Converting Format 'X' to Format 'Y' and Other Information on File Sizes

Problem:
After converting from format X to format Y the file size of the converted file is either similar or much bigger.

Why:
The file size of the converted file depends on a number of factors, such as:

File formats like WMA, MP3, OGG, FLAC and AAC are all compressed - converting between any of these formats may not give huge gains in terms of file size reduction.

Wave files come in both compressed and uncompressed flavours, depending on what codec they are encoded with. Wave codecs like PCM, A-Law and Mu-Law give uncompressed files, while codecs like GSM and ADPCM are give compressed files. Converting from uncompressed Wave to compressed Wave or another compressed format will normally give larger file size reductions than going from a compressed format to another compressed format.

To get an idea of what the file size of the converted file will be, do the following:

  1. Determine whether your original and converted files are of a compressed or uncompressed format. If you have read the previous blurb above and still don't know, see the following page for a more comprehensive file formats overview: http://www.nch.com.au/acm/formats.html
  2. Examine the audio properties of the original file. To do this, follow these steps:
  3. Compare the audio properties obtained from the file in part (2) with the settings you are using to create the converted file. Compare the numbers for properties like "Channels", "Sample Rate" and "Bit Rate" (if applicable), and see which of the two files has bigger numbers - that file will ultimately have the bigger file size. If one of the files is uncompressed though, more often than not that file will be bigger than the other. If you do not know how to check what settings you are applying to the converted file, please refer to the program's help documentation for assistance.

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