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Hydrogenaudio Forums > Lossy Audio Compression > MP3 > MP3 - General

PorkOne

Aug 19 2005, 05:04

Hi, I have a question: what is the best nd simpliest way to convert aac file (produced by iTunes, bitrate about 160 and samplerate 48000) to normal mp3 file (bitrate lame standard and samplerate 44100)?
Thanks for help

mixderax

Aug 19 2005, 06:22

Foobar2000

Dilby©

Aug 19 2005, 06:41

Yes, with Foobar2000. You'll need the .mp4/.m4a input component, clienc component, and the LAME exe of your choice. Seems the latest LAME of choice is 3.97a11 --vbr-new. Setup your naming scheme and modify the LAME presets in clienc and away you go.
The information is all here on HA, you just need to be a bit tricky with the search keywords.

PorkOne

Aug 19 2005, 06:47

Foobar + lame is orking, but how to decrase samplerate on the fly? Now I have 48kHz but I want to have 44.1kHz. I can't find this option in lame help

Dilby©

Aug 19 2005, 07:00

Look harder, LAME can resample. Something like --resample 44.1 will give you 44.1Khz samplerate.

QUOTE

http://lame.sourceforge.net/USAGE

=======================================================================
output sampling frequency in kHz
=======================================================================
--resample n

where n = 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48

Output sampling frequency. Resample the input if necessary.

If not specified, LAME may sometimes resample automatically
when faced with extreme compression conditions (like encoding
a 44.1 kHz input file at 32 kbps). To disable this automatic
resampling, you have to use --resamle to set the output samplerate
equal to the inptu samplerate. In that case, LAME will not
perform any extra computations.

PorkOne

Aug 19 2005, 07:32

Great! Thanx guys

LMS

Aug 19 2005, 09:04

Alternatively, you could use the SSRC resampling in Foobar2000 prior to sending the data to the LAME encoder. To do this, you have to include SSRC on your DSP list and check "Use DSP" in the Diskwriter preferences. This has the advantage of allowing you to use the Advanced Limiter in the source decoding, which could be helpful since you are copying from lossy files, which are prone to clipping. Depends on the files you want to transcode, I guess.

Edited: Clarity

NeoRenegade

Aug 19 2005, 11:54

The other advantage to SSRC over LAME's built-in resampling is that it is theoretically of higher quality.

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