Hi guys,
okay I realiced how to get five separate wav files into one stream:
ffmpeg -i $fl -i $fr -i $fc -i ${bl}_shift.wav -i ${br}_shift.wav
-filter_complex "[0:0][1:0][2:0][3:0][4:0]amerge=inputs=5,
aresample=matrix_encoding=dplii" out.wav
but I am still not getting correct dplii encoded channels.
Anyone an idea what I am doing wrong?
* how would I do the phaseshift correctly?
* does matrix_encoding=dplii do the mixing or do I have to add another
command ... what does matrix_encoding=dplii do exactly?
thanks for any help
Martin
Am 05.03.2023 um 20:18 schrieb Martin Thomas Schrott:
Hey Guys,
after days of reading documentary, searching the net and all lists,
trying and loosing, I hope someone here can help me to succeed.
I read, some say ffmpeg is not capable of encoding, others say ffmpeg
can do it. Some say it misses the phaseshift of the surround channels,
others and the docu tell, it can.
So after all I found, I would guess ffmpeg should be able to take five
wav files as input and output one wav file in stereo, that is
correctly dolby Prologic II encoded including the phaseshifts. But I
cannot find how this has to be done to work correctly and there is not
a single example anywhere to be found.
I tryed countless ways so I post one of them and hope you can guide me
where to go or what to change to be successful. :-)
This one is with manual phaseshift of the default 0.0 that should be
90 degrees for the two back channels, as nowhere is stated if the
matrix_encoding does apply this automatically.
/Applications/ffmpeg -y -i bl.wav -af aphaseshift bl_phaseshift.wav
/Applications/ffmpeg -y -i br.wav -af aphaseshift br_phaseshift.wav
/Applications/ffmpeg -y -i fl.wav -i fc.wav -i fr.wav -i
bl_phaseshift.wav -i br_phaseshift.wav -map 0 -map 1 -map 2 -map 3
-map 4 -af aresample=matrix_encoding=dplii surround.wav
it gives an error, that a wav file exactly expects one stream. I
thought the matrix_encoding would output the five wav files in one
stereo stream?
If I change to .aac as output I would get a file, but this would not
be a correctly encoded Dolby Prologic II file. This would have
distroyed back channels.
Same if I do not apply the phaseshift manually.
So I am doing something wrong - anybody here who can help me to find
the correct commands?
Would be so thankful. I also did not find a working solution without
ffmpeg, so if someone has an alternative this also would be okay -
even I would prefer the ffmpeg way :-)
best wishes,
Martin
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