[vdr] Re: A/V synchronisation

["Rene Bartsch" <vdr@bartschnet.de>]

----- Original Message -----
From: "Andreas Schultz" <aschultz+vdr@warp10.net>
To: <vdr@linuxtv.org>
Sent: Thursday, October 17, 2002 3:44 PM
Subject: [vdr] Re: A/V synchronisation


> Hi Joachim,
>
> joachim.koenig@gmx.net 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
by
>  > myself),
>  > but I would like to discuss the issue a bit before doing so. So is
there
>  > 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
> buffers.
> 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?

Rene




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