what is mpeg2 layer 3? |
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what is mpeg2 layer 3? |
 Aug 16 2005, 10:29
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#1
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Group: Members Posts: 7 Joined: 3-August 05 Member No.: 23665  |
Hi everyone,
I've got some files that have mp3 extension. My player shows that they have bitrate 80kbs and frequency 225000. EncSpot shows me that they are of type mpeg2 layer III. I wonder what is this mpeg2 layer III? I thought mp3 is of type mpeg1 layer III. I find that my files are very small in size and still the quality is acceptable. Anyone that has experience with such encoding? Does it worth to try it? How to encode and how to achieve good results? |
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Aug 16 2005, 10:48
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#2
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 Group: Members (Donating) Posts: 552 Joined: 9-June 04 From: A place long since forgotten... Member No.: 14572 |
Has to do with the samplerate and possible bitrates.
CODE Sample Rates Bitrates
MPEG-1 32, 44.1, 48 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320 MPEG-2 16. 22.05, 24 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 This post has been edited by DreamTactix291: Aug 16 2005, 10:48 -------------------- Nero AAC 1.5.1.0: -q0.45
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Aug 16 2005, 10:57
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#3
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 Group: Members Posts: 3621 Joined: 14-May 03 From: Bad Herrenalb Member No.: 6613 |
If the sampling rate is lower than 16 KHz, the files are MPEG 2.5.
 AFAIK, MPEG 2.5 is not an official standard but was introduced to support low sampling rates. This post has been edited by Sebastian Mares: Aug 16 2005, 10:58 -------------------- http://listening-tests.hydrogenaudio.org/sebastian/
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Aug 16 2005, 12:18
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#4
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 Group: Developer Posts: 1317 Joined: 20-March 04 From: Göttingen (DE) Member No.: 12875 |
The mpeg2 specification not only contains a low sampling rate extension but also a multichannel extension.
Sebi |
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Aug 16 2005, 15:41
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#5
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 Group: Members Posts: 92 Joined: 19-May 05 Member No.: 22137 |
I noticed that the mp3 sound files that are part of the game "Sid Meier's Alpha Centauri" are MPEG2.
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Aug 16 2005, 17:47
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#6
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Group: Members (Donating) Posts: 552 Joined: 9-June 04 From: A place long since forgotten... Member No.: 14572 |
QUOTE (SebastianG @ Aug 16 2005, 06:18 AM) The mpeg2 specification not only contains a low sampling rate extension but also a multichannel extension. A multichannel extension that has never had an encoder implementation AFAIK Sebi 
-------------------- Nero AAC 1.5.1.0: -q0.45
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Aug 16 2005, 18:06
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#7
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 Rarewares admin Group: Members Posts: 7515 Joined: 30-September 01 From: Brazil Member No.: 81 |
QUOTE (DreamTactix291 @ Aug 16 2005, 01:47 PM) A multichannel extension that has never had an encoder implementation AFAIK There is an MP2 encoder. Check RRW. -------------------- Get up-to-date binaries of Lame, AAC, Vorbis and much more at RareWares:
http://www.rarewares.org |
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Aug 16 2005, 18:35
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#8
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Group: Members (Donating) Posts: 552 Joined: 9-June 04 From: A place long since forgotten... Member No.: 14572 |
Alright no MP3 implementation. The MP2 encoder sounds interesting though
-------------------- Nero AAC 1.5.1.0: -q0.45
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Aug 18 2005, 09:44
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#9
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Group: Members Posts: 112 Joined: 18-August 05 Member No.: 23986 |
couldn't this be mp3pro, too? I mean if you play a mp3pro file in a non-mp3pro-compatible standard mp3 player a 44kHz file ends up in a 22kHz standard mp3 file. The Spectral Band Replication (or whatever its called
 ) will not be seen by a standard mp3 decoder and so there are no higher frequencies available even though they are in the mp3pro file.
-------------------- flac 1.2.1 -8 (archive) | aoTuVb5.7 -q 4 (pc, s1mp3)
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Aug 19 2005, 13:16
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#10
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Group: Members Posts: 881 Joined: 11-October 02 Member No.: 3523 |
mp3pro is not part of the official mp3 standard
-------------------- I know, that I know nothing (Socrates)
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Aug 19 2005, 13:42
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#11
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Group: Developer Posts: 1317 Joined: 20-March 04 From: Göttingen (DE) Member No.: 12875 |
though, it makes use of mpeg2 (half the sampling rate) layer 3 for the "compatibility layer"
Sebi |
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Lo-Fi Version | Time is now: 25th May 2013 - 16:15 |
