Public bug reported:
>From the man page:
The "-f" option is used when you create additional recovery data.
e.g. If you have already created 10% and want another 5% then you migh
use the following command:
par2 create -s307200 -r5 -f300 test.mpg
This specifies the same block size (which is a requirement for addi‐
tional recovery files), 5% recovery data, and a first block number of
300.
Spelling of 'migh' aside, having to calculate the exact block number is
a hassle on the user. They need to find the last par2 file, calculate
the sum, and then specify it (and it's unclear whether the argument
should be the sum, or the sum+1; I still don't know).
If one is adding *additional* redundancy, then there must be existing
par2 files; why cannot par2 look for the existing ones and figure out
the next block number and appropriate parameters? It's quite mechanical
and tedious on the part of the user, especially if they've misguessed
the right percentage and need to add additional redundancy to multiple
directories of par2 files.
** Affects: par2cmdline (Ubuntu)
Importance: Undecided
Status: New
--
par2 requires block number when adding additional redundancy; could figure it
out for itself
https://bugs.launchpad.net/bugs/535314
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