Le 28/01/2019 à 14:11, Carl Eugen Hoyos a écrit :
2019-01-28 9:00 GMT+01:00, pehache <pehach...@gmail.com>:
Le 27/01/2019 à 16:53, Carl Eugen Hoyos a écrit :
2019-01-27 16:44 GMT+01:00, pehache <pehach...@gmail.com>:
I used to apply a Dolby Pro Logic II encoding this way :
Actual command line and complete, uncut console output missing.
ffmpeg -i test.mkv -map 0:1 -c:a aac -b:a 256k -af
aresample=matrix_encoding=dplii -t 300 a.m4a
You get stereo output with:
-af aresample=matrix_encoding=dplii:out_channel_layout=stereo
OK. but what happens to the other channels (back and central) after the
dplii encoding if out_channel_layout=stereo is not coded ? Are thay
identical to the input ones or set to zero ?
And identical output with -af aresample=matrix_encoding=dplii -ac 2
Since "-ac 2" performs a full downmixing according to the page I linked
before, that means the others channels are zeroed ?
Note that the dplii conversion does not do a correct phase shift,
the output does not have optimal quality.
Do you mean in general with the DPLII principle, or specifically in ffmpeg ?
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