Lame MP3 Encoding on Linux

Staz · 16th December 2006, 02:01

Hi I am wanting to encode my DVD audio track to lame mp3.
This is the mencoder setting I use to rip the audio.

Code:

mencoder -dvd-device . dvd:// -aid <aid> -oac copy -of rawaudio -ovc copy -o test.ac3

But when I try to encode to mp3 using lame my result is a terrible screeching sound. Why is this? Also when lame is encoding the total frames is far less than it should me. eg : 24300/26094. There are far more frames than 26094 in the movie.

Code:

lame -V 5 --vbr-new test.ac3 test.mp3

I then tried using mencoder to output the audio track to PCM .wav

Code:

mplayer -dvd-device . dvd:// -vo null -vc dummy -ao pcm:file=output.wav

Then used lame again:

Code:

lame -V 5 --vbr-new output.wav test.mp3

The result actually sounded really good, but it was far quieter rips I have done on windows using robot4rip. Why is this? Also I heard that lame doesn't like to convert a 48khz source. Is this true? What is the best way to boost the audio on linux (get the optimal gain setting). I notice besweet has a -ota (-hybridgain) switch. What does this do and how can I closely replicate it on linux?

Thanks
Staz

shevegen · 16th December 2006, 06:58

Yeah not sure why there is a screech but i have it also sometimes

i am using ffmpeg directly these days to get the audio from a DVD
especially if its already a .mp3 file

if its wav though, lame works always for me

d'Oursse · 17th December 2006, 07:06

why don't you tell mencoder to convert your audio track directly to wav, instead of ac3 ?

echo · 17th December 2006, 14:25

Lame does not accept ac3 as input. That's why you're getting the screeching sounds and you have less frames. Always export to wav and then encode with lame as you did in your second try. And yes it's true that lame is tuned for 44.1kHz material but works OK for 48kHz too. You could also use mp3gain to boost the volume without clipping the audio.

Staz · 18th December 2006, 01:07

I have been getting perfect results by exporting to .wav with mencoder, encoding to vbr mp3 with lame and then by using the following command in mp3gain:

Code:

mp3gain -r -k

I get the maximum gain possible without any clipping at all! Thanks everyone

JVz · 2nd January 2007, 17:20

Have you considered using MPlayer's built-in LAME support instead?

lpn1160 · 13th January 2007, 23:16

mplayer dvd://1 −alang en −dumpaudio −dumpfile audio.ac3 && ffmpeg -i audio.ac3 audio.wav && lame --abr 192 audio.wav

exit 0
clear

16th December 2006, 02:01	#1 \| Link
Staz Registered User Join Date: May 2004 Posts: 128	Lame MP3 Encoding on Linux Hi I am wanting to encode my DVD audio track to lame mp3. This is the mencoder setting I use to rip the audio. Code: mencoder -dvd-device . dvd:// -aid <aid> -oac copy -of rawaudio -ovc copy -o test.ac3 But when I try to encode to mp3 using lame my result is a terrible screeching sound. Why is this? Also when lame is encoding the total frames is far less than it should me. eg : 24300/26094. There are far more frames than 26094 in the movie. Code: lame -V 5 --vbr-new test.ac3 test.mp3 I then tried using mencoder to output the audio track to PCM .wav Code: mplayer -dvd-device . dvd:// -vo null -vc dummy -ao pcm:file=output.wav Then used lame again: Code: lame -V 5 --vbr-new output.wav test.mp3 The result actually sounded really good, but it was far quieter rips I have done on windows using robot4rip. Why is this? Also I heard that lame doesn't like to convert a 48khz source. Is this true? What is the best way to boost the audio on linux (get the optimal gain setting). I notice besweet has a -ota (-hybridgain) switch. What does this do and how can I closely replicate it on linux? Thanks Staz

16th December 2006, 06:58	#2 \| Link
shevegen Registered User Join Date: Nov 2003 Posts: 420	Yeah not sure why there is a screech but i have it also sometimes i am using ffmpeg directly these days to get the audio from a DVD especially if its already a .mp3 file if its wav though, lame works always for me __________________ OS: Paldo (Linux) AviSynth for Linux, go go go!

18th December 2006, 01:07	#5 \| Link
Staz Registered User Join Date: May 2004 Posts: 128	I have been getting perfect results by exporting to .wav with mencoder, encoding to vbr mp3 with lame and then by using the following command in mp3gain: Code: mp3gain -r -k I get the maximum gain possible without any clipping at all! Thanks everyone

17th December 2006, 07:06	#3 \| Link
d'Oursse Mushroomeur Join Date: Jun 2003 Location: Mushrooms of Paris Town Posts: 267	why don't you tell mencoder to convert your audio track directly to wav, instead of ac3 ?

17th December 2006, 14:25	#4 \| Link
echo Registered User Join Date: Jan 2003 Posts: 130	Lame does not accept ac3 as input. That's why you're getting the screeching sounds and you have less frames. Always export to wav and then encode with lame as you did in your second try. And yes it's true that lame is tuned for 44.1kHz material but works OK for 48kHz too. You could also use mp3gain to boost the volume without clipping the audio.

2nd January 2007, 17:20	#6 \| Link
JVz Registered User Join Date: Dec 2006 Location: Chicago Posts: 3	Have you considered using MPlayer's built-in LAME support instead?

13th January 2007, 23:16	#7 \| Link
lpn1160 open source geek Join Date: Jun 2003 Location: global Posts: 76	mplayer dvd://1 −alang en −dumpaudio −dumpfile audio.ac3 && ffmpeg -i audio.ac3 audio.wav && lame --abr 192 audio.wav exit 0 clear