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18th August 2018, 16:40 | #21 | Link | |
Herr
Join Date: Apr 2009
Location: North Europe
Posts: 556
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Quote:
https://forum.doom9.org/showthread.p...84#post1846184 Even a Opus@128kbps got longer a much decoding-time than AAC@144kbps, Opus@128kbps: "Decoding time: 0:00.832". Last edited by Forteen88; 19th August 2018 at 06:48. |
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19th August 2018, 00:59 | #23 | Link |
Registered User
Join Date: May 2002
Posts: 95
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Try that on android and the times are going to vary greatly, in windows foobar2000 in the test make opus appear 5-6 times slower while in reality is only around 0.6 times slower in the worst case, also opus is faster than HE-AAC by a good margin.
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19th August 2018, 06:02 | #24 | Link | |
Herr
Join Date: Apr 2009
Location: North Europe
Posts: 556
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Quote:
Although, as 'Phanton_13' wrote, maybe foobar2000 got a much slower Opus-decoder than AAC-decoder. I did another test, source-audio was from a DD5.1 movie, AppleAAC@320kbps (foobar2k v1.4, 8 threads in Decoding speed test): Decoding time: 0:37.325 874.862x realtime Opus@300kbps (foobar2k v1.4, 8 threads in Decoding speed test): Decoding time: 2:38.280 209.636x realtime Last edited by Forteen88; 19th August 2018 at 06:46. |
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19th August 2018, 23:57 | #26 | Link |
Broadcast Encoder
Join Date: Nov 2013
Location: Royal Borough of Kensington & Chelsea, UK
Posts: 2,905
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I'm more concerned about compatibility rather than the playback speed.
Besides, Opus was created to accomplish good communications with low bandwidth when two or more people were talking. Later on, they developed other profiles that aimed to compress other types of contents and not just speech and they did a good job, however, Opus is not widely used and is not considered as standard as AAC and AC3 are. The large majority of players will likely accept AAC or AC3 audio files, but will probably refuse an Opus audio file. I'm not talking about computers, I'm talking about hardware decoders like bluray players, consoles and smart tv. I also gotta say that AC3 might be a bit old (although still valid and widely used), but AAC has a really good psychoacoustic model and its MDCT filter bank that adaptively switches between 128 and 1024 bands (length 256 and 2048 FFT windows, using 50% overlap) demonstrated to be effective through these years, that's why AAC has become the first choice when people encode lossy audio contents. I'm not saying that you shouldn't use Opus, but is it really worth saving few megabytes at the expense of compatibility with many devices when generally AAC 192kbit/s would be sufficient, AAC 320kbit/s would be good and AAC 384 kbit/s would be crystal and all you need? Last edited by FranceBB; 20th August 2018 at 00:02. |
20th August 2018, 16:50 | #27 | Link |
Registered User
Join Date: Feb 2002
Location: San Jose, California
Posts: 4,407
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Then why did you only mention speed and not compatibility? Some users do not care about bluray players, consoles, or smart TVs at all. Let them encode to new higher quality options if they want to to.
We would be stuck on MPEG2 with MP3 if compatibility always won out. Also, HEVC is still a bad idea if compatibility is what you are going for. There are a lot of devices out that that support AVC+AAC that do not support HEVC and AVC at a bit higher bitrate would be sufficient. Opus is catching on, I would not be surprised to see some smart TVs supporting soon. They are usually running Android and have decent enough CPUs they could do it even without hardware decoding.
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20th August 2018, 18:44 | #28 | Link |
Broadcast Encoder
Join Date: Nov 2013
Location: Royal Borough of Kensington & Chelsea, UK
Posts: 2,905
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'cause *I am* more concerned about compatibility, but I'm not the one who asked the question, @Arhu is, I just jumped in the topic and replied with my point of view xD
Which is the reason why I encode files in MPEG-2 interlaced 25i TFF by doing speed-ups or blending at work on a daily basis. T_T (Omneon playout ports compatibility for 1080i contents :'( ) Last edited by FranceBB; 20th August 2018 at 18:48. |
21st August 2018, 21:58 | #29 | Link |
Moderator
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,771
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Personally, I think xHE-AAC is going to be used a lot more than Opus ever will, particularly for commercial use. It outperforms Opus, offers seamless bitrate switching, and is broadly available in AAC licensing. Opus is an excellent codec, seamlessly bridging between low bitrate speech coding with efficient perceptually lossless encoding.
The OEMs have many years of familiarity with Fraunhofer and Via licensing, and I expect device classes that support AAC today to support xHE-AAC in the future. |
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settings, tunes, x265 |
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