[FFmpeg-user] Upmixing Dolby Pro Logic audio - still not possible?

[Ian Pilcher]

On 4/6/20 10:33 AM, Carl Eugen Hoyos wrote:
> Am Mo., 6. Apr. 2020 um 17:01 Uhr schrieb Ian Pilcher <arequipeno at gmail.com>:
> 
>> Is it possible to do $SUBJECT (with ffmpeg or any other software)?
> 
> https://ffmpeg.org/ffmpeg-filters.html#surround

I see no mention of Dolby Pro Logic on that page, and according to this
comment[1] that filter uses its own (necessarily heuristic) algorithm;
it does not use the Pro Logic channel information embedded in the
source.

I'm interested in doing this in a "lossless" fashion, where the
resulting multi-channel audio is identical to that produced by a
Dolby Pro Logic-enabled AVR.

[1] 
https://patchwork.ffmpeg.org/project/ffmpeg/patch/20170525144546.15459-1-onemda@gmail.com/#12111

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