Opus is now RFC6716, version 1.0.1 released! Options

[xiphmont]

"Mozilla and the Xiph.Org Foundation are pleased to announce the Internet Engineering Task Force (IETF) has standardized Opus as RFC 6716. Opus is the first state-of-the-art, fully Free and Open audio codec ratified by a major standards organization."

Full announcement at xiph.org/press/2012/rfc-6716

Yay!

This post has been edited by Frank Bicking: Sep 11 2012, 20:46

Reason for edit: Fixed URL.

[Anakunda]

I've got this wish if some developer could write a directshow filter for opus...I find this ideal codec and bitrates for secondary tracks (commentary and similar)....
http://www.xiph.org/dshow/

What is the higest input bit depth?



This post has been edited by Anakunda: Oct 1 2012, 10:49

[lvqcl]

What is the higest input bit depth?

foobar2000 already has built-in preset for Opus.

[Yakov]

What is the higest input bit depth?

foobar2000 already has built-in preset for Opus.

When encoding with Opus in foobar2000, what is the default export sampling rate? opusenc.exe defaults to 48 KHz so I assume it uses this. If the input is 24-bit 96 KHz is that would I'd end up with? How would I change bit depth and sampling rates in foobar?

[saratoga]

What is the higest input bit depth?

foobar2000 already has built-in preset for Opus.

When encoding with Opus in foobar2000, what is the default export sampling rate? opusenc.exe defaults to 48 KHz so I assume it uses this. If the input is 24-bit 96 KHz is that would I'd end up with? How would I change bit depth and sampling rates in foobar?

It should use whatever sample rate you feed it. IIRC opusenc does this as well.

[Yakov]

When encoding with Opus in foobar2000, what is the default export sampling rate? opusenc.exe defaults to 48 KHz so I assume it uses this. If the input is 24-bit 96 KHz is that would I'd end up with? How would I change bit depth and sampling rates in foobar?
[/quote]

It should use whatever sample rate you feed it. IIRC opusenc does this as well.
[/quote]

Really? I don't think that 3mb was 24-bit 96 KHz. Is there a way to find out what an opus file is, in terms of bit rate, bit depth, sampling rate, etc.?

Aw, I messed up the quoting didn't I? How do I not do that?

This post has been edited by Yakov: Oct 11 2012, 04:29

[saratoga]

Really? I don't think that 3mb was 24-bit 96 KHz. Is there a way to find out what an opus file is, in terms of bit rate, bit depth, sampling rate, etc.?

Internally sampling rate is always 48k, but I believe it will be resampled back to 96k in foobar (haven't tested this though so I might be wrong). Bitrate depends on your settings, you can check the result in foobar.

Only PCM files have a bit depth, not lossy formats like Opus.

Edit: Just tested and doing 44.1k Wav > Opus results in an opus file with SAMPLERATE_ORGINAL set to 44.1k as expected. Decoding that file in foobar without specifying a resampler does output a 48k WAV file however.

This post has been edited by saratoga: Oct 11 2012, 05:10

[Dynamic]

Edit: Just tested and doing 44.1k Wav > Opus results in an opus file with SAMPLERATE_ORGINAL set to 44.1k as expected. Decoding that file in foobar without specifying a resampler does output a 48k WAV file however.

Yup, this came up in a thread about fb2k Opus behaviour before. fb2k's internal architecture is geared to playback, where 48kHz is the sensible choice for Opus (and the incoming sample rate may get changed mid-stream quite legitimately, especially for streaming).

I don't think fb2k's Converter dialog yet includes an option to automatically resample Opus back to original sample rate by passing that data forward, but it's feasible in future.

In the mean time, you need to manually resample to the required rate.

I don't think there's any user option for conditional DSP use in the Converter based on values in the file or stream properties (e.g. set Resampler (PPHS) to SAMPLERATE_ORIGINAL when that value is present in the current file)


P.S. With quoting, you need to delete after the tag that looks a bit like
[ quote name='blahblah' date='Oct 11 2012, 09:45 post='987654']
to keep it inside a quote box, and don't delete the [ /quote] tag at the end either. A quote needs a starting tag and a closing tag with a forward slash.

If the person you're quoting had quoted someone else and you don't need the quote-within-a-quote, you can select from the start of the second [ quote] to the end of the first [ /quote] and delete it.