Yalac - Comparisons, How the evaluation release compares to other compressors Options

[TBeck]

Content

In this thread the testers should post comparisons of the preset modes of Yalac (Working name for "Yet another lossless audio compressor") with other lossless compressors.

The results for specific variations of individual encoder options should go into the thread " Yalac – Evaluation and optimization".

Guidelines

Please post the exact version number of the compressors. Compression ratio should be specified in percent of the uncompressed file size. Speed figures should be specified as multiple of real time (duration of the test files). A specification of your test system, especially the CPU, would be helpful.

Open end: Feel free to add more results later.

What happened

Bad timing of my introduction (April 1.) forced an early publication of an evaluation release of Yalac, to prove, that it really works. This are results of 8 forum members, who where so kind to test the experimental release for me.

Many thanks!

Goals

Yalac should finally achieve compression ratios on par with Monkey's Audio High. Decoding speed should be at least two times higher than Monkey and never be significantly lower than with FLAC (possibly Yalac will later be integrated into FLAC).

My next steps

The first results i have received from the testers show me some weaknesses of the encoder. That's a good thing, because that means, that there definitely is a chance to increase the compression efficiency! Same is true for the speed; especially the decoder is not fully optimized yet. But it will take some time, before i will come up with an optimized release.

Links to 24 bit files i have used

I think, they are hard to find.

CODE

44 KHz, 24 bit

mytek_8X96_24bit_web.wav
Mytek-stereo96adc_evans.wav
Mytek-stereo96adc_ravel.wav

Source: http://www.mytekdigital.com/compare/comparison1.htm

48 KHz, 24 bit

McDougalsMen24bit_48kHz.wav
sister24bit_48kHz.wav

Source: http://ff123.net/samples.html

Or make a better Google search. foosion shows you how: http://www.hydrogenaudio.org/forums/index....ndpost&p=381702

This post has been edited by TBeck: Apr 12 2006, 20:23

[TBeck]

V0.05 is done

Changes:

- Preset FASTEST is gone. The new FAST preset achieves the same speed on my system and does this with only a small decrease in compression efficiency (maximum 25 percent of the difference between old FAST and FASTEST).
- Preset HIGH is 40 percent faster on my system.
- Preset HIGH activates the option "Bitcoder / Optimize choice".
- Preset INSANE uses frame partition resolution 256 and the new encoder option "BitCoder / Optimize Partition".
- Modification of the window function used by "Apply Window". Might help with some problem files...
- Selection of a preset doesn't affect the debug options in the encoder options dialog anymore.
- Select the new debug option "No output" to encode without generating files.
- Redesign of the dialogue options for frame partitioning.
- Error in BitCoder fixed, which sometimes generated errors in the file stream.
- Working data of the decoder was not properly aligned. The fix can improve decoding performance on some systems.
- Clean up of source code. Could give new errors...
- File format changed!

Not done:

- Speed optimization of Frame Partition Calculator resolution 256, which is much slower than 128. Unfortunately my new algorithm didn't work well.

Release:

I hope to send the new version to the following testers within the next hours:

Destroid
guruboolez
Josef Pohm
Shade[ST]
Synthetic Soul

Only reason for this selection: I haven't heard from the other testers within the last 10 days and i don't want to fill their mail box with new versions they possibly currently don't need.

Any of them can sent me an email anytime, and i will sent the current version.

What could be tested:

The performance of the new implementations of the presets FAST, HIGH and INSANE might have changed.

Apply window should hurt less on the rare problem files.

Plans for V 0.06:

- Implementation of a simple command line version.
- Possibly some further assembler optimization to speed up especially preset HIGH. All optimizations in V0.05 were algorithmic.
- More clean ups of my source code. Not really interesting for the tests.


Thomas

This post has been edited by TBeck: Apr 29 2006, 11:20