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Audio Upmixing

by Yew / May 12, 2004 10:41 AM PDT

I have a friend who's going to be strangled by me pretty soon if I can't find an answer to this.

He wants a fairly definitive answer as to whether Mplayer and/or Xine either can be made to out of the box or via some sort of 3rd party program, upmix audio. So say I have a video file with a stereo MP3 track in it. Is there some way to upmix that to say 5.1 or 6.1 audio assuming the hardware is all in place to handle it? It's understood that the upmixed audio won't be as good as true 5.1/6.1 audio, but simple mirroring of channels isn't really good enough for him.

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Re:Audio Upmixing. It's simple.
by R. Proffitt Forum moderator / May 12, 2004 11:21 AM PDT
In reply to: Audio Upmixing

Find out where this new audio content is going to come from.

Bob

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Re:Re:Audio Upmixing. It's simple.
by Anthony J Moulen / May 12, 2004 11:16 PM PDT

Actually most audio tracks contain enough information for sophisticated audio tools to upmix to 5.1 type audio. My Bose sound system will upmix stereo VCR output to approximate 5.1 audio. It isn't perfect but it is better than just stereo (occasional audio artifacts happen this way).

If the Stereo audio was matrix encoded it would contain surround information that can be decoded, if it was matrix encoded, I am not sure what can be done to make this work, although you can do variable output to different channels. Here is a page with some more information that may be helpful:
http://web.njit.edu/all_topics/Prog_Lang_Docs/html/mplayer/sound.html

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