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Converting MP3 to Smaller MP3 or AAC?
Chris-AFC
post Jul 3 2013, 12:14
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Hi guys

Basically I have recently been converting all my FLAC files to 128kb AAC files to put on a cloud server so I can use on my phones and what-not when away from home. The reason for the low bitrate is the limited cloud storage space. I use the highest possible VBR MP3 files on my Cowon J3 so the cloud music is really only for backup and so I can put absolutely EVERYTHING on there.

Even though the vast majority of my collection is in FLAC, I do have some MP3 files too. Most of them are 320 CBR and I will need to downsize them to get them all on the cloud. What I'm wondering is, will I be better off converting them to something like 128 VBR MP3 or to 128kb AAC? Normally I'd always choose AAC at that bitrate but I'm worried if converting to a different format from MP3 will result in worse quality than just converting to 128 VBR MP3.

Thanks in advanced for any help.
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pdq
post Jul 3 2013, 13:18
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It has been reported that converting mp3 to mp3 gives worse results than mp3 to other lossy formats, but this is just anecdotal. You really should test for yourself.
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Dynamic
post Jul 3 2013, 14:55
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Our very own Wiki / Knowledgebase includes an article with many links to past experiences, all with TOS#8 style evidence

http://wiki.hydrogenaudio.org/index.php?title=Transcoding


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Chris-AFC
post Jul 3 2013, 19:33
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AAC it is then!

Cheers smile.gif
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EagleScout1998
post Jul 3 2013, 20:39
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QUOTE
It has been reported that converting mp3 to mp3 gives worse results than mp3 to other lossy formats


I thought the conversion process involved decoding the source file to an intermediate uncompressed format.
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eahm
post Jul 3 2013, 21:13
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This guy did few test with lossy codecs re-compressing up to 100 times. I think once for personal purposes is fine.

http://www.hydrogenaudio.org/forums/index....st&p=828298

This post has been edited by eahm: Jul 3 2013, 21:15


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greynol
post Jul 3 2013, 22:09
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QUOTE (EagleScout1998 @ Jul 3 2013, 12:39) *
QUOTE
It has been reported that converting mp3 to mp3 gives worse results than mp3 to other lossy formats

I thought the conversion process involved decoding the source file to an intermediate uncompressed format.

That's correct, though it doesn't change the possibility that transcoding mp3 to a different lossy format will give better results, especially with smearing.


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