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2
General Audio / Re: Tested: codecs vs battery life on Android telephones
Last post by Marsu42 -
Quote from: Nick.C on
https://www.rockbox.org/wiki/CodecPerformanceComparison

The rockbox comparison reminds of that Opus isn't one codec, but two - SILK and CELT, supporting threee modes - which probably shouldn't randomly tested together. https://wiki.xiph.org/OpusFAQ#Why_not_keep_the_SILK_and_CELT_codecs_separate?

Low bitrate Opus decoding seems to be significantly faster (i.e. should use less power for the same job), probably due to SILK or hybrid mode being used?

On the other hand, modern Opus with LACE/noLACE post-processing on high decoding complexity settting is probably a lot worse performance-wise - but makes up for that by significant enhancement in <16kbps quality.
4
Lossless / Other Codecs / Re: HALAC (High Availability Lossless Audio Compression)
Last post by Kraeved -
@mudlord, Hakan understood me perfectly, but you didn’t, alas. Okay, I can elaborate.

HALAC is designed for people. It is constantly compared with other tools that people use in order to highlight its superiority. It was never limited to the author’s fun, internal use, or, say, participation in the Informatics Olympiad.

When you make a project for people, then people inevitably provide feedback. It ranges from admiration to frustration, and in between there are questions and suggestions. Thanks to this feedback, projects develop further. If this is not obvious to you, then look at issue trackers and forums of the well-known apps. For example, Peter added OGG chapters support to Foobar2000 because I asked about it and then he recompiled it because other users complained about a crash while calculating ReplayGain values on systems without AVX. If you are not ready to process feedback or even do not need it, then make it clear in the first place. For example, disable the issue tracker on Github. It's that simple.

Hakan and I talked about priorities: a) SSE2/3 version enables more users to benefit from the tool and b) users need not only to encode, but also to listen to the material, otherwise the benefits of the tool are more visible on the charts than in real life. The author agreed that there was a reasonable grain in this appeal.
6
General Audio / Can ALAC/m4a detect file corruption?
Last post by shitdarling -
I have found amount of article, and know that flac/ape/tak can check audio integrity with inner crc info and outter md5.
ALAC/m4a is also open. But its format is so complicated (so many "box" type with different meta info), and I try to find crc or md5
in the format  structure detail description, and cant find them.

I have tried use an hex editor directly change some random bytes in middle of the alac file.
First time I change 2 position, [foobar 2000 - verify integrity] says it's ok. So the check tool cant detect this change.
Second time I change 2 more position, and this time the tool report :
"Reported length is inaccurate : 4:25.653333 vs 4:25.560454 decoded
Error: Decoding error: Unsupported format or corrupted file, frame: 2112 of 2861".

May there anyone know much about ALAC/m4a structure could tell me :
Can ALAC/m4a detect file corruption? (with inner metadata like crc/md5?or other mechanism?) O:)
9
Lossless / Other Codecs / Re: HALAC (High Availability Lossless Audio Compression)
Last post by mudlord -
Quote from: Kraeved on
Or the results were removed because HALAC is still the intellectual fun of its creator, and not a solution for the masses.

Again I will post: Does it even matter if that is the case? There is plenty of cases I have programmed something that is 100% not intended for general public use under a FOSS license, because I truly believe nothing of value will be gained from it being open source, which from time and time again, is exactly the case for me. Zero value is gained from code being FOSS, at all, zero people even used said code, but only the binary form. And even then its sketchy at best.

Hakan has 100% right to do whatever they want, including using AVX and co: its their project, not yours.