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Converting to Opus: 44.1 kHz resampled to 48 kHz
gurkburk
post Sep 17 2012, 18:40
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So i have a bunch of regular 44100 flac files that i'de like to convert to OPUS file so i have something to listen to when i run, that's not very hard to setup following this guide.
http://www.saunalahti.fi/~cse/Opus/

What does concern me is that opusenc.exe seems to default to a samplingrate of 48000 when you feed it a raw stream (the '-' option as seen in the guide seems to do that) it's easy to see that the .opus files do indeed become converted/upsampled to 48000hz using this method.
So my question is, should i override this behavior by adding --raw-rate 44100 to the encoder?
Does it matter at all that the files get upsampled? Could it introduce noise or other unwanted side effects?

Thanks smile.gif

(yes i know that there aren't many android players yet avail for playback of opus, but the question still remains) smile.gif
Also i think this post belongs to this forums, at least it seemed like it was a good fit, but if i'm wrong please move it :\


This post has been edited by gurkburk: Sep 17 2012, 18:41
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Dynamic
post Mar 15 2013, 18:28
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I think the CELT layer in Opus (possibly not in the old CELT codec) works also at 24kHz sampling rate (12kHz bandwidth) - and this is used at least for the 8-12kHz part of the spectrum in the hybrid mode.

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- gurkburk   Converting to Opus: 44.1 kHz resampled to 48 kHz   Sep 17 2012, 18:40
- - [JAZ]   Opus does not natively support 44Khz. The idea is ...   Sep 17 2012, 19:03
- - LithosZA   QUOTE So my question is, should i override this be...   Sep 17 2012, 19:07
- - Kohlrabi   QUOTE (gurkburk @ Sep 17 2012, 19:40) tha...   Sep 17 2012, 19:08
- - lvqcl   QUOTE (gurkburk @ Sep 17 2012, 21:40) whe...   Sep 17 2012, 19:14
- - benski   how does the internal resampling effect gapless pl...   Sep 17 2012, 19:17
|- - Kohlrabi   QUOTE (benski @ Sep 17 2012, 20:17) how d...   Sep 17 2012, 19:28
|- - benski   QUOTE (Kohlrabi @ Sep 17 2012, 14:28) QUO...   Sep 17 2012, 20:22
|- - Brand   QUOTE (Kohlrabi @ Sep 17 2012, 20:28) Opu...   Sep 17 2012, 20:23
- - Kohlrabi   Apparently I might be wrong, it was deeply rooted ...   Sep 17 2012, 20:26
- - eahm   QUOTE (gurkburk @ Sep 17 2012, 10:40) So ...   Sep 17 2012, 21:12
- - yourlord   I believe I read in another thread that opus can...   Sep 17 2012, 21:27
- - Dynamic   To the OP's question, the resampler in Opus is...   Sep 19 2012, 01:15
|- - NullC   QUOTE (Dynamic @ Sep 18 2012, 17:15) Also...   Sep 19 2012, 05:50
|- - pdq   QUOTE (Dynamic @ Sep 18 2012, 20:15) In a...   Sep 19 2012, 15:26
- - Dynamic   Thanks again for the corrections, NullC. You know ...   Sep 19 2012, 09:00
|- - Brand   QUOTE (Dynamic @ Sep 19 2012, 10:00) I gu...   Sep 19 2012, 09:55
|- - NullC   QUOTE (Brand @ Sep 19 2012, 01:55) EDIT2:...   Sep 19 2012, 14:19
- - Brand   I can reproduce with opusenc+opusdec. In fact opus...   Sep 19 2012, 15:25
- - Case   I'm usually very sensitive to glitches, but I ...   Sep 19 2012, 16:10
- - punkrockdude   Hehe. Gurkburk, du kan inte vara något annat än sv...   Oct 8 2012, 13:25
- - C.R.Helmrich   I have a similar question as the OP. In my case th...   Jan 20 2013, 12:45
|- - nu774   I'm not an "expert" but from what I ...   Jan 20 2013, 16:35
|- - nu774   It might have not been enough explanation... ...   Jan 20 2013, 16:47
|- - C.R.Helmrich   Yes, I expected Opus to resample to 48 kHz interna...   Jan 20 2013, 22:35
|- - nu774   QUOTE (C.R.Helmrich @ Jan 21 2013, 06:35)...   Jan 21 2013, 02:19
|- - jmvalin   QUOTE (C.R.Helmrich @ Jan 20 2013, 16:35)...   Jan 21 2013, 03:55
|- - C.R.Helmrich   Thanks, guys. I'll wait for the 1.1 beta then....   Jan 21 2013, 18:40
- - IgorC   Chris, feel free to submit problematic samples for...   Jan 21 2013, 18:44
- - mzso   Why 48kHz? If the lowpass frequency is 20kHz why ...   Mar 14 2013, 15:55
|- - lvqcl   QUOTE (mzso @ Mar 14 2013, 18:55) why not...   Mar 14 2013, 16:05
- - wswartzendruber   Doesn't the CELT layer work strictly at 48 kHz...   Mar 14 2013, 21:58
- - Dynamic   I think the CELT layer in Opus (possibly not in th...   Mar 15 2013, 18:28
|- - jmvalin   QUOTE (Dynamic @ Mar 15 2013, 13:28) I th...   Mar 15 2013, 18:51
- - Brazil2   Something is still not clear to me: is the interna...   May 29 2013, 08:59
- - saratoga   No, a resampler changes the sampling rate. If the ...   May 29 2013, 14:42
- - Brazil2   That's the theory, but does it *really* behave...   May 29 2013, 16:30
|- - saratoga   QUOTE (Brazil2 @ May 29 2013, 11:30) That...   May 29 2013, 16:53
|- - greynol   QUOTE (Brazil2 @ May 29 2013, 08:30) That...   May 29 2013, 18:01
- - NullC   Thats the problem with these totally opaque closed...   May 29 2013, 19:44
|- - Banned   QUOTE (NullC @ May 29 2013, 20:44) Thats ...   Jun 2 2013, 10:29
|- - skamp   QUOTE (NullC @ May 29 2013, 20:44) Thats ...   Jun 2 2013, 10:54
- - db1989   Yes, I think we can safely deduce that sarcasm was...   Jun 2 2013, 10:58
- - Mardel   For listening test (wav file). If I resample to 44...   Sep 14 2013, 13:08
|- - bandpass   QUOTE (Mardel @ Sep 14 2013, 13:08) For l...   Sep 14 2013, 14:47
- - db1989   You tell us. You even mentioned listening tests. Q...   Sep 14 2013, 14:03
|- - Mardel   QUOTE (db1989 @ Sep 14 2013, 15:03) You t...   Sep 14 2013, 14:13
- - db1989   An assumed condition of double-blind tests is that...   Sep 14 2013, 14:19
- - Mardel   Ok. Thx!   Sep 14 2013, 18:51
- - IgorC   Here is my experience with Opus and handling of a ...   Sep 15 2013, 19:19


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