Re: [Mvpmc-devel] DVB UK Recordings sound and picture going out of sync

[<mar...@mh...>]

I do frequently get out of syncs followed by a crash that I have to reboo=
t
the box for as STOP doesn't work....never really thought the two would be
related though

Mark


>
> On Tue, 29 Aug 2006 10:53:47 BST, Malcolm Smith wrote:
>> ge...@ac... wrote:
>> > On Mon, 28 Aug 2006 00:30:26 BST, mar...@mh... wrote:
>> >
>> >> I've noticed this getting worse recently, by recently I mean the la=
st
>> >> month or so.  I generally keep up with the latest from GIT (which I
>> >> compile myself) so could be either that or something relating to
>> quality
>> >> changes on the DVB network in the UK.
>> >>
>> >> Has anybody else noticed?  Is there anything I can do about it / lo=
gs
>> or
>> >> other files I can send for somebody who knows what they are doing t=
o
>> >> analyse ?
>> >>
>> >> Help would be much appreciated as it's beginning to spoil my viewin=
g
>> now :
>>(
>> >>
>> >> Mark
>> >>
>> >
>> > Does it get out of sync on its own?  Or is this only after you have
>> skipped
>> > forward or backward in the file?
>> >
>> > If it gets out of sync on its own, then I'd suggest you hit the MENU
>> button
>> > during playback, go into the auido stream menu, and find out what ki=
nd
>> of
>> > audio stream you're listening to.  If it is AC3, then it does not
>> surprise
>> > me that you are having problems, since AC3 audio has sync problems i=
n
>> > general.
>> >
>> > If it only gets out of sync when you skip around in the file (or whe=
n
>> you
>> > start playback), and you are using mpeg1/2 audio, then you have the
>> > following two options:
>> >
>> > 	- Seeking in the file should often get the audio/video back in sync=
,
>> > 	  so you can skip forward and back, and often get back in sync.
>> > 	- Hitting the record button (small red circle) will momentarily
>> > 	  pause the video, allowing the audio to catch up.  This only works
>> > 	  if the audio is behind the video, and you may have to hit it
>> > 	  several times before the video pops back in sync.
>> >
>> > If none of this helps, can you provide a short video sample?
>> >
>> > Jon
>> >
>> > --------------------------------------------------------------------=
-----
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>> >
>> Jon,
>>
>> I have 2 sources of recording
>>  1. PVR250 capturing composite
>>  2. UK DVB-T
>>
>> With 1 it will go out of sync if you use FFWD or skip forward through
>> adds, normally however 1 skip back will bring it back in. It doesn't
>> normally get out of sync on playback alone.
>>
>> With 2 it depends on the signal quality - recently I've been having so=
me
>> poor reception so sync can
>> move a long way out - 1 or 2 secs in extreme cases. To fix this repeat=
ed
>> skip backs sometimes work, the "record" button does not. These are not
>> AC3.
>>
>> Is it possible to periodically monitor the timestamps on the streams?
>> That way the code could insert pauses to cope with sync issues.
>
> It should be.  But without documentation on how to use the IBM kernel
> modules, we're stuck trying to figure it out ourselves.
>
>> Also ocassionally the decoder thread seems to crash with poor quality
>> streams- it stops playback and won't respond to stop etc, but the GUI
>> thread is fine. You can go back to the menu and choose another
>> programme, but playback will not work until you either reboot or resta=
rt
>> the GUI with Power off/on
>>
>> -malc-
>
> I've never seen this.  Even hitting stop does not fix the problem?  Do =
you
> know what sort of debug output mvpmc gives on stdout/stderr when this
> happens?
>
> Jon
>