[Ardour-Dev] SMPTE track

Robin Gareus robin at gareus.org
Thu Jul 10 04:34:10 PDT 2008

Hash: SHA1

Hi Flo, and ardour-dev's!

plutek-infinity wrote:
>> From: Florian Faber <faber at faberman.de>
>> I'm looking for a way to interpret a track containing a SMPTE timecode 
>> _as_ timecode. I couldn't find any means in ardour itself nor the web, 
>> so: 

Did you have a look at http://ltcsmpte.sf.net/  ? - well not the
web-page but the code there ;)

>> - Is there a way to interpret a track as timecode?
>> - If not, what would be the best way? Adding a track mode "SMPTE TC", 
>> interpreting the included data and importing it?

not trivial - libltcsmpte allows you to decode or encode the SMPTE
timecode(s) for chunks of audio-data.

There's a small example client that uses jack-audio-in-ports to
read/display LTC/SMPTE in real-time and generate LTC from jack-transport
(the latency compensation of the latter is a bit quirky)

Synchronizing jack-transport to incoming LTC is as good as impossible.

Eventually I've used ltcsmpte to read the first LTC/SMPTE from a file
and applied this as an offset for the corresponding A/V track. - ..but
there's a hacked version of jplay2 that takes an audio-file and a
LTC-file as input and writes time-stretched audio from vari-speed
recorings.. that can be imported into ardour. - It may or mat not be too
hard to write a plugin that reads LTC and controls rubberband inside
ardour ?!

so long,

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