In Sony Vegas Pro 10 I've placed an .mp3 file (about 3MB file size), then I've cut it slightly at the end to shorten the length. I've tried to encode it with following settings:

File - Render As  
Save As Type: MP3 Audio  
Template: Default Template  
Description: Audio: 256 Kbps, 44,100 Hz, 16 Bit, Stereo, MP3

The encoded file is about 6MB and it seems that the resulting file is the same quality as original.

How can I render .mp3 without getting a larger file size than the original?

  • OK, the output is 256kbps / 44.1K. But what are the sample rate and bit rate for the original file?
    – Jim Mack
    Commented May 13, 2015 at 17:09
  • @JimMack, how can I check this data, pls?
    – qadenza
    Commented May 13, 2015 at 17:12
  • Use Mediainfo. I don't really know Vegas, but it should have some sort of metadata display as well ...
    – MoritzLost
    Commented May 13, 2015 at 18:43
  • My guess would be that the original file was not recorded at 256kbps, but something lower like 192 or maybe even 128. Commented May 15, 2015 at 4:21

1 Answer 1


The settings say Stereo. The doubling of file size might indicate that the original file was mono.

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