IPB

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
Mono MP3 to Stereo
d6mck
post May 16 2007, 22:51
Post #1





Group: Members
Posts: 1
Joined: 16-May 07
Member No.: 43534



Much I as would not normally touch transcoding with a bargepole, my beloved MP3 player (an Archos GMini XS202S) has a problem with playing mono MP3s (specifically, downloaded podcasts from New Scientist).

I've tried to re-encode using Foobar2000 and LAME, but any -m option appears to be ignored, and I end up with mono again!

Anyone attempted anything like this before?
Go to the top of the page
+Quote Post
Alex B
post May 17 2007, 08:19
Post #2





Group: Members
Posts: 1303
Joined: 14-September 05
From: Helsinki, Finland
Member No.: 24472



QUOTE (d6mck @ May 17 2007, 00:51) *
Much I as would not normally touch transcoding with a bargepole, my beloved MP3 player (an Archos GMini XS202S) has a problem with playing mono MP3s (specifically, downloaded podcasts from New Scientist).

I've tried to re-encode using Foobar2000 and LAME, but any -m option appears to be ignored, and I end up with mono again!

Anyone attempted anything like this before?

LAME cannot create new audio channels. Foobar has a "Convert mono to strereo" DSP filter that should do the trick. I think it is included in the default DSP filters (if not, then a plugin is probably available in the foobar site). Just select select the "DSP Processing" conversion option and activate "Convert mono to strereo". You may want to disable other possibly active DSP options.


--------------------
http://listening-tests.freetzi.com
Go to the top of the page
+Quote Post
Wook
post May 17 2007, 10:12
Post #3





Group: Members
Posts: 21
Joined: 7-April 05
Member No.: 21264



QUOTE (d6mck @ May 16 2007, 21:51) *
Much I as would not normally touch transcoding with a bargepole, my beloved MP3 player (an Archos GMini XS202S) has a problem with playing mono MP3s (specifically, downloaded podcasts from New Scientist).

I've tried to re-encode using Foobar2000 and LAME, but any -m option appears to be ignored, and I end up with mono again!

Anyone attempted anything like this before?


I suggest you do this in 2 stages, converting to an uncompressed WAV first then to mp3. This is presumably what Foobar has been doing automatically but if you do it like this you can make sure that the WAV produced in the first step is in stereo. Foobar/LAME should then produce a stereo MP3 form this without problem.

This post has been edited by Wook: May 17 2007, 10:16
Go to the top of the page
+Quote Post
pdq
post May 17 2007, 14:11
Post #4





Group: Members
Posts: 3394
Joined: 1-September 05
From: SE Pennsylvania
Member No.: 24233



Would it theoretically be possible to do this conversion losslessly, taking the mono channel as the mid channel and all zeros for the side channel?
Go to the top of the page
+Quote Post
Omion
post May 18 2007, 05:50
Post #5





Group: Developer
Posts: 432
Joined: 22-February 04
From: San Diego, CA
Member No.: 12180



@pdq:
Yup. That'd work perfectly (*). The problem is finding a program that would do it. I suppose I can hack mp3packer to support that, but it's not exactly high on my priority list.

(*) as long as the bitrate of the mono file is not anywhere near 320kbps, but I doubt that's the case.


--------------------
"We demand rigidly defined areas of doubt and uncertainty!" - Vroomfondel, H2G2
Go to the top of the page
+Quote Post
M
post May 18 2007, 17:01
Post #6





Group: Members
Posts: 964
Joined: 29-December 01
Member No.: 830



QUOTE (Omion @ May 17 2007, 23:50) *
@pdq:
Yup. That'd work perfectly (*). The problem is finding a program that would do it. I suppose I can hack mp3packer to support that, but it's not exactly high on my priority list.

(*) as long as the bitrate of the mono file is not anywhere near 320kbps, but I doubt that's the case.

Unless I'm mistaken, the maximum available bitrate for a mono MP3 (without going into freeformat) is 160 kbps.

- M.
Go to the top of the page
+Quote Post
pdq
post May 18 2007, 17:18
Post #7





Group: Members
Posts: 3394
Joined: 1-September 05
From: SE Pennsylvania
Member No.: 24233



QUOTE (M @ May 18 2007, 12:01) *
QUOTE (Omion @ May 17 2007, 23:50) *

@pdq:
Yup. That'd work perfectly (*). The problem is finding a program that would do it. I suppose I can hack mp3packer to support that, but it's not exactly high on my priority list.

(*) as long as the bitrate of the mono file is not anywhere near 320kbps, but I doubt that's the case.

Unless I'm mistaken, the maximum available bitrate for a mono MP3 (without going into freeformat) is 160 kbps.

- M.


If that's true then couldn't one get higher quality by encoding a mono source as joint stereo with zero side channel? The mid channel should then get ~320 kbps.
Go to the top of the page
+Quote Post
Alex B
post May 18 2007, 17:36
Post #8





Group: Members
Posts: 1303
Joined: 14-September 05
From: Helsinki, Finland
Member No.: 24472



QUOTE (M @ May 18 2007, 19:01) *
Unless I'm mistaken, the maximum available bitrate for a mono MP3 (without going into freeformat) is 160 kbps.

Have you tried LAME -b 320 -m m ?

( I have. wink.gif )

This post has been edited by Alex B: May 18 2007, 17:36


--------------------
http://listening-tests.freetzi.com
Go to the top of the page
+Quote Post

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



RSS Lo-Fi Version Time is now: 2nd September 2014 - 06:58