[wdmaudiodev] Re: Audio Video Sincronization
- From: "David A. Hoatson" <dhoatson@xxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 1 Feb 2006 08:28:44 -0800
Hello,
To do a good time stretching algorithm is fairly complicated, so I doubt anyone
is going to post the source here (unless someone feels really generous today!).
Your best bet is to insure synchronization (with a hardware lock between audio
& video) before you capture so you don't have to deal with problems on the back
end. This time it is better not to 'fix it in post'. :-)
Thank you,
David A. Hoatson
Lynx Studio Technology, Inc.
www.lynxstudio.com
----- Original Message -----
From: Bipin Mistry
To: wdmaudiodev@xxxxxxxxxxxxx
Sent: Wednesday, February 01, 2006 8:11 AM
Subject: [wdmaudiodev] Re: Audio Video Sincronization
hello,
This would have helped me if I was recording the Audio...
But here seen is I am using 3rd party dll provided by end user which gives me
audio files as output... (no source code or any document on architeacture for
this dll is available)
So I have to play my game on the output files generated for every user by 3rd
party dll.
And that too once 3rd party dll has completed his task.
My scope of game is
1 mixing these output files and creating single wave file.
2.single wave file to be merged with video.
So if group members can provide me codeing logic or technic how can I stretch
the play time of any wav file then it can work out for me within the scope i
explained above.
thanks
Bipin Mistry.
On 2/1/06, Robert Bielik <robert.bielik@xxxxxxx> wrote:
Could you not try to output the same audio frame a couple of times
according to pseudo algo:
For each audio frame:
if (audioFrameEnergy < silenceThreshold) // Would help make it less
noticable
{
if (video lags audio by x ms)
{
run last audio frame again;
}
if (audio lags video by x ms)
{
drop an audio frame;
}
}
That way audio should keep up, but I don't know if that's good enough for
you.
/R
On Wed, 1 Feb 2006 19:15:27 +0530, Bipin Mistry < bpnmistry@xxxxxxxxx>
wrote:
>
> I have gone through various groups and discussions...
> Where by "Time Stretching" technic was supposed to be the solution.
> But no such Logic or the Algo.. or the Source Code that explains how it
> can
> be executed was found on the net till yet.
>
> Any help towards any of these areas will be gr8 help to me..
>
> Thanks
> Bipin Mistry
>
>
>> --
>> Tim Roberts, timr@xxxxxxxxx
>> Providenza & Boekelheide, Inc.
>>
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