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Doctor M's Stereo to 5.1+ Dolby Prologic II Upmix Guide ...
https://originaltrilogy.com/topic/Doctor-Ms-Stereo-to-51-Dolby-Prologic-II-Upmix-Guide/id/11546
If 'ffdshow Audio Decoder" has been added to the chain, go into the options (double click) and clear every checkbox (especially the mixer & Decoder Options). If the audio is pre-processed it may not upmix properly. Drag a line from the 'Out' of 'ffdshow Audio Processor' to the 'In' of your output file (the box will be whatever you named it).
Ffdshow audio + ac3 filter settings for 5.1 spdif ...
https://forum.team-mediaportal.com/threads/ffdshow-audio-ac3-filter-settings-for-5-1-spdif.70814/
I don't think you should enable the mixer in ffdshow audio, because you don't want to upmix stereo to 5.1 because it sounds wrong. I havn't got any 7.1 audio material, so there is no need to downmix from 7.1 to 5.1.
audio upmix .. or not - Kodi
https://forum.kodi.tv/showthread.php?tid=158895
My system WILL upmix, the components are FFDShow (the encoder) and my Pioneer VSX (the decoder), the host operating system, soundcard or it's driver SHOULD be irrelevant providing they are not interfering in the middle of the encode and decode process - if I send a digital 1 or 0 I don't expect anything to change that to 0 or 0 - indeed I don't ...
ffdshow download | SourceForge.net
https://sourceforge.net/projects/ffdshow-tryout/
Download ffdshow for free. A DirectShow and Video for Windows codec (VFW) ffdshow is an advanced DirectShow filter and Video for Windows codec (VFW) codec that supports many audio and video formats. For example: H.264, MPEG-4, MPEG-2, H.263, VP3, VP6, Theora, MJPEG, SVQ3, MP3, AC3, DTS, E-AC3, AAC, and Vorbis.
How to upmix stereo source to 5.1 on windows 10? | Tom's ...
https://forums.tomsguide.com/threads/how-to-upmix-stereo-source-to-5-1-on-windows-10.113409/
I know ffdshow has a dolby pro logic decoder in it, but how do I copnfigure the ffdshow audio decoder settings so I can upmix stereo to 5.1? Do I need a Dolby pro logic II receiver to use the Dolby pro logic II decoder in ffdshow? Do I need a different sound card? Lenovo HD50-55 specs:
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