[LAU] Long-running jack_capture multi-track recording corruption?

Robin Gareus robin at gareus.org
Sat Apr 3 18:53:14 CEST 2021

On 4/3/21 6:24 PM, David Kastrup wrote:
> Andrew Grathwohl <andrew at grathwohl.me> writes:
>> Hi list,
>> I am using jack_capture to record 2 inputs and 20 outputs going
>> through SuperCollider for a duration of between 30-45 minutes, using
>> the following command line:
>> jack_capture -f wavex -p supernova:* test.wav
>> This has worked well for my use case for several years. However, since
>> yesterday this command line fails to capture the entire recorded
>> performance, despite jack_capture showing the meters responding to the
>> audio correctly. Whenever the recording duration exceeds approximately
>> 20 minutes, the output file will only contain the first 5-10
>> minutes. However, if we only do a 5-10 minute recording, the entire
>> recording is captured and saved properly.
> Sounds like a file size problem?  Something like a 2GiB or 4GiB related
> limitation?
> Have you changed file systems?

also try `jack_capture -f w64 -b 16 ...`

By default jack-capture writes 32-bit float (4 bytes/sample). At 48kHz
sample-rate, 22 channels you reach the 2^31 samples after 8'29".


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