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25th February 2016, 19:56 | #41 | Link | |
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7th May 2016, 22:06 | #42 | Link |
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Hi, has opus mode lossless? If not, will it be implement any day? Thanks
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8th May 2016, 14:17 | #44 | Link |
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I know flac, but my question is for other reason... I want compare that encoder lossless is more efficient (in terms of compression factor) if opus would have mode lossless.
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8th May 2016, 17:00 | #45 | Link |
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19th May 2016, 10:25 | #46 | Link |
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Opus would not be suitable in any way as a lossless codec. It works as well as it does because it generates a lot of fake (but close enough) data, like HE-AACv2 but even deeper and extended all the way to perceptually lossless. Codecs designed from the ground up for lossless are much better at it, and neither of Opus's are.
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22nd May 2016, 13:42 | #47 | Link |
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libopus v1.1.x-git / opus-tools v0.1.9 [2016-05-22]
FWIW, here's another set of fresh Opus v1.1.x binaries:
opus-tools.2016-05-22.zip
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22nd May 2016, 13:54 | #48 | Link | |
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All the "lossless" audio codecs I know work in time domain. These codecs pretty much come down to: The encoder predicts the next sample value using some fancy prediction function and then transmits the delta (difference) to the actual sample value. The decoder performs the same prediction and then adds the transmitted delta value, in order to restore the original sample value. This is how FLAC, Monkey's Audio and friends work. Easy to see why this is lossless. "Lossy" codes, on the other hand, typical work in frequency domain. First step is to transform the input samples from time domain into frequency domain. Then Psy-modelling is used to decide which frequency bands get more bits (e.g. more fine-grained quantization) and which get less bits (e.g. more coarse quantization). This is how MP3, AAC and friends work. The transform to the frequency domain and the inverse transform), which are typically done in floating-point math, probably already causes rounding errors that make the whole process non-lossless. And the quantization certainly makes it lossy. You could leave out the quantization, yes. But then compression probably sucks, because entropy coding won't save any bits.
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22nd May 2016, 19:24 | #50 | Link | |
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Just a little question though: Previous version reported: Code:
opusenc opus-tools v0.1.9-git SSE2 [2016-02-20] (using libopus 1.1.2-git SSE2 [2016-02-20]) While the new version reports: Code:
opusenc opus-tools v0.1.9-git SSE2 [2015-05-22] (using libopus 1.1.x-git SSE2 [2015-05-22]) |
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22nd May 2016, 19:43 | #51 | Link | |
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(I have no idea whether the next release will be v1.1.3 or v1.2.0 or v2.0.0, but currently PACKAGE_VERSION says "1.1.x-git")
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18th July 2016, 16:37 | #53 | Link | |
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Some news
Version 1.1.3 released https://www.opus-codec.org/ Quote:
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5th August 2016, 22:44 | #54 | Link | |
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6th August 2016, 04:17 | #55 | Link |
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Opus 1.1.3 compiled with mediaautobuild suite (gcc 6.x), x64 only
http://filenurse.com/download/b70a58...788595f62.html link will expire in a week
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29th August 2016, 05:29 | #56 | Link |
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Another up-to-date build of OpusTools
[compiled with GCC 4.8.5] Code:
[C:\] => opusenc --version opusenc opus-tools 0.1.9-24-g746e2af (using libopus 1.1.3) Copyright (C) 2008-2013 Xiph.Org Foundation |
3rd September 2016, 12:31 | #57 | Link |
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I hope that the opus developers concentrate on low bitrate audio as xhe-aac is far superior at 12-64kbps. Some digital radio platforms like DRM have support for this.
Last edited by hajj_3; 6th September 2016 at 09:39. |
7th September 2016, 03:39 | #59 | Link | |
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But the situation is changing now. Several months ago Opus 1.2 (early alpha) was already at least on par or somewhat better than HE-AAC at 48 kbps. Also xHE-AAC is a great format its main scope is 12-32 kbps. Its performance is very close to normal HE-AAC at 48-64 kbps. You can easily confuse xHE-AAC and highestly optimized HE-AAC (such as Fraunhofer Winamp's encoder) at 64 kbps. It's very likely that upcoming Opus 1.2 will be at least on par with xHE-AAC at bitrates 48 kbps and higher. It also to expect a reasonable quality from it at 32-40 kbps. |
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8th September 2016, 01:53 | #60 | Link |
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IIRC opus did some stuff on the lbr branch
did you compare opus vs hev2 or vs hev1 coz seems hev2 is still a bit better on 32-48kbps
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