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Recent Posts
1
General Audio / Re: Order: Changing sampling format and sampling rate of Audio.
Last post by bennetng -
https://izotope-rx.livejournal.com/4971.html
You can see how resampling can change, and especially, increase the amplitude of a signal, as well as adding intermediate amplitude values. Since integer (8/16/24 bits) formats will clip any signal beyond 0dBFS, you need to convert to floating point BEFORE resampling to prevent this to happen. If a specific program does not support float, then you need to have some speculation about potential clipping, and apply a negative gain to the signal prior to resampling. If you do this, you still need to increase the signal to a higher integer bit-depth to minimize quantization error BEFORE applying a negative gain.

For 16/44.1 to 32/48, if the 32 is float, there is no way to dither because dithering relies on fixed quantization steps, but floating point formats don't use fixed quantization steps. If the 32 is integer, some software may still allow dithering, but not all software offer this option as it is unimportant anyway, the quantization error in this bit-depth is too small to begin with.
2
Support - (fb2k) / Re: FB 1.6.7 crashes on MS Remote Desk connection (and sometime disconnection)
Last post by AndreaT -
I can't replicate a crash by using RDP to connect to a playing machine. I can make playback stop to an error but that's it.

Please submit crashlogs if you see crashing. Or if the crash bypasses the crash submission, provide further details how to replicate the issue. In those cases take a look at Windows' Event Viewer and see the Application log. It might pinpoint the cause of the crash.

Thank you @Case , I submitted all the crash logs I had.
Kindly be aware that my Foobar is running on a Win 10 32bit PC.
Regards, Andrea
3
General Audio / Re: When you rip Vinyl records to FLAC how do differentiate them from CD rips?
Last post by pr0m3th3u5 -
[...]  I'd still keep 44.1/16 or *maybe* 24 for final output, though. And I'd keep the multi-stage RX project files that maintain the full revision history of the work going back to the initial recording. Those come out to about 2.5-3GB per side.

If I a may ask why 44.1kHz instead of 48kHz? I mean most sound cards convert to 48kHz right?
4
General Audio / Re: Order: Changing sampling format and sampling rate of Audio.
Last post by pr0m3th3u5 -
Suppose you want to convert a 24/96 file to 16/44.1...
1. Convert to a higher bit-depth (e.g. 32/64-bit float)
2. Resample to 44.1k
3. If the resampling process introduced sample values beyond 1.0 (0dBFS), apply a negative gain
4. Dither
5. Convert to 16-bit

Intermediate steps are all done in the highest possible bit-depth supported by the application's internal data path to minimize quantization error, and to prevent clipping.



What if I want to convert from 16/44.1 to 32/48 ? Should I follow the same method? Also what you said seems to conflict with Andy who says do the sample rating conversion first!

Your post of explaining the use of dither is very helpful thank you!
6
Support - (fb2k) / Re: Bug report: incorrect sorting for this track
Last post by Rollin -
By the way, this behavior of Mp3tag affects not only Track Number in Vorbis Comments but also Disc Number.
Problem also happens with Disc Number in APEv2, but for other reason: Mp3tag uses "Discnumber" for Disc Number in APEv2 instead of recommended "Disc"
Here is script for foo_masstag to rewrite Track Number/Total Tracks and Disc Number/Total Discs if they have "/"
7
Opus / Re: Nontransparent example at 231kbps
Last post by amariami -
hmmm... you might need to read an article about it ;)
https://www.sounddevices.com/sample-32-bit-float-and-24-bit-fixed-wav-files/
Before you believe you have a "very" deep understanding of floating point by merely pointing to that Sound Devices article, better read this first:
https://www.audiosciencereview.com/forum/index.php?threads/zoom-f6-portable-field-recorder-review.15668/post-507610

The fact is floating point is merely marketing nonsense in the context of these field recorders, and the real world measured performance is pretty poor.
https://www.audiosciencereview.com/forum/index.php?threads/zoom-f6-portable-field-recorder-review.15668/

Even after updating firmware:
https://www.audiosciencereview.com/forum/index.php?threads/zoom-f6-portable-field-recorder-review.15668/post-786854

Also, try my software:
https://hydrogenaud.io/index.php?topic=114816.msg992983#msg992983

To conclude, you simply used a different encoding scheme (CVBR) to reduce the bitrate, and the whole thing is irrelevant to dithering at all, in the context of my posted test files.
thanks you anyway
10
Opus / Re: Nontransparent example at 231kbps
Last post by bennetng -
hmmm... you might need to read an article about it ;)
https://www.sounddevices.com/sample-32-bit-float-and-24-bit-fixed-wav-files/
Before you believe you have a "very" deep understanding of floating point by merely pointing to that Sound Devices article, better read this first:
https://www.audiosciencereview.com/forum/index.php?threads/zoom-f6-portable-field-recorder-review.15668/post-507610

The fact is floating point is merely marketing nonsense in the context of these field recorders, and the real world measured performance is pretty poor.
https://www.audiosciencereview.com/forum/index.php?threads/zoom-f6-portable-field-recorder-review.15668/

Even after updating firmware:
https://www.audiosciencereview.com/forum/index.php?threads/zoom-f6-portable-field-recorder-review.15668/post-786854

Also, try my software:
https://hydrogenaud.io/index.php?topic=114816.msg992983#msg992983

To conclude, you simply used a different encoding scheme (CVBR) to reduce the bitrate, and the whole thing is irrelevant to dithering at all, in the context of my posted test files.
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