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Date:      Mon, 22 Dec 1997 09:31:28 -0800
From:      Amancio Hasty <hasty@rah.star-gate.com>
To:        Randall Hopper <rhh@ct.picker.com>
Cc:        Luigi Rizzo <luigi@labinfo.iet.unipi.it>, multimedia@FreeBSD.ORG
Subject:   Re: MPEG audio/video sync & Re: These mtv video pauses are murder 
Message-ID:  <199712221731.JAA01187@rah.star-gate.com>
In-Reply-To: Your message of "Mon, 22 Dec 1997 12:19:42 EST." <19971222121942.13340@ct.picker.com> 

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Hi, 
Do you also keep track of  skipped video frames? The driver 
may need a little work to faithfully report how many frames it
has skipped .

	Cheers,
	Amancio

> Luigi Rizzo:
>  |I suppose the problem if any will be in the capture phase. We have a
>  |way to timestamp (using the cpu clock) incoming video frames (do you
>  |use that ?), but e.g. for audio you cannot rely on the sample rate
> 
> I do store off a timestamp for each frame of data (video frame +
> accumulated audio to that point).  This is used to know how many frames we
> missed, which is how many times the preceeding frame is replicated in the
> mpeg_encode input stream to normalize the video back up to the full FPS rate.
> 
> Thanks,
> 
> Randall





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