18 AM

Post #11 of 21 (2746 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69 [at] gmail | Owner: nigel
Type: defect | Status: assigned
Priority: minor | Milestone: unknown
Component: Ports - OSX | Version: unknown
Severity: medium | Resolution:
Mlocked: 0 |
-------------------------------+--------------------------------------------
Changes (by nigel):

* owner: ijr => nigel
* status: new => assigned
* component: mythtv => Ports - OSX


--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:10>
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mythtv at cvs

Nov 16, 2009, 4:16 AM

Post #12 of 21 (2665 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69@… | Owner: nigel
Type: defect | Status: assigned
Priority: minor | Milestone: unknown
Component: Ports - OSX | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------+--------------------------------------------

Comment(by stormshaker):

I'm running 0.22-fixes (22764) on OSX 10.6.1. I have the same problem.
After some testing though, it seems like it might be a problem on stopping
playback rather than starting?

My settings for Audio are the simplest I can make: CoreAudio, Passthrough:
Default, Output channels 5.1, Passive Upmix, AC3 Passthrough on and SP/DIF
passthrough on.

When I playback a recording that contains digital audio, I see the
receiver switch over to Dolby Digital and the playback is perfect. Then
press ESC to stop playback and return to the GUI, the receiver is still
receiving Dolby Digital output. Go back to the same recording and play it
again, it plays much faster than normal speed. Quit Mythfrontend and
return to the desktop - receiver is still stuck on Dolby Digital. Go back
into Mythfrontend and play the recording again - it plays at normal speed.
Back to the GUI then play again, fast speed.

So it seems there's something left behind after the first playback of a
recording with digital audio that affects subsequent playbacks. Restarting
Mythfrontend is enough to clear it.

OS X 10.6.2 is out, I will repeat the tests under 10.6.2 after upgrading.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:11>
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mythtv at cvs

Nov 16, 2009, 8:40 AM

Post #13 of 21 (2650 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69@… | Owner: nigel
Type: defect | Status: assigned
Priority: minor | Milestone: unknown
Component: Ports - OSX | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------+--------------------------------------------

Comment(by Brian K Boonstra <(myth) (at) (boonstra.org)>):

This is apparently still a problem on 10.5.x as well, as reported in AVS
Forums [http://www.avsforum.com/avs-
vb/showthread.php?p=17541726#post17541726 in this post].

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:12>
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mythtv at cvs

Nov 17, 2009, 1:41 PM

Post #14 of 21 (2619 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69@… | Owner: nigel
Type: defect | Status: assigned
Priority: minor | Milestone: unknown
Component: Ports - OSX | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------+--------------------------------------------

Comment(by stormshaker):

Alas still no luck with OS X 10.6.2.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:13>
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mythtv at cvs

Nov 17, 2009, 10:25 PM

Post #15 of 21 (2614 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69@… | Owner: nigel
Type: defect | Status: assigned
Priority: minor | Milestone: unknown
Component: Ports - OSX | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------+--------------------------------------------

Comment(by scram69@…):

I've added two new attachments made with the OSX 0.22 frontend. These were
made running -v audio,libav,playback.
One is for an instance with AC3 passthrough enabled and normal playback
occurred; the other is for an instance with accelerated playback.
I've looked carefully, and the only difference I can find between the two
is the appearance of:
{{{
2009-11-17 20:39:15.728 NVP(1): Video is 4.39223 frames behind audio (too
slow), dropping frame to catch up.
}}}
every few milliseconds during the accelerated playback.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:14>
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mythtv at cvs

Dec 1, 2009, 10:05 AM

Post #16 of 21 (2476 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69@… | Owner: nigel
Type: defect | Status: assigned
Priority: minor | Milestone: unknown
Component: Ports - OSX | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------+--------------------------------------------

Comment(by Brian K Boonstra <(myth) (at) (boonstra.org)>):

The Plex guys recently had some AC3 problems that were worked around, as
documented at http://forums.plexapp.com/index.php?showtopic=8979 .

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:15>
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mythtv at cvs

Jan 5, 2010, 12:49 PM

Post #17 of 21 (2238 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69@… | Owner: nigel
Type: defect | Status: assigned
Priority: minor | Milestone: unknown
Component: Ports - OSX | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------+--------------------------------------------

Comment(by anonymous):

Still an issue with 0.22-fixes (current as of today 2010-01-05) and Mac OS
X 10.6 Snow Leopard. The 'Plex' discussion has not been of any help to
our particular setup.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:16>
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mythtv at cvs

Feb 24, 2010, 3:24 PM

Post #18 of 21 (1830 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69@… | Owner: nigel
Type: defect | Status: assigned
Priority: minor | Milestone: unknown
Component: Ports - OSX | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------+--------------------------------------------

Comment(by anonymous):

Is there a workaround for this issue? If it is not on passthrough, is
there still a way to have it play AC3?

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:17>
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mythtv at cvs

Feb 24, 2010, 3:26 PM

Post #19 of 21 (1828 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69@… | Owner: nigel
Type: defect | Status: assigned
Priority: minor | Milestone: unknown
Component: Ports - OSX | Version: unknown
Severity: medium | Mlocked: 1
-------------------------------+--------------------------------------------
Changes (by robertm):

* mlocked: 0 => 1


Comment:

http://svn.mythtv.org/trac/wiki/TicketHowTo

Read. Then read again. Then never do that again.

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Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:18>
MythTV <http://www.mythtv.org/>
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mythtv at cvs

Aug 25, 2010, 7:41 PM

Post #20 of 21 (907 views)
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Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69@… | Owner: nigel
Type: defect | Status: infoneeded
Priority: minor | Milestone: unknown
Component: Ports - OSX | Version: unknown
Severity: medium | Resolution:
Keywords: | Ticket locked: 1
-------------------------------+--------------------------------------------
Changes (by robertm):

* status: assigned => infoneeded


Comment:

Can anyone test trunk to see if this is still an issue? We haven't
checked in with this ticket since the audio class rewrite.

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Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:19>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Aug 27, 2010, 4:03 PM

Post #21 of 21 (872 views)
Permalink
Re: Ticket #5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend [In reply to]

#5552: AC3 passthrough causes accelerated playback on OSX 0.21 frontend
-------------------------------+--------------------------------------------
Reporter: scram69@… | Owner: nigel
Type: defect | Status: assigned
Priority: minor | Milestone: unknown
Component: Ports - OSX | Version: unknown
Severity: medium | Resolution:
Keywords: | Ticket locked: 1
-------------------------------+--------------------------------------------
Changes (by robertm):

* status: infoneeded => assigned


--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5552#comment:20>
MythTV <http://www.mythtv.org/>
MythTV
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http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-commits

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