Subject: Re: [linux-audio-dev] MTC, SMPTE, etc.
From: Paul Barton-Davis (pbd_AT_Op.Net)
Date: Sat Jul 22 2000 - 03:24:49 EEST
In message <3978AB66.F0E9B7C9_AT_yahoo.com>you write:
>Paul Barton-Davis wrote:
>>
>> >I'd rather say the solution is to not only decode the SMPTE frame,
>> >but also keep track of it's exact position in the audio stream. Works
>>
>> who says its part of the same audio stream ? i would tend to have
>> SMPTE streaming in through a cheap interface, and not taking up a
>> channel on a good multichannel card.
>
>Sorry if this is a dumb question, as I've never done anything
>with SMPTE... but wouldn't this have exactly the same problems as
>trying to sync audio data from different cards?
i'm not sure. SMPTE is not even close to frame-accurate (the finest
resolution is 1/30 second or thereabouts). there is therefore a lot of
room for sloppiness.
the situation i was thinking of was not multiple external devices,
both synced, with SMPTE coming in over one audio interface and audio
coming over another. rather, i was thinking of a situation with an
external audio source, and external SMPTE source (say, a video
playback device).
i wish to god that SMPTE had never taken off. its the most ridiculous
thing since, errr, oh, something like APL. more precisely, its fine
for video timing, but its *insane* that its become accepted for audio
timing.
--p
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