[cma-l] Chronicle ROT Logger Beta

Sat Mar 4 23:13:05 GMT 2017

I think my only point about file size is to answer the question "how large
a hard drive should I have?" If you wanted the answer - a 750GB hard drive
should be enough.

Since this software is there to run a legally-required service, the last
thing you want it to do is to silently fail due to a lack of disc space.

The "never delete" archive comment - I can't see any requirement to stream
directly to S3 (and as you say, it's virtually impossible anyway). I'd run
an hourly, daily or weekly cron job to upload the files - which you might
want to ensure are in sensible folder structure (/2017/03/12/0400-0500.wav)
so you don't end up with an unweildy file list. Using a separate cron job
is less likely to hurt the recording process, I'm assuming.

Transferral to Amazon Glacier, incidentally, can be set to automatically
happen after a period of days with AWS. (For those reading along - Glacier
is an even cheaper place to dump your files, with the drawback that if you
want them, you need to request them and they take about four hours to
become available).

This is good stuff - I'm sure that logging has been re-invented many times,
but anything that is free and simple to use (and, most importantly, open
for others to improve) is a good thing in my book!

//j

On Sat, 4 Mar 2017, 19:43 Alex Gray <tlr at gairloch.co.uk> wrote:

If you select fixed rate (CBR) MP3 coding, then file sizes are pretty
constant.  We play out most material at 256kbps, and an hour's programme is
about 112MB, and the player's time to run display is accurate.

But if instead you select variable rate (VBR) encoding the rate is adaptive
to the material, and file length becomes variable according to content.
Also a player's time to run display becomes only approximate, which is a
big disadvantage for studio use.

Alex

But some people use

On 4 Mar 2017 08:46, Tony Bailey <ravensound at pilgrimsound.co.uk> wrote:

Correction: should read "mp3 files are always the same size"

Hello all,

I've no idea what this thread is all about - just one item caught my eye:
file lengths - I've been playing around with an audio chunk upload using
arecord with fixed file lengths and the mp3 files are always the same
length, the ogg files vary according to content however.

Tony Bailey

On 03/03/17 19:58, mail wrote:

Hi James,

Thank you! That's really kind of you :D

With regard to #1:
Being able to show a projected file size for a file of a given length,
channel count, bitrate, etc is fairly straightforward for uncompressed
files (such as WAV). The default settings (16-bit, 44.1kHz, stereo)
recording for an hour will always produce a file of ~605MB. Compressed
formats, however, are harder to predict given that the compression ratio
overall depends on the content of the audio. Still, it shouldn't vary too
much and a rough average figure should be sufficient - just not *perfectly*
accurate.
See https://github.com/calmcl1/chronicle/issues/22.

#2
Not deleting archives automatically is fine (see
https://github.com/calmcl1/chronicle/issues/21) if you want to manage your
archives directly, but a direct upload to S3 will take a little work, as
one can't *stream* directly to S3 and must instead upload short chunks. Not
impossible, though :)

Unfortunately, a direct Glacier upload isn't possible as one must know the
*exact* file size before starting - you'd have to wait for it to complete
and then upload.

Cold-storage/nearline archiving like this would be better implemented by
logging to a given directory and then running an automated hourly/overnight
backup operation to Glacier. I've actually got some software for that, too,
called Cupo (github.com/calmcl1/cupo-backup), but that's still quite beta
(though we do use it for our Myriad database backups at HCR).

Does this help, or have I missed the point entirely?

Cal

m: 07426 437449 e: mail at callum-mclean.co.uk w: callum-mclean.co.uk

---- On Fri, 03 Mar 2017 08:08:00 +0000 *James Cridland
<james at cridland.net> <james at cridland.net>* wrote ----

This is nice - have tweeted it and it'll be in my newsletter.

Suggestion #1 is to make it clear how much space this will take on a local
drive.

Suggestion #2 is to archive to Amazon S3 or similar (or point to a cron job
that will do this for you). Please don't delete archives - instead, Amazon
Glacier will be a really cheap place to store every single second of your
radio station that was ever broadcast. Imagine how awesome that would be.

J

On Thu., 2 Mar. 2017, 19:19 Canalside's The Thread, <office at thethread.org.uk>
wrote:

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I’ll get our tekky guys Simon and Blackers onto this Cal …… might be worth
a dabble and a play. I think they’ve got bored of our Train set now and
need a new Toy to tinker with        J        LOL

Nick H Dumpty / Head Bottle Washer

Canalside Calamity Radio

*From:* cma-l-bounces at mailman.commedia.org.uk [mailto:
cma-l-bounces at mailman.commedia.org.uk] *On Behalf Of *Cal McLean
*Sent:* 01 March 2017 22:55

*To:* The Community Media Association Discussion List <
cma-l at mailman.commedia.org.uk>
*Subject:* [cma-l] Chronicle ROT Logger Beta

Hi all,

Forgive the shameless-self-promotion post - I was wondering if anyone in
the CMA might be willing to try out a bit of software that's currently in
beta (though stable enough for production use)?

As part of Halton Community Radio's upgrade, I ended up writing an ROT
logger, since none of the options available to use particularly seemed to
be good value for what we needed. It's now running on a hand-built computer
in our production environment!

However, I always feel with the bits of software that I write that if they
can be useful to me, perhaps they can be useful to other people. If anybody
might want to play-test a bit of logging software, it's available at:

<https://calmcl1.github.io/projects/chronicle>
https://calmcl1.github.io/projects/chronicle

The link above has much more information about the state of the software,
how it came about and what I'm intending to do with it. It's all open
source on GitHub, so developer types are free to modify and play as they
wish :)

Cal McLean

*Head Technician *Halton Community Radio
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