Question about Converting MP3 Sample Rates

Discussion in 'Random Topic Center' started by bullados, Mar 24, 2008.

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  1. bullados

    bullados <a href="http://pokegym.net/forums/showthread.php?

    Hey, guys! I recently started generating an MP3 library, but I made a MAJOR mistake in my initial downloads. I sampled all of the CDs at 192 kb/s, and now my MP3 player is full at about 5000 songs. Is there a way to change the sample rate of these songs to about 128 kb/s or 112 kb/s? If so, where can I find it?

    Thx for the help!
     
  2. Mew*

    Mew* Active Member

    Umm, well I'm looking for you.
    Here is what I've found:
    http://www.mymusictools.com/utilities_28/mp3resizer_25585.htm
    http://www.mymusictools.com/audio_converters_4/4musics_mp3_bitrate_changer_17930.htm
    http://www.download.com/MP3Fitness/3000-2140_4-10433129.html?tag=lst-1
    http://www.download.com/MP3Resizer-Express/3000-2170_4-10755789.html?tag=lst-2

    Now those are all just temporary free trials, but since this isn't something you'll be doing regularly, those trials should be enough. If you just want to find some more programs on your own, just use search terms like this: bitrate reduce mp3
    Good luck!
     
    Last edited: Mar 24, 2008
  3. Chairman Kaga

    Chairman Kaga Active Member

    I wouldn't go below 128Kbps. Once you dip below that you really start hearing the artifacts from the psychoacoustic masking.

    What will probably pay off more for you in the long run, is to first get a high-quality encoder. LAME is the best out there by far, and it's free (GPL).

    Then, start using variable bit rate (VBR) instead of constant bit rate (CBR). With CBR, the encoder uses a fixed bit rate for each frame, so you're losing more quality than necessary on more complex frames, and keeping more than necessary on less complex ones.

    With VBR, the encoder performs analysis on the audio and determines the best bitrate on a frame-by-frame basis. That ability to step down the bitrate on frames where the higher rate is unnecessary can cut out a MB or two, while actually giving you better quality over the same file CBR-encoded.

    Of course, to do this right, you'll need to rip from the CDs again. You don't want to recompress the compressed MP3s, because you end up losing more quality than if you started with the CD source and encoded to a lower bit rate. That may be too much work for you. I've been there before (with over 2000 tracks), but the work paid off. There's virtually no noticeable quality loss on the high end, even when playing through a high-quality sound system.
     
  4. bullados

    bullados <a href="http://pokegym.net/forums/showthread.php?

    Dang. It took me over 3 months of taking stuff out of my library to get those tracks.

    My MP3 player seems to like the 112 rate fine enough. I'm not exactly looking for quality here. As long as the music is recognizable and doesn't skip, I'm happy.

    Thx for the links!
     

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