hybrid coding mode Options

[Pixar]

Hello all =)
I tested a hybrid coding mode (the best-miqhhb5) ...
I was delighted with the highest quality.
Programs designed for the detection of differences in sound do not detect a difference lossy and lossless.

What removes from the sound?
I did not find any similarity with other lossy codecs))
How have you achieved such excellent results?

This post has been edited by Pixar: Dec 16 2010, 11:57

[pdq]

The lossy version is slightly less accurate than the oiginal, so in effect it is a little bit noisier.

I do hope you will change your avatar.

[bryant]

The hybrid coding mode just adds broad spectrum quantization noise during encoding, and this is very similar to the the natural noise floor of most recordings. For the command line you mention, this added noise would be very low level, and might even be below the noise floor of the recording. This would be almost impossible to detect with any program (mush less hear), and especially for programs that are looking specifically for the kind of things that regular lossy codecs do (like breaking up the audio into separate frequency bins, which WavPack hybrid never does).

If you tried a lower bitrate with the hybrid mode (like -b3, which gives about 270 kbps) then you might be able to hear noise in some music (especially very tonal or electronic music) because at lower bitrates WavPack hybrid will generally not do as well as regular lossy codecs. However, because the only artifact is this smooth added noise, those detection programs might still fail even though the degradation is audible.

[Pixar]

Degradation does not occur))
With your codec I do not need lossless (only to spend too much space) ...
Optimum price / quality ratio.

I have a question.
How do I glue together multiple files into one (without transcoding)?
Analogue to Ogg Vorbis
copy / b 1.ogg + 2.ogg + 3.ogg = image.ogg
In WavPack is not working.

Thank you for your work bryant.
WavPack brilliant creation of genius

[bryant]

How do I glue together multiple files into one (without transcoding)?
Analogue to Ogg Vorbis
copy / b 1.ogg + 2.ogg + 3.ogg = image.ogg
In WavPack is not working.

You can concatenate WavPack files like you describe, but the only way to decode the result is to use the -b flag with wvunpack (“blind” decoding). I have done this to combine tracks, but you really need to transcode to make the result playable, seekable, etc. Of course, lossless transcoding is not a problem (and it works great with pipes), but I would not do it with hybrid.

One of the things I would like to create is a WavPack file “fixer” that will modify the headers of files like these in place (without transcoding) because there are other situations where these files can occur, but I haven’t gotten around to it.

[pdq]

I do hope you will change your avatar.

Thank you, that's much better.

[Pixar]

I do hope you will change your avatar.

Thank you, that's much better.

You have amused me

One of the things I would like to create is a WavPack file “fixer” that will modify the headers of files like these in place (without transcoding) because there are other situations where these files can occur, but I haven’t gotten around to it.

It would be excellent. Thank

[DARcode]

[...]
One of the things I would like to create is a WavPack file “fixer” that will modify the headers of files like these in place (without transcoding) because there are other situations where these files can occur, but I haven’t gotten around to it.

That'd be awesome, count me among the very very interested in that, clearly after you're done merging all the executables into a single one ...

[Cavaille]

Thank you for your work bryant.
WavPack brilliant creation of genius

This is being said quite too seldom around here in my opinion. Indeed, WavPack is the best lossy compressor available. It produces precisely predictable results when used with several bitrates and it always works. Stable as a rock. One can rely upon it. I use it very often with 96 kHz files together with the -q switch. It´s just perfect for that: you´ll get wonderful "master" files to create other things from and you save space at the same time. Brilliant!

[shadowking]

I find 4 bps very reliable , saves a lot of space over lossless (2 ~ 3 times), average is 370 kbps for cd audio. I use -b4hhx and could never abx anything in my collection of 400+ cd's. I often transcode these lossy files to mp3 with great results too.

[bryant]

Thanks guys; I’m glad WavPack is working out for you.

I also find the hybrid lossy mode useful for certain things. Lately I have been doing some recording from local HD radio broadcasts. I first record the analog HD radio signal onto a Rockboxed iRiver H120 using WavPack lossless, then I copy those to the PC for conversion. If I don’t care too much about quality I’ll just transcode them to MP3, but if I am concerned about possible lossy to lossy artifacts (because the HD radio uses a lossy codec) then I transcode them to WavPack lossy at about 300 – 400 kbps.

I have thought about putting 4 bps hybrid lossy mode encoding directly into the Rockbox code, but I’m afraid it would just confuse people and I would be the only one using it...

[Didjeridoo]

Hello to all!
I am interested in the further development of the hybrid mode.
Is it possible to integrate the psy acoustic model from musepack to wavpack.
Or possible to encode sound to make with no noise?
Thanks & sorry for broken English))

[darkbyte]

Is it possible to integrate the psy acoustic model from musepack to wavpack.

I'm hoping in a stronger integration with the LossyWAV project. It would be awesome to encode the lossy part with the ultraportable setting plus have a correction file for lossless use with the already well supported hybrid file format of WavPack.

[Didjeridoo]

I'm hoping in a stronger integration with the LossyWAV project. It would be awesome to encode the lossy part with the ultraportable setting plus have a correction file for lossless use with the already well supported hybrid file format of WavPack.

It would be nice.
Unless of course lossywav better musepack.