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Compression of High-Definition files

Rick Mili Jan 08, 2018 11:18PM EST

In reviewing the audio info (using dbPowerAmp Audio Info function) for some files that I have purchased from you, I have noticed that some files are uncompressed (e.g. Classical) and others are compressed as much as fifty per cent.

1. What criteria do you use to decide whether or not to compress files - the original file size?
2. Does ProstudioMasters do the compression or do you receive the files from the record companies already compressed?
3. Does AIFF format (which is lossless and uncompressed) carry the same amount of metadata as FLAC (which is also lossless, but can be compressed?

Thank you.

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Customer Support Jan 12, 2018 12:48AM EST ProStudioMasters Support
Hi Rick,

1. FLAC compression is algorithmic - the specific percentage of data compression for each FLAC file is not a decision per se, but is adaptive to the audio that the algorithm is storing in data-compressed form. We use Level 8 compression to ensure the lowest lossless compression ratios possible in this format for any given audio input.

2. ProStudioMasters does apply the FLAC algorithm to generate lossless, compressed FLAC files from the uncompressed audio we receive.

3. AIFF and FLAC use different metadata formats, but should contain identical metadata when read by compatible audio playback software or hardware devices.

Best regards,


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