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Topic: Compressing a DTS WAV (Read 3669 times) previous topic - next topic
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Compressing a DTS WAV

I downloaded a couple DTS CDs from a newsgroup, and just for kicks I encoded in FLAC. It only shaved off about 10% (probably because DTS audio is already compressed), but the interesting thing is that the MD5s of the original and resulting WAVs are different. Why is that? Is FLAC changing something in the audio?

Compressing a DTS WAV

Reply #1 –
10% ? very nice!
fyi : dts-wav have built-in 12.5% redundancy, since each couple of bytes only holds 14 valid bits.

Compressing a DTS WAV

Reply #2 –
A difference in the headers perhaps?

Compressing a DTS WAV

Reply #3 –
Hmm... how can FLAC compress a DTS file? Are you talking about a DTS stream that was decoded to a 6 channel PCM stream?

It is very strange... this is akin to having FLAC compress an MP3. DTS is a compressed data stream. It should have no resemblance to a normal PCM WAV file whatsoever.

Compressing a DTS WAV

Reply #4 –
Quote
Hmm... how can FLAC compress a DTS file? Are you talking about a DTS stream that was decoded to a 6 channel PCM stream?

It is very strange... this is akin to having FLAC compress an MP3. DTS is a compressed data stream. It should have no resemblance to a normal PCM WAV file whatsoever.

You're right, DTS is a compressed format. However, it is still contained in a wav file pretending to be PCM data which is why it can be stored on a regular audio CD.

The values are limited to 14 bits (+/-8192) so that the blast of white noise that you get when you mistakenly play the data as PCM doesn't startle you to death or blow out your tweeters.

Lossless compressors are able to squeeze some out of this because of the 2 bits of every word that aren't used. Lossy compression would obviously be a disaster.