[mythtv-users] MythMusic skipping on OGG files

[Matthew Phillips]

On 05/04/2005, at 5:27 PM, James Smith wrote:
>> On 05/04/2005, at 7:47 AM, James Smith wrote:
>>> On Mon, 2005-04-04 at 22:58 +0930, Matthew Phillips wrote:
>>>> On 04/04/2005, at 10:15 PM, James Smith wrote:
>>>>> Hi all,
>>>>>
>>>>> I've just got MythTV installed happily, and am very pleased so far.
>>>>> I'm
>>>>> having a problem with MythMusic though - it seems to be reporting
>>>>> track
>>>>> lengths wrong (generally 20 seconds or so too long), and often 
>>>>> skips
>>>>> ahead
>>>>> a few seconds at random while playing. Most of my music is in OGG
>>>>> format,
>>>>> so it may be something specific to this format, I'm not sure. 
>>>>> Anyone
>>>>> come
>>>>> across anything like this?
>>>>
>>>> My post of a few days ago ("MythMusic playback speed too fast") is
>>>> probably related - I'm seeing  a similar thing for mp3 playback 
>>>> minus
>>>> the skipping (they just play fast and end early). But I'm pretty 
>>>> sure
>>>> it's been happening for a few OGG's in the collection too.
>>>
>>> I had a bit of a hack around with module options to see if it was the
>>> soundcard output bitrate or anything, but with no luck. I tried 
>>> setting
>>> the output bitrate explicitly to 44100Hz, but then everything
>>> noticeably
>>> slowed down - pitch changed and everything, but the timer on 
>>> MythMusic
>>> still ended a few seconds early, just as before, so I put it back.
>>>
>>> I'm using the built-in AC97 sound device using the ATI IXP driver, 
>>> so I
>>> put this in modprobe.conf to change the bitrate:
>>>
>>> options snd-atiixp ac97_clock=44100
>>>
>>> If you're not getting pitch shifting though, I guess this isn't your
>>> problem either...
>>
>> I'm assuming (perhaps incorrectly?) that if sound is working OK for
>> other components of the system (which it is), then this is more likely
>> to be related to the mp3/ogg decoders rather than the sound driver.
>>
>> I haven't had time to look into this properly yet, and indeed I'm not
>> even sure where to start playing. Does anyone know where to start
>> tweaking the decoders used by MythMusic?
>
> Don't know if the information in this post is still relevant, but 
> maybe it
> might point you in the right direction:
> http://mythtv.org/pipermail/mythtv-users/2003-April/002234.html

Hmm, it's 2 years old but does sound very similar to what I'm seeing. 
Might be useful - thanks.

Matthew.