[icecast] Auto Archiving function for Icecast.
rsteding at tecwise.com
Wed Apr 24 07:25:20 PDT 2002
A remote dump feature of icecast.
Ok I'll see if I can find any info on the dump feature.
Very clear description. Thanks.
Akos Maroy wrote:
> > Does anyone know how to set up auto-archiving with icecast. I have an
> > encoder coming in with a radio station. I want to create hourly mp3
> > archives of their streams that are coming to my icecast server. Got any
> > ideas?
> I have a set of scripts that do this for me. The idea basically is:
> - encode in 4 hour sessions, that is 6 sessions per day (use 4 hour-long
> darkice recording sessions, and cron to start the new recording every 4
> - use the remote dump feature of icecast to dump the streams in the
> server, each session under a different name. The result is something like:
> - have a script, that at a given time cuts out the last half hour of the
> current stream dump, and call this script from cron every half hour.
> Here the idea is, that from the time point, you can calculate:
> - what is the current dump file called
> - what is the last half hour (e.g. at 10:32 it is 10:00 - 10:30)
> - where is this last half hour in the current dump (e.g. 10:00 - 10:30
> am is in the 3rd session, at offset 2:00 - 2:30, since session 3 is from
> 8:00 - 12:00)
> As you know the bitrate of the stream, you can calculate the byte offset
> and amount of bytes to cut from the dump file (e.g. 128 kb/s stream is
> ((128 / 8) * 60) kB/minute, a half hour section is ((128 / 8) * 60 *
> 1000 * 30) bytes)
> - use dd to cut the desired mp3 data from the current dump, e.g.:
> dd if=session3.mp3 of=1000.mp3 bs=BYTES_PER_HALF_HOUR skip=4 count=1
> where skip=4 tells dd to skip the first 4 half-hour segments
> You can cut with dd if you take care to cut by the mp3 frame boundaries.
> Of course, this only works with fixed bitrate encoding. Also, some mp3
> experts would argue that there will be some mess at the boundries of the
> cut, as mp3 can spread information across several frames.
> Nevertheless, I didn't find a convenient command line mp3 cutting tool
> (didn't look much either, after found this solution with dd)
> Of course, you can simply adjust this pattern to your needs (hour-long
> cuts, different number of recording sessions, etc.)
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