[opus] Opus File Format

Simon G4ELI/HB9DRV simon at sdr-radio.com
Wed Feb 27 02:45:08 PST 2013



That's the sort of approach. At the moment I can record with WMA although I
do see a demand for recording with a format as described below, so I'll have
to write my own player (Windows only).





From: Benjamin Schwartz [mailto:benjamin.m.schwartz at gmail.com] 
Sent: 27 February 2013 08:11
To: Ian Malone
Cc: Simon G4ELI/HB9DRV; opus at xiph.org
Subject: Re: [opus] Opus File Format


If I were doing this, I would make each frequency switch a "chain boundary".
This is analogous to having the overall stream actually be a playlist of
consecutive streams, each representing one segment in which the radio
channel was constant.  Then each segment can easily be tagged with the
frequency of the channel.  You can do this using Ogg Vorbis or Ogg Opus


On Tue, Feb 26, 2013 at 9:33 AM, Ian Malone <ibmalone at gmail.com> wrote:

On 26 February 2013 12:50, Simon G4ELI/HB9DRV <simon at sdr-radio.com> wrote:

>> I don't know whether Opus can continually vary frequency (though I don't
think so, it's very rare for
>> audio formats), but communicating that is obviously something the codec
would need to specify.


> Sorry - I wasn't clear, what I would like to do with any future Opus file
format is have a tag such as Title which can be continually updated
throughout the recording, not fixed at the start. Obviously I could design
my own storage format for this, but it always makes sense to 'go with the
flow' so to speak.
> In my case these are radio recordings, so I would add my own custom tag
'Radio Frequency' and update this as the user changes the radio's frequency.

Ah, I completely misunderstood that example then. I've never tried it,
but Kate should be able to do that as metadata:
http://wiki.xiph.org/Kate#Metadata particularly you can apply it to a
time range, which is probably what you want when tagging something
like radio frequency rather than an instantaneous label.


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