KVR Audio

manducator · Post by **manducator** » Mon Jun 03, 2013 3:11 pm

Hello,

I have a wav file with loduest peaks @ -0.3 dBFS.

When I try to convert it to mp3 (with EZ CD Audio converter), I got clippings up to +0.7 dBFS.

Rednering in reaper with a limiter doesn't help eiterh. How can I render a wav to mp3 without any clippings?

I guess the problem is intersample peaks but how can I avoid them?

Thanks!

Mushy Mushy · Post by **Mushy Mushy** » Mon Jun 03, 2013 3:15 pm

Is this what dither is meant to fix?

tomtoo · Post by **tomtoo** » Mon Jun 03, 2013 3:22 pm

deleted

manducator · Post by **manducator** » Mon Jun 03, 2013 3:23 pm

Mushy Mushy wrote:Is this what dither is meant to fix?

Don't think so, when rendering wav to mp3 in reaper, dither isn't even available.

manducator · Post by **manducator** » Mon Jun 03, 2013 3:28 pm

tomtoo wrote:deleted

Original wav never goes over -0.3 dBFS but mp3 320 kbps reaches +0.7 dBFS...

BertKoor · Post by **BertKoor** » Mon Jun 03, 2013 3:43 pm

Master to WAV with peaks below -1.0 dBfs, then the MP3 will not go beyond 0.0 dBfs

manducator · Post by **manducator** » Mon Jun 03, 2013 3:46 pm

BertKoor wrote:Master to WAV with peaks below -1.0 dBfs, then the MP3 will not go beyond 0.0 dBfs

Yep, I guess that's the solution but I wanted to know if there are other ways.

Mushy Mushy · Post by **Mushy Mushy** » Mon Jun 03, 2013 4:00 pm

manducator wrote:
Mushy Mushy wrote:Is this what dither is meant to fix?
Don't think so, when rendering wav to mp3 in reaper, dither isn't even available.

ok cool.
Sorry mate, I'm clearly an idiot

manducator · Post by **manducator** » Mon Jun 03, 2013 4:11 pm

Mushy Mushy wrote:Sorry mate, I'm clearly an idiot

No you aren't but if you want to know a bit more on dither:

Dither

tibah · Post by **tibah** » Mon Jun 03, 2013 4:16 pm

I had the same thing in REAPER when I imported "professional" tracks as MP3 for comparison. I'm trying to remember if I even had issues importing stuff directly from CD too.

Basically, all of them went into +dB values. You simply get rounding erros. At least, this is what I was told when I asked about it.

Audio~Geek · Post by **Audio~Geek** » Mon Jun 03, 2013 4:23 pm

Another factor is resampling: project at 48kHz with 44.1kHz files.

I mix in REAPER and export 16bit 44.1kHz wav, then drag & drop onto XLD to convert to mp3.

strayboom · Post by **strayboom** » Mon Jun 03, 2013 4:33 pm

i'm not sure what is exactly behind this but it happens because of mp3 compression.
read this, maybe it helps: https://en.wikipedia.org/wiki/MP3

chk071 · Post by **chk071** » Mon Jun 03, 2013 4:38 pm

strayboom wrote:i'm not sure what is exactly behind this but it happens because of mp3 compression.

Sounds weird to me. I never had a problem with that. Maybe try to compress the file with another program, like foobar2000, Winamp or any other player. Just make sure there's no additional effect, equalizer or whatever running. I suspect the program you did it with adds some stuff.

Edit: Could try Audacity too.

strayboom · Post by **strayboom** » Mon Jun 03, 2013 4:50 pm

http://www.soundonsound.com/sos/apr12/a ... lation.htm

Most encoders work by splitting the full-range frequency content into around 32 narrower bands

keywords: digital, 32 band, compressed. it seems, clipping can happen if a frequency range/band is in a 'critical' range. i can't describe it better but the clipping is definetly mp3 compression issue.

chk071 · Post by **chk071** » Mon Jun 03, 2013 5:14 pm

Sounds like this is the only solution then:

BertKoor wrote:Master to WAV with peaks below -1.0 dBfs, then the MP3 will not go beyond 0.0 dBfs

How can I render an wav to mp3 in reaper without clipping?