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[vdr] Re: A/V synchronisation
----- Original Message -----
From: "Andreas Schultz" <email@example.com>
Sent: Thursday, October 17, 2002 3:44 PM
Subject: [vdr] Re: A/V synchronisation
> Hi Joachim,
> firstname.lastname@example.org wrote:
> > Hi,
> > I do now use vdr (1.0.4) for some time and have the following problem:
> > I use a video beamer as display and an separate amp for the sound.
> > Unfortunately sound and video are always out of sync (the beamer
> delays the
> > picture for
> > app.. 240 ms). I would like to have a function to patch the pts value
> of the
> > sound packets with an offset (configurable). Of course this would
> work only
> > in transfer and playback mode.
> > It would be even better if this offset could be set in the firmware,
> but I
> > assume that the
> > current firmware does not support this. Also I assume that there may be
> > limitations for the
> > offset as the sound needs to be buffered if it is done in the firmware.
> > Don't get me wrong, I do not ask for an implementation (I can do that
> > myself),
> > but I would like to discuss the issue a bit before doing so. So is
> > anybody out that may
> > have an opinion an that.
> I'm not sure that this would work. The DVB card has only very limited
> audio and video buffers. Adding an addional 240ms delay to audio packets
> that are already aprox. 380ms late would most certainly overflow those
> It could be done using a soundcard. Then you are able to delay audio as
> much as you like. However the new problem then will be keeping the delay
> constant and audio/video in sync.
> What you are describing will hit us anyway once somebody creates a
> framebuffer device plugin and/or with AC3 playback through soundcards.
Mhh, anyone out willing to create a MPlayerOut-plugin for VDR?
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