[mythtv-commits] Ticket #8030: AC3 track confuses trunk audio code

MythTV mythtv at cvs.mythtv.org
Fri Feb 5 19:56:49 UTC 2010


#8030: AC3 track confuses trunk audio code
-------------------------------------------+--------------------------------
 Reporter:  Yeechang Lee <ylee@…>          |       Owner:  jyavenard
     Type:  defect                         |      Status:  new      
 Priority:  minor                          |   Milestone:  unknown  
Component:  MythTV - Audio Output          |     Version:  head     
 Severity:  medium                         |     Mlocked:  0        
-------------------------------------------+--------------------------------
 My frontend has a Chaintech AV-710 sound card, and all audio goes from the
 frontend to my receiver via S/PDIF. Playing non-AC3 and AC3 audio from my
 MythTV recordings has almost always been flawless.

 Since moving to the trunk/0.23 audio code, for the last month or so of
 ''The Tonight Show with Conan O'Brien'' before cancelation, its AC3 track
 would usually confuse mythfrontend. The issue may be caused by the
 transition between non-AC3 and AC3 audio in the same recording. Four
 samples from the last episode are available, each 100MB (about 55 seconds)
 in length.

 *[https://docs.google.com/leaf?id=0B9pxJys5bvq7ODViYWNkZmEtMzZmMC00YTY1LTgyYzktODdmMzFkZTM1NjQy&hl=en
 conan.mpg] Taken from the middle of the recording. Audio plays properly.

 *[https://docs.google.com/leaf?id=0B9pxJys5bvq7ZjYyZDQyNmEtNGE4MC00MDgxLTgzMWEtZTE0MGNjZWNkYWI3&hl=en
 conan2.mpg] Taken from the beginning of the recording. The non-AC3 track
 from the local-news program preceding ''Tonight'' plays correctly; the AC3
 track from ''Tonight'' does not.

 *[https://docs.google.com/leaf?id=0B9pxJys5bvq7N2UwZGUzZjUtNmI3ZC00Yzk0LTliZDgtMDY1MTdiMmU5Y2Jh&hl=en
 conan3.mpg] Starts a second or two after ''Tonight'' begins. Audio plays
 correctly.

 *[https://docs.google.com/leaf?id=0B9pxJys5bvq7YmE4MDYzMGEtMWZhYS00OTE0LWEyOWMtNTE5YzAwOTZiMWYx&hl=en
 conan4.mpg] Starts just before or after (hard to tell) ''Tonight'' begins.
 Audio does not play correctly.

 This issue also exists with other NBC programs, but not consistently as
 with ''Tonight''; last night's episode of ''Community'' does, but previous
 ones did not. Both recordings are from over-the-air; unfortunately I do
 not know if other NBC recordings I've seen with the issue were also from
 OTA as opposed to FireWire.

-- 
Ticket URL: <http://svn.mythtv.org/trac/ticket/8030>
MythTV <http://www.mythtv.org/>
MythTV


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