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Topic: Sound Data Size Between Lossless and Wave Differ (Read 2654 times) previous topic - next topic
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Sound Data Size Between Lossless and Wave Differ

Hi,

I was wondering if someone might be able to shed some light on this...

When ripping a wav in EAC using Secure mode, I get a wave file with no errors, which when opening in Sound Forge, shows a sound data size of 70,865,760 bytes.

The same track ripped with EAC using Secure mode and then passed to the external WMA9 compressor in Lossless - shows a sound data size of 70,865,700 bytes.

This is a lossless version of the Wave file - anyone know what the difference is in the 60 bytes?

Many thanks for your help in advance.

Sound Data Size Between Lossless and Wave Differ

Reply #1 –
anyone?

Sound Data Size Between Lossless and Wave Differ

Reply #2 –
How many samples are in the two files?  If its the same number, the size
difference is probably just due to different file headers.

If you really want to be sure, use something like foobar's sample compare feature to check that the two files are mathamatically equal.

Sound Data Size Between Lossless and Wave Differ

Reply #3 –
Quote
Hi,

I was wondering if someone might be able to shed some light on this...

When ripping a wav in EAC using Secure mode, I get a wave file with no errors, which when opening in Sound Forge, shows a sound data size of 70,865,760 bytes.

The same track ripped with EAC using Secure mode and then passed to the external WMA9 compressor in Lossless - shows a sound data size of 70,865,700 bytes.

This is a lossless version of the Wave file - anyone know what the difference is in the 60 bytes?

Many thanks for your help in advance.

[a href="index.php?act=findpost&pid=358824"][{POST_SNAPBACK}][/a]

Just a guess, but possibly the WAV header is tossed.  FLAC doesn't keep certain thigns.  For example wav files made with sound forge have some extra data that FLAC tosses when encoding.  You get a message like "skipping unknown sub-chunk".  Not the same as a wav header, but IIRC many lossless encoder don't keep wav headers, but simply reconstruct them on decoding or some crap.  I have no idea what I'm talking about though, but I think the concept is right.
 

Sound Data Size Between Lossless and Wave Differ

Reply #4 –
Quote
How many samples are in the two files?  If its the same number, the size
difference is probably just due to different file headers.

If you really want to be sure, use something like foobar's sample compare feature to check that the two files are mathamatically equal.
[a href="index.php?act=findpost&pid=358833"][{POST_SNAPBACK}][/a]


There are 17,716,425 samples in the wma lossless file

There are 17,716,440 samples in the wav file of the same track.

I ran foobar's bitcompare and it says this:

INFO (foo_bitcompare) : No differences in decoded data found.
ERROR (foo_bitcompare) : Files have different length.

Thanks Mike for your reply.