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Hi Zoltan,

We will need some help to investigate this problem. Basically try to
narrow it down to the smallest problematic pieces:

- try other formats. mpg/dvd and asf should be good candidates, do
they show sync problems too?
- try a different audio driver (oss/alsa) or a different
audio.oss_sync_method (like probebuffer).

when we know what component is causing trouble it will be much easier to fix.

thanks,

Miguel


On Thu, 29 Jul 2004 06:55:47 +0200, Zoltan Boszormenyi
<zboszor@...> wrote:
> I noticed it lately on some files, but not all, one AVI is MSMPEG4v3
> with MP3 128kbit/48kHz that has the problem. The audio slips
> continuously, after 10 minutes the audio is about 2 seconds late.
>

hallo miguel,

> We will need some help to investigate this problem. Basically try to
> narrow it down to the smallest problematic pieces:
> 
> - try other formats. mpg/dvd and asf should be good candidates, do
> they show sync problems too?
> - try a different audio driver (oss/alsa) or a different
> audio.oss_sync_method (like probebuffer).
> 
> when we know what component is causing trouble it will be much easier to fix.

i see this problem too and it is really really bad - shouldn't be hard
to reproduce. i think i have ruled out the audio-driver possibility as i
have tried oss and alsa here, both have the same problem. 

another piece of information: i have downgraded to 1-rc5 yesterday and
the problem is gone :)

kind regards,

   guenter


-- 
"Why must you tell me all your secrets when it's hard enough to love
you knowing nothing?"
                -- Lloyd Cole and the Commotions

Miguel Freitas =EDrta:
> Hi Guenter,
>=20
> hope you are fine ;-)
>=20
> On Thu, 29 Jul 2004 20:10:13 +0200, Guenter Bartsch
> <bartscgr@...> wrote:
>=20
>>i see this problem too and it is really really bad - shouldn't be hard
>>to reproduce. i think i have ruled out the audio-driver possibility as =
i
>>have tried oss and alsa here, both have the same problem.
>>
>>another piece of information: i have downgraded to 1-rc5 yesterday and
>>the problem is gone :)

Thank god, I thought it's just my machine. :-)

> thanks, these are very important hints. and i'm happy to know that our
> last release is good...
>=20
> now we must find out if this is demuxer specific or not. this is a
> show stopper for rc6. since i'm leaving on vacations next week (away
> for 2 weeks), i will have very little time to investigate this. any
> help is appreciated.

OK, when I have put my son to bed I will test some media.
One thing is sure: ISO MPEG-4 AVI / MP3 128 kbit/48000 kHz audio
does not slip. It's also handled by ffmpeg. So it's not a
demuxer, more likely a decoder bug.

Best regards,
Zolt=E1n B=F6sz=F6rm=E9nyi

Zoltan Boszormenyi =EDrta:
> Miguel Freitas =EDrta:
>=20
>> Hi Guenter,
>>
>> hope you are fine ;-)
>>
>> On Thu, 29 Jul 2004 20:10:13 +0200, Guenter Bartsch
>> <bartscgr@...> wrote:
>>
>>> i see this problem too and it is really really bad - shouldn't be har=
d
>>> to reproduce. i think i have ruled out the audio-driver possibility a=
s i
>>> have tried oss and alsa here, both have the same problem.
>>>
>>> another piece of information: i have downgraded to 1-rc5 yesterday an=
d
>>> the problem is gone :)
>=20
>=20
> Thank god, I thought it's just my machine. :-)
>=20
>> thanks, these are very important hints. and i'm happy to know that our
>> last release is good...
>>
>> now we must find out if this is demuxer specific or not. this is a
>> show stopper for rc6. since i'm leaving on vacations next week (away
>> for 2 weeks), i will have very little time to investigate this. any
>> help is appreciated.
>=20
>=20
> OK, when I have put my son to bed I will test some media.
> One thing is sure: ISO MPEG-4 AVI / MP3 128 kbit/48000 kHz audio
> does not slip. It's also handled by ffmpeg. So it's not a
> demuxer, more likely a decoder bug.
>=20
> Best regards,
> Zolt=E1n B=F6sz=F6rm=E9nyi

Sorry for the little delay. Result:

DVD:			perfect sync
MPEG2 file, SVCD:	-"-
ISO-MPEG4 (XviD):	-"-
MSMPEG4v3 / AC3 audio:	-"-
MSMPEG4v3 / MP3 audio:	slips (ffmpeg)
MSMPEG4v3 / MP3 audio:	perfect sync (win32v), same file as above

I have set win32v priority to 50 and the out of sync movie is now
perfect. The "codec pack" was downloaded from mplayerhq.hu long ago.

Best regards,
Zolt=E1n B=F6sz=F6rm=E9nyi

Miguel Freitas =EDrta:
> Hi Zoltan,
>=20
> On Fri, 30 Jul 2004 20:47:33 +0200, Zoltan Boszormenyi
> <zboszor@...> wrote:
>=20
>>MSMPEG4v3 / MP3 audio:  slips (ffmpeg)
>>MSMPEG4v3 / MP3 audio:  perfect sync (win32v), same file as above
>=20
>=20
> great work! may you try the attached patch?
>=20
> regards,
>=20
> Miguel

With this patch watching 10 minutes into the movie it does not show
the problem. It's perfectly in sync. Thanks!

Best regards,
Zolt=E1n B=F6sz=F6rm=E9nyi

Hi Zoltan,

On Fri, 30 Jul 2004 20:47:33 +0200, Zoltan Boszormenyi
<zboszor@...> wrote:
> MSMPEG4v3 / MP3 audio:  slips (ffmpeg)
> MSMPEG4v3 / MP3 audio:  perfect sync (win32v), same file as above

great work! may you try the attached patch?

regards,

Miguel

Hi Guenter,

hope you are fine ;-)

On Thu, 29 Jul 2004 20:10:13 +0200, Guenter Bartsch
<bartscgr@...> wrote:
> i see this problem too and it is really really bad - shouldn't be hard
> to reproduce. i think i have ruled out the audio-driver possibility as i
> have tried oss and alsa here, both have the same problem.
> 
> another piece of information: i have downgraded to 1-rc5 yesterday and
> the problem is gone :)

thanks, these are very important hints. and i'm happy to know that our
last release is good...

now we must find out if this is demuxer specific or not. this is a
show stopper for rc6. since i'm leaving on vacations next week (away
for 2 weeks), i will have very little time to investigate this. any
help is appreciated.

regards,

Miguel

Zoltan Boszormenyi =EDrta:
> Miguel Freitas =EDrta:
>=20
>> Hi Zoltan,
>>
>> On Fri, 30 Jul 2004 20:47:33 +0200, Zoltan Boszormenyi
>> <zboszor@...> wrote:
>>
>>> MSMPEG4v3 / MP3 audio:  slips (ffmpeg)
>>> MSMPEG4v3 / MP3 audio:  perfect sync (win32v), same file as above
>>
>>
>>
>> great work! may you try the attached patch?
>>
>> regards,
>>
>> Miguel
>=20
>=20
> With this patch watching 10 minutes into the movie it does not show
> the problem. It's perfectly in sync. Thanks!
>=20
> Best regards,
> Zolt=E1n B=F6sz=F6rm=E9nyi

There is an interesting side effect of this fix. Using external
subtitles, the previously experienced delay of starting the movie
is gone.

Unfortunately, the delay on seeking is still there.

This delay (in case you developers haven't experienced) goes like this:
one frame (maybe the first frame where the new position started) is
frozen for several seconds while the sound goes on, then the picture
catches up suddenly synced with the sound.

Best regards,
Zolt=E1n B=F6sz=F6rm=E9nyi