[ardour-users] maximum session length?

Ichthyostega prg at ichthyostega.de
Sun Aug 20 15:58:52 PDT 2006

Hash: SHA1

> On Sun, 2006-08-20 at 19:46 +0200, Ichthyostega wrote:
>> is there some sort of maximum length of timeline ardour can handle?
>> Or ist there some known problem with sessions lasting several hours?

Paul Davis schrieb:
> ardour 0.99 uses WAVE or Broadcast WAVE files to capture audio. This
> format has an inherent limit on their size because of the definition of
> the format. how long this limit in terms of wall clock time depends on
> the sample rate. i wish i could recall the limit but its not in my head
> right now.
> ardour 2.0 now offers the chance to use WAV64 (or CAF, a new Apple
> format) for captured audio, which has a 64 bit size limit, effectively
> limitless. 
> we will not fix this in ardour 0.99, because the work to use a better
> format has already been done there.
Thats a good decision!

> in addition, there is the problem that JACK uses an unsigned 32 bit
> integer for sample counts, which imposes a similar limit as with WAV/BWF
> files. this is what limits the session itself (rather than specific
> audio files). i can't comment yet on what we will do about this - it
> was, in retrospect, a mistake not to use a 64 bit value there right from
> the start of JACK's life.

Hello Paul,
thank you for your quick response. Then probably I got biten by the second
issue, the unsigned 32 bit sample count in the session!

So for the next time -- at 96kHz and 32bit Broadcast WAVE we have
to live with the following two limits:

uninterrupted recording........about 1h 25min
maximum timeline length........about 11h 30min

Normally, I think, this shouldn't really be a problem ;-)
Many thanks for this great software -- and: I am looking ahead
at using Ardour-2

Hermann Vosseler

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