change dither to none? in quality settings?

[bomber1978]

I don't know how to explain more clearly than I already have...
And I've just had the same happen with a completely different file....

Open the original 16bit/44.1 file.
Highlight the file with the cursor and increase speed +0.1%, go to export and select FLAC..
Dither is SHAPED.
Repeat this except on export save as WAV...
Both exported WAV and FLAC are 16bit / 44.1.
WAV has louder hiss than the FLAC in the silence before the music....
I can hear it in the 3 different programmes I listened with....

[steve]

Open the original 16bit/44.1 file.

How? Drag it into an open project? Open Audacity and select "File > Import > Audio"? Some other way?

When the audio has been imported, in the panel on the left side of the track, does it say that it is 16 bit, 24 bit or 32 bit float?
Is it a mono or stereo track?

and increase speed +0.1%

How? Using the Change Speed effect? or the Transcription Toolbar? or the "Sliding Time Scale / Pitch Shift" effect? Some other way?

go to export and select FLAC..

What file name are you entering? Is it a new unique file name or are you overwriting an existing file?

Dither is SHAPED.

That's in "Edit > Preferences > Quality" ?

Repeat this except on export save as WAV...

With the same file that you imported in step 1? (what was "step 1"?)

WAV has louder hiss than the FLAC in the silence before the music....

When played how? In what program?

If you import the files back into Audacity, do they sound the same?

I can hear it in the 3 different programmes I listened with....

What programs?

I can't see your computer or what you are pressing, so "step by step" really does need to be click by click and key by key if I am to be able to reproduce the same result.

[bomber1978]

*Open Audacity - File - Open - Double click track
Left panel says Stereo 32 bit float.

*Highlight track with cursor from right to left - select Effect - Change speed - in box make % change 0.1 and standard vinyl RPM n/a and n/a, click OK and speed changes....
*File - Export (doesn't matter what name you make it same results, even if you leave the original name and just add.wav) eg. I just used the name "+0.1 increase.wav", then click save, file will save....
*yes Dither is still set to Shaped in Edit - Preferences - Quality.

Repeat exactly as above but save as FLAC not WAV. Both outputs are definitely 2stereo 16bit/44.1.

Playback in Audacity, Adobe Audition 1.5 and GoldWave all have the louder hiss in the WAV.

[steve]

Try this:
1) Open Audacity.
2) Generate menu > Silence. Generate 6 seconds of silence.
3) Export as silence1.flac (Click the "Options" button to ensure that the FLAC exporter is set to 16 bit).
4) Export as silence2.wav (16 bit Microsoft PCM WAV)
5) Play the exported files - do you hear a difference in the amount of hiss?
6) Close and restart Audacity.
7) Import silence1.flac and silence2.wav into Audacity.
8) Ctrl+A (select all)
9) Effect > Amplify. Apply the "Amplify" effect with the default settings.
Do both tracks show the same amount of noise?

[bomber1978]

Hi,

Going through the process you listed produces 2 files which seem to have the same amount of hiss to me...., the WAV and FLAC seem to be the same...

However I just downloaded Audacity on a completely different computer (PC not my laptop), and doing the exact process' I have previously described
also produced the WAV with more hiss than the FLAC.
I have notcied the hiss in the WAV doesn't seem quite as loud on the PC as my laptop, it's definitely quiter on the PC, however still more than the FLAC, I then transferred the files made on my PC to my laptop and when played on my laptop the hiss in the WAV produced on my PC is exactly as loud as the WAV produced on my laptop, so the loudness of the hiss seems different whether played on my laptop or PC, however on both PC and laptop the WAV hiss is still louder than the FLAC.

I'm listening full volume with earphones...
Here's the first 3 seconds of the FLAC:
http://www.4shared.com/file/eyy4msHP/01 ... _SHAP.html

Here's the first 3 seconds of the WAV:
http://www.4shared.com/music/JW_0dyqh/0 ... d_SHA.html

[steve]

Going through the process you listed produces 2 files which seem to have the same amount of hiss to me...., the WAV and FLAC seem to be the same...

So it's over to you. Tell me how to reproduce the difference that you are hearing,
If it requires importing a file, please upload that file somewhere on the Internet so that I can download it and reproduce your results.

[bomber1978]

Hi,
The process is as I posted 2 posts ago, I think I have included every detail....
I got the same results with 2 other songs I saved from an album, seems to be that as long as there is silence before the track the WAV will have louder hiss...
For example, it happens with this original file:
http://www.sendspace.com/file/xxwkqs

*Open Audacity - File - Open - Double click track
Left panel says Stereo 32 bit float.

*Highlight track with cursor from right to left - select Effect - Change speed - in box make % change 0.1 and standard vinyl RPM n/a and n/a, click OK and speed changes....
*File - Export (doesn't matter what name you make it same results, even if you leave the original name and just add.wav) eg. I just used the name "+0.1 increase.wav", then click save, file will save....
*yes Dither is still set to Shaped in Edit - Preferences - Quality.

Repeat exactly as above but save as FLAC not WAV. Both outputs are definitely 2stereo 16bit/44.1.

Playback in Audacity, Adobe Audition 1.5 and GoldWave all have the louder hiss in the WAV.

[steve]

I don't have an account with 4shared but it won't let me download the file without.
Could you upload the file somewhere that registering is not required (for example sendspace.com) or alternatively is it possible to reproduce the problem using generated tones?

[bomber1978]

Hi,
I've replaced the link with a SendSpace link.

[steve]

I've replaced the link with a SendSpace link.

Thanks. Got it.

Steps:

1. Launch Audacity (new project)
2. Preferences > Quality:
   Default sample rate: 44100
   Default sample format: 32 bit float
   High quality conversion: High quality / shaped.
3. Preferences > Import export:
   Read uncompressed directly ... (faster)
4. File > Import > Audio: The Cure - 01 - Pictures of You.flac
5. Ctrl+A (select all)
6. Effect > Change Speed: Percent change = 0.1
7. File > Export: File format Flac (16 bit, level 5), Name: "flack-test"
8. File > Export: File format WAV (Microsoft PCM signed 16 bit), Name: "wav-test"
9. File > Close: Save Changes = No (Project closes and a new project window opens.
10. File > Import > Audio: Select "flac-test.flac" and "wav-test.wav" (the two files are imported).
11. Select the first 2 seconds in both tracks.
12. Ctrl+T (trim)
13. Select the flac-test track and "Export Selection" as: File type: other uncompressed format, WAV (Microsoft), 32 bit float, name: "flack-test-export.wav"
14. Select the wav-test track and "Export Selection" as: File type: other uncompressed format, WAV (Microsoft), 32 bit float, name: "wav-test-export.wav"
    (32 bit float export is bit for bit identical to the data in the Audacity project).

These are the two files:

flac-test-export.flac

(689.3 KiB) Downloaded 85 times

wav-test-export.wav

(689.3 KiB) Downloaded 69 times

As expected, they are not bit-for-bit identical (because dither includes a random element), but as far as I can tell they are otherwise the same - no difference in the amount of hiss. The peak level for the first 0.5 seconds in both tracks is -72.2 dB (as expected for 16 bit shaped dither).

So what did I do different? How do I reproduce your results?