Mailing List Archive: MythTV: Users

Audio missing

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alan at chandlerfamily

Jul 3, 2012, 11:29 PM

Post #1 of 13 (929 views)
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Audio missing

As I said in a previous post, I have switched from debian stable to
unbuntu 12.04

I almost have the mythtv-backend working - except for two things. The
other I will put in another post, but the primary problem is that my
recordings don't have sound.

To check, after I recorded a program I copied the .mpg file on my
desktop where I know sound works and try to play it directly with a
media player there. and the video is there but the sound isn't

Any ideas where to look for the problem. The front end dvb devices all
have permissions root.video and the mythtv user belongs to both the
video and audio groups.

--
Alan Chandler
http://www.chandlerfamily.org.uk

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jyavenard at gmail

Jul 3, 2012, 11:31 PM

Post #2 of 13 (883 views)
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Re: Audio missing [In reply to]

On 4 July 2012 16:29, Alan Chandler <alan [at] chandlerfamily> wrote:
> As I said in a previous post, I have switched from debian stable to unbuntu
> 12.04
>
> I almost have the mythtv-backend working - except for two things. The other
> I will put in another post, but the primary problem is that my recordings
> don't have sound.
>
> To check, after I recorded a program I copied the .mpg file on my desktop
> where I know sound works and try to play it directly with a media player
> there. and the video is there but the sound isn't
>
> Any ideas where to look for the problem. The front end dvb devices all have
> permissions root.video and the mythtv user belongs to both the video and
> audio groups.

And did you go into Setup -> Audio and set the audio according to your
system requirement?
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alan at chandlerfamily

Jul 4, 2012, 12:00 AM

Post #3 of 13 (884 views)
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Re: Audio missing [In reply to]

On 04/07/12 07:31, Jean-Yves Avenard wrote:
> On 4 July 2012 16:29, Alan Chandler<alan [at] chandlerfamily> wrote:
>> As I said in a previous post, I have switched from debian stable to unbuntu
>> 12.04
>>
>> I almost have the mythtv-backend working - except for two things. The other
>> I will put in another post, but the primary problem is that my recordings
>> don't have sound.
>>
>> To check, after I recorded a program I copied the .mpg file on my desktop
>> where I know sound works and try to play it directly with a media player
>> there. and the video is there but the sound isn't
>>
>> Any ideas where to look for the problem. The front end dvb devices all have
>> permissions root.video and the mythtv user belongs to both the video and
>> audio groups.
> And did you go into Setup -> Audio and set the audio according to your
> system requirement?
> _______________________________________________
I assume by that you mean on the front end. Yes - and my frontend works

This is a backend issue. The recordings made to not contain audio.

--
Alan Chandler
http://www.chandlerfamily.org.uk

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alan at chandlerfamily

Jul 4, 2012, 12:06 AM

Post #4 of 13 (890 views)
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Re: Audio missing [In reply to]

On 04/07/12 08:00, Alan Chandler wrote:
>
>
> This is a backend issue. The recordings made to not contain audio.
>
This should say "The recordings made DO not contain audio"

--
Alan Chandler
http://www.chandlerfamily.org.uk

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jyavenard at gmail

Jul 4, 2012, 12:33 AM

Post #5 of 13 (882 views)
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Re: Audio missing [In reply to]

On 4 July 2012 17:06, Alan Chandler <alan [at] chandlerfamily> wrote:
> This should say "The recordings made DO not contain audio"

oh .. my bad.

Then you need to provide mode information such as the recording type
(DVB-T you mentioned ?)
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alan at chandlerfamily

Jul 4, 2012, 1:07 AM

Post #6 of 13 (874 views)
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Re: Audio missing [In reply to]

On 04/07/12 08:33, Jean-Yves Avenard wrote:
> On 4 July 2012 17:06, Alan Chandler<alan [at] chandlerfamily> wrote:
>> This should say "The recordings made DO not contain audio"
> oh .. my bad.
>
> Then you need to provide mode information such as the recording type
> (DVB-T you mentioned ?)
> _______________________________________________
Yes - DVB-T - I have a Hautpage NovaT 500 and a Pinnacle pctv nanostick
t2 290e

Not sure what it was recorded with yet - I thought the Nova T, but in
testing other stuff this morning I wonder if I made a mistake.

I'm going to leave it until this evening to explore further as I have a
day to go and live right now.

--
Alan Chandler
http://www.chandlerfamily.org.uk

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nick.rout at gmail

Jul 4, 2012, 1:12 AM

Post #7 of 13 (876 views)
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Re: Audio missing [In reply to]

On Wed, Jul 4, 2012 at 8:07 PM, Alan Chandler
<alan [at] chandlerfamily> wrote:
> On 04/07/12 08:33, Jean-Yves Avenard wrote:
>>
>> On 4 July 2012 17:06, Alan Chandler<alan [at] chandlerfamily> wrote:
>>>
>>> This should say "The recordings made DO not contain audio"
>>
>> oh .. my bad.
>>
>> Then you need to provide mode information such as the recording type
>> (DVB-T you mentioned ?)
>> _______________________________________________
>
> Yes - DVB-T - I have a Hautpage NovaT 500 and a Pinnacle pctv nanostick t2
> 290e
>
> Not sure what it was recorded with yet - I thought the Nova T, but in
> testing other stuff this morning I wonder if I made a mistake.
>
> I'm going to leave it until this evening to explore further as I have a day
> to go and live right now.

It would be odd for a digital card not to record audio. Can you run
mediainfo over one of the recorded files and post the results?
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pjrobinson at metronet

Jul 4, 2012, 1:40 AM

Post #8 of 13 (874 views)
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Re: Audio missing [In reply to]

On 04/07/12 09:12, Nick Rout wrote:
> On Wed, Jul 4, 2012 at 8:07 PM, Alan Chandler
> <alan [at] chandlerfamily> wrote:
>> On 04/07/12 08:33, Jean-Yves Avenard wrote:
>>> On 4 July 2012 17:06, Alan Chandler<alan [at] chandlerfamily> wrote:
>>>> This should say "The recordings made DO not contain audio"
>>> oh .. my bad.
>>>
>>> Then you need to provide mode information such as the recording type
>>> (DVB-T you mentioned ?)
>>> _______________________________________________
>> Yes - DVB-T - I have a Hautpage NovaT 500 and a Pinnacle pctv nanostick t2
>> 290e
>>
>> Not sure what it was recorded with yet - I thought the Nova T, but in
>> testing other stuff this morning I wonder if I made a mistake.
>>
>> I'm going to leave it until this evening to explore further as I have a day
>> to go and live right now.
> It would be odd for a digital card not to record audio. Can you run
> mediainfo over one of the recorded files and post the results?
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://www.mythtv.org/mailman/listinfo/mythtv-users
>

I've experienced a similar problem, ie recordings not containing sound
(on play back that is). My ubuntu 11.10 PC nanostick 290e DVB-T/T2
system has recorded several programmes which on play back don't have
sound, including the "Italian Job" broadcast a few months ago. I've also
got some recordings where sound is present in the lead in adverts etc
but as soon as the movie starts the sound is no longer present. Is
there some way of decoding such recordings, other than playing them, to
see what the problem might be? I recall, for me, this only happens with
DVB-T2.
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John.Veness.mythtv at pelago

Jul 4, 2012, 2:12 AM

Post #9 of 13 (875 views)
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Re: Audio missing [In reply to]

On 04/07/2012 09:40, PJR wrote:
> I've also
> got some recordings where sound is present in the lead in adverts etc
> but as soon as the movie starts the sound is no longer present.

That sounds like the movie is using different speakers (e.g. 5.1
surround sound) than the adverts (e.g. just stereo) - maybe that might
help you troubleshoot?

John

--
John Veness, MythTV user, UK, DVB-T
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pjrobinson at metronet

Jul 4, 2012, 2:35 AM

Post #10 of 13 (859 views)
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Re: Audio missing [In reply to]

On 04/07/12 10:12, John Veness wrote:
> On 04/07/2012 09:40, PJR wrote:
>> I've also
>> got some recordings where sound is present in the lead in adverts etc
>> but as soon as the movie starts the sound is no longer present.
>
> That sounds like the movie is using different speakers (e.g. 5.1
> surround sound) than the adverts (e.g. just stereo) - maybe that might
> help you troubleshoot?
>
> John
>

John, yes that's a thought. I think I tried that without success but
will try again sometime to check.
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alan at chandlerfamily

Jul 4, 2012, 3:28 AM

Post #11 of 13 (860 views)
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Re: Audio missing [In reply to]

pjrobinson at metronet

Jul 4, 2012, 6:02 AM

Post #12 of 13 (858 views)
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Re: Audio missing [In reply to]

On 04/07/12 11:28, Alan Chandler wrote:
> On 04/07/12 09:12, Nick Rout wrote:
>> On Wed, Jul 4, 2012 at 8:07 PM, Alan Chandler
>> <alan [at] chandlerfamily> wrote:
>>> On 04/07/12 08:33, Jean-Yves Avenard wrote:
>>>> On 4 July 2012 17:06, Alan Chandler<alan [at] chandlerfamily>
>>>> wrote:
>>>>> This should say "The recordings made DO not contain audio"
>>>> oh .. my bad.
>>>>
>>>> Then you need to provide mode information such as the recording type
>>>> (DVB-T you mentioned ?)
>>>> _______________________________________________
>>> Yes - DVB-T - I have a Hautpage NovaT 500 and a Pinnacle pctv
>>> nanostick t2
>>> 290e
>>>
>>> Not sure what it was recorded with yet - I thought the Nova T, but in
>>> testing other stuff this morning I wonder if I made a mistake.
>>>
>>> I'm going to leave it until this evening to explore further as I
>>> have a day
>>> to go and live right now.
>> It would be odd for a digital card not to record audio. Can you run
>> mediainfo over one of the recorded files and post the results?
>> _______________________________________________
>>
>
> Strange - yesterday it wasn't working. Today I get the Audio fine.
>
>
After some investigation I've found that the recordings that don't
playback sound are the ones that say they are multi-channel sound (ITV1
HD), stereo is ok. No amount of changing the audio setup makes any
difference. I've also found that playing live TV, BBC HD, which has
multi-channel sound, has sound both and when played back from the
recording. I'll record another ITV1 HD movie and see what the result is.
Given that this problem so far has shown up on commercial TV, I wonder
if it's something to do with advert detection? I've also tried playing
back the recordings directly via VLC and they just freeze around the
point the sound goes. Problems is I don't think advert detection nor
transcoding jobs are enabled. Mystified!

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John.Veness.mythtv at pelago

Jul 4, 2012, 7:52 AM

Post #13 of 13 (855 views)
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Re: Audio missing [In reply to]

On 04/07/2012 14:02, PJR wrote:
> After some investigation I've found that the recordings that don't
> playback sound are the ones that say they are multi-channel sound (ITV1
> HD), stereo is ok. No amount of changing the audio setup makes any
> difference. I've also found that playing live TV, BBC HD, which has
> multi-channel sound, has sound both and when played back from the
> recording. I'll record another ITV1 HD movie and see what the result is.
> Given that this problem so far has shown up on commercial TV, I wonder
> if it's something to do with advert detection? I've also tried playing
> back the recordings directly via VLC and they just freeze around the
> point the sound goes. Problems is I don't think advert detection nor
> transcoding jobs are enabled. Mystified!

Advert detection doesn't actually change anything on the recording, it
just attempts to detect where the adverts are and prompts the user to
skip them, so I don't expect that's the problem.

Cheers,

John

--
John Veness, MythTV user, UK, DVB-T
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