Re: [Gnash-dev] long sound delay when using FFMPEG+SDL

[Hannes Mayr]

Hello,

strk wrote:
> On Mon, Sep 21, 2009 at 07:02:41PM +0200, Udo Giacomozzi wrote:
> > At last we've managed to get working audio on Gnash+Nomad. :-)
> >
> > Now there is the problem that the audio is way late compared to the
> > screen (approx. 1 second).
>
> GST ?
> I suspect you hit the "slow resampling" issue described by
> Bastiaan long time ago. There might be even a bug item for that
> or maybe archives. For what I remember depending on the gst
> plugin used to do resampling you could have different performances
> one of which was horrible.

good guess :-) Actually it has to do with the resampling process, but in 
our case we use FFMPEG and not GST.

As far as I was able to track down the problem it isn't the resampling 
itself but the initialization of it which takes at least a second (the 
call to FFMPEG's audio_resample_init() - we use the latest FFMPEG 
release 0.5 BTW). So everytime an audio stream starts to play there is 
this delay when the resampler instance is being initialized. Commenting 
out the resampling code and video and audio are perfectly in sync 
(playing stereo MP3s is also fine as no resampling is needed).


Any ideas?



Hannes