[mythtv-users] Libdts killed ac3 passthough - can't seem to get it back

Mon May 1 00:17:25 UTC 2006

On 4/25/06, Martin Ebourne <lists at ebourne.me.uk> wrote:

> >   I installed libdts from Ubuntu repository.   That enabled
> > DTS passthrough on the mythtv compile.  But now, if I mark either DTS
> > passthrough or AC3 passthrough, I no longer get sound.
>
> Ok. The DTS shouldn't generally affect AC3, so maybe something else is not
>
> right. Also I take it you've tried this on several programs, not just one?

The problem is not likely MythTV.  Xine gives me the same problem when I
select passthrough.  No sound.  Any ideas where to look for help on this?
Googling hasn't gotten me anywhere and I don't know where to start.   Was
thinking about installed Alsa from cvs with the hopes that it would repair
any problems with my distribution's version.

> I tried removing libdts and recompiling Myth without DTS passthrough but
> > my AC3 still doesn't work.  I no longer get sound when I check AC3.
> Any
> > Ideas?
>
> Sounds like there's something else that went wrong with both compiles
> then, and DTS isn't really the problem, else it would have worked again
> after you removed it.

I agree.  I just wish I knew how to get back to a functioning system with
full 5.1 sound. :(

Was it a newer version of mythtv you compiled compared to the one you had
> working?
>
Try running mythfrontend -v audio.

I am running 0.19 currently but have had this problem on svn as well.  I
don't get anything that looks obviously wrong from verbose output.   The
output is below.  Please tell me if you see anything obvious. [btw- I also
have 300 mS problem on A/V sync - would love some hints on that as well if
you see anything].

The only other possibility is if some data the surround processor didn't
> like was sent to it and it "shut down". Mine goes into automute if it gets
> crap sometimes. Maybe try switching it off & on.
>
> Cheers,
>
> Martin

This is with AC3 enabled and dts compiled in.  No sound.

2006-04-30 20:08:04.570 Using realtime priority.
2006-04-30 20:08:04.572 OutputAudioLoop: audio paused
2006-04-30 20:08:04.572 65536 bytes free on soundcard
2006-04-30 20:08:04.572 WriteAudio: Preparing 6144 bytes (1536 frames)
2006-04-30 20:08:04.576 TV: Changing from None to WatchingPreRecorded
2006-04-30 20:08:04.577 59392 bytes free on soundcard
2006-04-30 20:08:04.577 WriteAudio: Preparing 6144 bytes (1536 frames)
2006-04-30 20:08: 04.581 53248 bytes free on soundcard
2006-04-30 20:08:04.604 _AddSamples bytesa44, used=1, freev7999,
timecode$7
2006-04-30 20:08:04.605 _AddSamples bytesa44, useda45, freev1855,
timecode'9
2006-04-30 20:08: 04.606 _AddSamples bytesa44, used289, freeu5711,
timecode11
2006-04-30 20:08:04.607 _AddSamples bytesa44, used433, freet9567,
timecode43
2006-04-30 20:08:04.616 _AddSamples bytesa44, used$577, freet3423,
timecode75
2006-04-30 20:08:04.640 _AddSamples bytesa44, used0721, frees7279,
timecode at 7
2006-04-30 20:08:04.658 _AddSamples bytesa44, used6865, frees1135,
timecodeC9
2006-04-30 20:08:04.693 _AddSamples bytesa44, usedC009, freer4991,
timecodeG1
2006-04-30 20:08:04.715 _AddSamples bytesa44, usedI153, freeq8847,
timecodeP3
2006-04-30 20:08:04.730 _AddSamples bytesa44, usedU297, freeq2703,
timecodeS5
2006-04-30 20:08:04.745 OutputAudioLoop: Play Event
2006-04-30 20:08:04.745 Broadcasting free space avail
2006-04-30 20:08:04.745 WriteAudio: Preparing 6144 bytes (1536 frames)
...deleted repeated WriteAudio lines
2006-04-30 20:08:04.849 _AddSamples bytesa44, used433, freet9567,
timecodei5
2006-04-30 20:08:04.852 audio waiting for space on soundcard: have 6112 need
6144
2006-04-30 20:08:04.859 Broadcasting free space avail
2006-04-30 20:08:04.859 WriteAudio: Preparing 6144 bytes (1536 frames)
2006-04-30 20:08:04.859 audio waiting for space on soundcard: have 1376 need
6144
2006-04-30 20:08: 04.867 audio waiting for space on soundcard: have 2848
need 6144
2006-04-30 20:08:04.874 audio waiting for space on soundcard: have 4192 need
6144
2006-04-30 20:08:04.880 TV: Attempting to change from WatchingPreRecorded to
None
2006-04-30 20:08:04.881 audio waiting for space on soundcard: have 5536 need
6144
2006-04-30 20:08:04.888 Broadcasting free space avail
2006-04-30 20:08:04.888 WriteAudio: Preparing 6144 bytes (1536 frames)
2006-04-30 20:08: 04.888 audio waiting for space on soundcard: have 800 need
6144
2006-04-30 20:08:04.896 audio waiting for space on soundcard: have 2272 need
6144
2006-04-30 20:08:04.899 _AddSamples bytesa44, used289, freeu5711,
timecoder7
2006-04-30 20:08:04.903 audio waiting for space on soundcard: have 3616 need
6144
2006-04-30 20:08:04.911 audio waiting for space on soundcard: have 5280 need
6144
2006-04-30 20:08:04.919 Broadcasting free space avail
2006-04-30 20:08:04.919 WriteAudio: Preparing 6144 bytes (1536 frames)
2006-04-30 20:08:04.919 audio waiting for space on soundcard: have 608 need
6144
2006-04-30 20:08:04.927 audio waiting for space on soundcard: have 2080 need
6144
2006-04-30 20:08:04.934 audio waiting for space on soundcard: have 3424 need
6144
2006-04-30 20:08:04.941 audio waiting for space on soundcard: have 4800 need
6144
2006-04-30 20:08:04.947 Killing AudioOutputDSP
2006-04-30 20:08:04.949 OutputAudioLoop: Stop Event
2006-04-30 20:08:04.949 kickoffOutputAudioLoop exiting
2006-04-30 20:08:04.968 TV: Changing from WatchingPreRecorded to None
2006-04-30 20:08:05.055 Enable DPMS
0: start_time: 6264.921 duration: 161.531
1: start_time: 6264.899 duration: 161.509
stream: start_time: 69609.990 duration: 1795.041 bitrate403 kb/s
2006-04-30 20:08:05.139 AFD: Opened codec 0x826fac0, id(MPEG2VIDEO)
type(Video)
2006-04-30 20:08:05.139 AFD: Opened codec 0x827a8d0, id(AC3) type(Audio)
2006-04-30 20:08:05.139 AFD: Audio Track #1 is A/V stream #1 and has 6
channels in the English language(6647399).
2006-04-30 20:08:05.140 AFD: Selected track 1: English AC3 5.1ch (A/V Stream
#1)
2006-04-30 20:08:05.140 AFD: Initializing audio parms from audio track #1
2006-04-30 20:08:05.140 AFD: Audio format changed
                        from id(NONE)    -1Hz -1ch   0bps    ; id(NONE)
-1Hz -1ch   0bps
                        to   id( AC3) 48000Hz  6ch  16bps pt ; id( AC3)
48000Hz  2ch  16bps pt
0: start_time: 6264.921 duration: 161.531
1: start_time: 6264.899 duration: 161.509
stream: start_time: 69609.990 duration: 1795.041 bitrate403 kb/s
2006-04-30 20:08:05.931 AFD: Opened codec 0x826fac0, id(MPEG2VIDEO)
type(Video)
2006-04-30 20:08:05.932 AFD: Opened codec 0x82659a0, id(AC3) type(Audio)
2006-04-30 20:08:05.932 AFD: Audio Track #1 is A/V stream #1 and has 6
channels in the English language(6647399).
2006-04-30 20:08:05.933 AFD: Selected track 1: English AC3 5.1ch (A/V Stream
#1)
2006-04-30 20:08:05.933 AFD: Initializing audio parms from audio track #1
2006-04-30 20:08:05.933 AFD: Audio format changed
                        from id(NONE)    -1Hz -1ch   0bps    ; id(NONE)
-1Hz -1ch   0bps
                        to   id( AC3) 48000Hz  6ch  16bps pt ; id( AC3)
48000Hz  2ch  16bps pt
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mythtv.org/pipermail/mythtv-users/attachments/20060430/64d5e6dc/attachment.htm 