Old 17th February 2012, 13:19   #1
joe@joes.com
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Disk Writer bug alters pitch and tempo in mp3 conversion

I have tried using Nullsoft Disk Writer v2.14 in Winamp 5.623 on Windows 7 to convert files to mp3 with several input formats (CD and mp3) and several output "formats" ("Lame MP3" and "MPEG Layer-3").

Any conversion results in a shortening of the file duration and a corresponding increase in pitch/tempo.

A test with a 3:00 input file resulted in a 2:46 output mp3 file and a slightly "chipmunked" voice, for instance.
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Old 4th October 2012, 09:20   #2
MedNZ
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I have the same problem - same versions of the app and Disk Writer but running WinXP. Had the problem a couple of years back. Thought it would be fixed by now but encountered it again today.

Why has this issue not been addressed nor the OP replied to in half a year?!
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Old 10th October 2012, 09:55   #3
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Yeah! I'm getting no love here! Thanks, MedNZ.
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Old 10th October 2012, 13:50   #4
ujay
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Hi Joe,

Disk writer is a bit old school these days.
Problem is that it can only use the codecs available through Windows and not the nullsoft/3rd party ones included with Winamp.

From the timings you gave this looks like the ratio between 48000Hz and 44100Hz so maybe it's mixing up the old Red Book and DVD standards.

Best method is to use the ripper for CDs and Send to > format converter for mp3 files. Don't think there are any problems with that.

If you absolutely have to use Diskwriter then save as PCM(WAV format) and then use format converter on them.

UJ
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Old 22nd October 2012, 03:50   #5
MedNZ
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Solution for ripping to Lame MP3

This is correct
Quote:
Originally Posted by ujay View Post
From the timings you gave this looks like the ratio between 48000Hz and 44100Hz so maybe it's mixing up the old Red Book and DVD standards.
However...
Quote:
Originally Posted by ujay View Post
Best method is to use the ripper for CDs and Send to > format converter for mp3 files. Don't think there are any problems with that.

If you absolutely have to use Diskwriter then save as PCM(WAV format) and then use format converter on them.
No need to use the CD ripper, nor save them as PCM then do even more work converting them.
Just choose any 44,100Hz option (as opposed to 48,000Hz as standard/default) in the conversion pulldown menu (where you select the bitrate etc) and it will work perfectly.

Here is the full path: Winamp Preferences >>> Nullsoft Disk Writer (version x.x) Settings >>> Conversion >>> Convert to format: (checked) >>> *Press large button and popup window appears* >>> Sound Selection >>> Attributes.

Attributes has the pulldown menu where there are choices from 8000Hz up to 48,000Hz (which the default seems to be set at and also why we encounter the problem). If you want, say 256kbps MP3, then choose 256kBit/s, 44,100 Hz, Stereo from the pulldown.
Note: 256kBit/s, 48,000 Hz, Stereo will give you the increase in pitch/tempo.
Also note that on the Sound Selection popup, Format is set to Lame MP3, not MPEG Layer-3
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Old 22nd October 2012, 07:13   #6
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My apologies. The full path was not quite specific enough (for those who might not be familiar with Winamp settings, anyway). Here it is since I cannot edit my post;

Winamp Preferences *Ctrl+P* >>> Plug-ins >>> Output >>> Nullsoft Disk Writer (version x.x) Settings *Double-click on Nullsoft Disk Writer (version x.x) [out_disk.dll]* >>> Conversion >>> Convert to format: (checked) >>> *Press large button and popup window appears* >>> Sound Selection >>> Attributes
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Old 22nd October 2012, 08:19   #7
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But be aware that if you do that, you will be using Microsoft's Built-In Sample Rate Converter which ships with Windows since Version 3.11....

And the quality is crappy. It just does a quick and dirty resampling without any "anti-aliasing" or "anti-imaging" filter. Under certain circumstances, the result can be a file with ringing noises in the background.

It's really the better way to use [Right-click on the playing song title] -> [Send to>] -> [Format Converter] and then select the desired output format.

This will use the output codec's resampling algorithm (if needed), which is almost always better than the Windows one.

And moreover, it only does any Sample Rate conversion if it is really necessary. For example, if you convert a 48 kHz WAV file to MP3, you will get an MP3 file with 48 kHz sample rate, which is absolutely perfect and no problem. You will not have any time-domain signal alteration due to resampling.

Just wanted you to know!
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Old 23rd October 2012, 05:31   #8
MedNZ
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Typical of Micro$oft. Thanks for the heads up, kzuse.

So am I correct in understanding that using anything other than 48kHz (via Nullsoft Disk Writer) will initiate Microsoft's Built-In Sample Rate Converter?

And is there any way to do a whole album at once via Format Converter rather than doing each track individually? TIA
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Old 23rd October 2012, 08:00   #9
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More precisely:
The MS Sample Rate Converter is initiated if the target sample rate (which you select in the "convert to format" box) does not match the sample rate of the source file.

Common sample rates of source files are 44.1 kHz for Audio CDs, and 48 kHz for DVDs or digital Television / digital Radio broadcasts.

And yes, you can select a whole bunch of files in the Media Library or the Playlist at once, and then right click and "Send to" -> "Format converter".
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