Am 27.08.2018 um 15:00 schrieb Paul B Mahol:
On 8/27/18, Michael Koch <astroelectro...@t-online.de> wrote:
In the first example I have two identical 1kHz sine sources. The first
source is delayed by 0.5ms (which means 180DEG phase shift), and then both
channels are mixed. This works as expected, the result is silence.
ffmpeg -f lavfi -i sine=f=1000:d=5 -f lavfi -i sine=f=1000:d=5
-filter_complex "adelay=0.5,amix" -y test1.mp3
In the second example the only difference is that the other channel is
delayed. The result should be the same. But it doesn't work, the result
isn't silence. Why doesn't it work?
ffmpeg -f lavfi -i sine=f=1000:d=5 -f lavfi -i sine=f=1000:d=5
-filter_complex "adelay=0|0.5,amix" -y test2.mp3
sine audio source filter gives mono output, but you give adelay
options like it is gonna use stereo input.
Thank you! It's working now with this command line:
ffmpeg -f lavfi -i sine=f=1000:d=5 -f lavfi -i sine=f=1000:d=5
-filter_complex "[0:a]adelay=0.0[d0],[1:a]adelay=0.5[d1],[d0][d1]amix"
-y test2.mp3
Michael
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