Re: [LAU] Lack of smpte support simply sux

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To: Peter P. <p8rpp@...>
Cc: <linux-audio-user@...>
Date: Wednesday, December 26, 2012 - 8:32 pm

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On 12/26/2012 08:38 PM, Peter P. wrote:
[..]

The easiest way for MTC->LTC is indeed Ardour3 since SVN rev13418 (Nov
2012) [1]: slave Ardour to MTC, use A3's LTC generator. LTC->MTC is
not yet supported by A3, because A3's MTC generator still needs some
work for proper vari-speed support [2].

However, there's jltc2mtc from https://github.com/x42/ltc-tools

analog LTC audio (e.g. from tape)
- -> soundcard
- -> JACK audio-port
- -> jltc2mtc
- -> jack midi-port
- -> ...

https://github.com/x42/mtc-tools features a standalone MTC generator
(gets sync from jack-transport).

HTH, don't hesitate to ask if you have any questions,
robin

PS. All tools properly compensate for latency. But in order to achieve
exact sample-sync, the port latencies of the physical jack-ports must
be set correctly (using jackd's -I -O options).

The actual roundtrip latency depends on many factors. The only way to
learn the value is to measure it. To do so, there's jack_delay [3] by
Fons Adriaensen; a variant of it (jack_iodelay) comes with jackd itself.

[1] http://gareus.org/wiki/a3extsync
[2] LTC->MTC is already supported by A3 but accuracy does not match
our expectations so it has been explicitly disabled. UTSL
[3] http://kokkinizita.linuxaudio.org/linuxaudio/
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Messages in current thread:
[LAU] Lack of smpte support simply sux, Eric Steinberg, (Tue Dec 25, 5:00 pm)
Re: [LAU] Lack of smpte support simply sux, Peter P., (Wed Dec 26, 7:38 pm)
Re: [LAU] Lack of smpte support simply sux, Robin Gareus, (Wed Dec 26, 8:32 pm)
Re: [LAU] Lack of smpte support simply sux, Brett McCoy, (Wed Dec 26, 7:48 pm)
Re: [LAU] Lack of smpte support simply sux, Paul Davis, (Wed Dec 26, 7:46 pm)
Re: [LAU] Lack of smpte support simply sux, Robin Gareus, (Tue Dec 25, 5:12 pm)
Re: [LAU] Lack of smpte support simply sux, Eric Steinberg, (Tue Dec 25, 5:20 pm)
Re: [LAU] Lack of smpte support simply sux, Brett McCoy, (Tue Dec 25, 5:05 pm)