... and we are already working on this, together with a very well respected company doing MPEG4 players.
Dont expect it in the near future though, current decoder chips like the SIGMA EM 8550 are not powerful enough to decode MPEG4 video and Vorbis audio at the same time, and this is the most used profile in matroska files, followed by MPEG4 video and AAC audio ( together with SRT or SSA subs ) and RealVideo9 and Vorbis audio.
Soon we will launch the latest features for matroska files, that will be the ability to store DVD subtitles ( vobsub's ) in MKV without the need to OCR them, and then MPEG2 video is the next on the list, so you can mix your SVCD video with Vorbis audio tracks:P...
You are invited to visit us on irc.corecodec.com #matroska for more information
Christian
matroska project admin
http://www.matroska.org
matroska backbone, EBML, is a binary form of XML;)
http://sf.net/projects/ebml , but we didnt update the CVS for a long time, the latest version of EBML and the specs are to be found on http://www.matroska.org...
The current OGM filters have a built in audio stream switcher, but as a result of that you can only use audio streams of the same sampling rate and channel number in it... no way to mux a 5.1 AC3 and a 2.0 Vorbis in the same file and play it fine.... matroska can do that, but you need mplayer, MPC, BSplayer, TCMP or VLC to be able to switch the streams during playback...
matroska can do that fine, just compile mplayer with matroska suport and tag the display AR of your files in mkvmerge when muxing them.... works like a charm...
For encoding/decoding, speaking of an openosurce 'mother implementation' :
http://sourceforge.net/projects/faac
Needless to say you will only find source code there, they wont distribute any binaries as Dolby would come asking about license fees then:-) !
For playback on Windows :
From MP4 files, in DirectShow based players : http://3ivx.com ( the D4D pack ) ; fully licensed
For winamp you need the in_aac plugins, make a search on http://hydrogenaudio.org on where to get it
For encoding, next Nero ( 5.5.10.35 ) can encode to AAC, either in.MP4 or.AAC format ; 50 encodes are free, or as much as you can do within 30 days trial period. Dont know the price of the unlimited plugin, nothing announced from Ahead/Nero here yet.
The old Psytel aacenc.exe 2.15 can be obtained from various places such as the famous 'rarewares' site ( no i dont give a link, use Google;-) ), it gave pretty good results, at least in VBR modes like 'normal', resulting in about 128 kbps. Needless to say this is not official, as PsyTel could never pay the necessary licenses to DolBy/MPEG-LA;)...
Last, but not least there is a very interesting tool called AACmachine on http://www.doom9.org, the number one site for DVD backups, using the mentioned aacenc 2.15;-).....
I am personally using AAC 5.1 with my DivX movies now, encoded with the new Nero test encoder, using the matroska opensource container format, and the CoreVorbis AAC decoder plugin... bitrates are 180 - 240 kbps for a complete 5.1 digital surround encoding, made from the AC3.... more on http://www.matroska.org....
AAC 5.1 surround sound work great in matroska
on
AAC Put To The Test
·
· Score: 2, Interesting
You question the use of AAC audio ? why bother, if we have MP3 for music ? Well, as a quality freak i will only use musepack ( MPC ) for audio compression, if ever, but for DVD backups with the DivX or XviD codec, i am using AAC as standard now.
Why ? well, the new Nero encoder will allow you to create high quality, true 5.1 surround AAC audio with a bitrate of about 180 - 240 kbps, from 5.1 AIFF or WAV files.
Use the matroska container and DirectShow parser filter ( http://www.matroska.org ) to store your DivX video with AAC 5.1 and the CoreAAC DirectShow decoder filter to playback on Windows.
A sample file ( 10 MB ) in incredible video quality, plus some documentation how to play and make such files, can be found here : http://corecodec.com/modules.php?op=modload&name=P NphpBB2&file=viewtopic&t=328
we should make sure Apple gets hold of Bejamin's signature list ( about 1300 now ) , make sure all of you sign in : http://www.petitiononline.com/mod_perl/signed.cgi? vorb123
If we have 10.000 signatures is should be possible to raise interest in Vorbis .
Slashdot Mirror
... and we are already working on this, together with a very well respected company doing MPEG4 players. Dont expect it in the near future though, current decoder chips like the SIGMA EM 8550 are not powerful enough to decode MPEG4 video and Vorbis audio at the same time, and this is the most used profile in matroska files, followed by MPEG4 video and AAC audio ( together with SRT or SSA subs ) and RealVideo9 and Vorbis audio. Soon we will launch the latest features for matroska files, that will be the ability to store DVD subtitles ( vobsub's ) in MKV without the need to OCR them, and then MPEG2 video is the next on the list, so you can mix your SVCD video with Vorbis audio tracks :P ...
You are invited to visit us on irc.corecodec.com #matroska for more information
Christian
matroska project admin
http://www.matroska.org
matroska backbone, EBML, is a binary form of XML ;)
http://sf.net/projects/ebml , but we didnt update the CVS for a long time, the latest version of EBML and the specs are to be found on http://www.matroska.org ...
In Quicktime you cant store AAC Vorbis RealVideo 9 RealAudio SRT subs SSA subs vobsub subs while matroska does support all fo that fine ...
The current OGM filters have a built in audio stream switcher, but as a result of that you can only use audio streams of the same sampling rate and channel number in it ... no way to mux a 5.1 AC3 and a 2.0 Vorbis in the same file and play it fine .... matroska can do that, but you need mplayer, MPC, BSplayer, TCMP or VLC to be able to switch the streams during playback ...
matroska can do that fine, just compile mplayer with matroska suport and tag the display AR of your files in mkvmerge when muxing them .... works like a charm ...
For encoding/decoding, speaking of an openosurce 'mother implementation' : http://sourceforge.net/projects/faac Needless to say you will only find source code there, they wont distribute any binaries as Dolby would come asking about license fees then :-) !
For playback on Windows :
From MP4 files, in DirectShow based players : http://3ivx.com ( the D4D pack ) ; fully licensed
For winamp you need the in_aac plugins, make a search on http://hydrogenaudio.org on where to get it
For encoding, next Nero ( 5.5.10.35 ) can encode to AAC, either in .MP4 or .AAC format ; 50 encodes are free, or as much as you can do within 30 days trial period. Dont know the price of the unlimited plugin, nothing announced from Ahead/Nero here yet.
The old Psytel aacenc.exe 2.15 can be obtained from various places such as the famous 'rarewares' site ( no i dont give a link, use Google ;-) ), it gave pretty good results, at least in VBR modes like 'normal', resulting in about 128 kbps. Needless to say this is not official, as PsyTel could never pay the necessary licenses to DolBy/MPEG-LA ;) ...
Last, but not least there is a very interesting tool called AACmachine on http://www.doom9.org, the number one site for DVD backups, using the mentioned aacenc 2.15 ;-) .....
I am personally using AAC 5.1 with my DivX movies now, encoded with the new Nero test encoder, using the matroska opensource container format, and the CoreVorbis AAC decoder plugin ... bitrates are 180 - 240 kbps for a complete 5.1 digital surround encoding, made from the AC3 .... more on http://www.matroska.org ....
You question the use of AAC audio ? why bother, if we have MP3 for music ? Well, as a quality freak i will only use musepack ( MPC ) for audio compression, if ever, but for DVD backups with the DivX or XviD codec, i am using AAC as standard now. Why ? well, the new Nero encoder will allow you to create high quality, true 5.1 surround AAC audio with a bitrate of about 180 - 240 kbps, from 5.1 AIFF or WAV files. Use the matroska container and DirectShow parser filter ( http://www.matroska.org ) to store your DivX video with AAC 5.1 and the CoreAAC DirectShow decoder filter to playback on Windows. A sample file ( 10 MB ) in incredible video quality, plus some documentation how to play and make such files, can be found here : http://corecodec.com/modules.php?op=modload&name=P NphpBB2&file=viewtopic&t=328
Nice one,
? vorb123
we should make sure Apple gets hold of Bejamin's signature list ( about 1300 now ) , make sure all of you sign in : http://www.petitiononline.com/mod_perl/signed.cgi
If we have 10.000 signatures is should be possible to raise interest in Vorbis .