[FFmpeg-trac] #4175(swresample:new): Dolby Pro Logic II / Dolby matrix downmixing level balance

FFmpeg trac at avcodec.org
Thu Dec 18 09:07:48 CET 2014


#4175: Dolby Pro Logic II / Dolby matrix downmixing level balance
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             Reporter:  ranutso     |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  swresample
              Version:  git-master  |               Resolution:
             Keywords:  dplii       |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by heleppkes):

 Just to get some clarity..
 You quoted a matrix you used for qaac, and you said this matrix gives you
 a good result, right?

 This quoted matrix has two negative operations for Lt, and two positive
 operations for Rt, just like the swresample code (BEFORE the patch!).

 If anything, the coefficients may be slightly wrong, but the +/- are in
 the proper places from what I can tell.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4175#comment:6>
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