For example I use this syntax to spread 2ch source to 8ch target:
-af "pan=8c|c0=c0|c1=c1|c2=c0|c3=c1|c4=c0|c5=c1|c6=c0|c7=c1"
But what can I do when I want this?
c1=c1
c2=c2
c3=silent
c4=silent
c5=silent
c6=silent
c7=silent
c8=silent
I tried to use the anullsrc (to generate silence), but to use that
anullsrc would
be a second audio input stream.
Although I haven't tried it in this context, I suspect the '-map' option
should enable you to specify treatment for individual input streams.
Hi, I tried it this way:
Example with 2ch stereo source, and target has 8ch audio with 2 stereo
pairs, and the other 4 channels are MUTED.
-af "pan=8c|c0=c0|c1=c1|c2=c0|c3=c1|c4=0*c0|c5=0*c1|c6=0*c0|c7=0.c1"
As you can see the channelmapping intormation:
"Pure channel mapping detected: 0 1 0 1 M M M M"
This works good. But is there a syntax to say a simple "c5=mute" instead
of "c5=0*c0" ??
I tried "m" or "mute" or "silent". Didnt work.
CL outout:
C:\Users\gersti>ffmpeg -i I:\audiomixing\8chsound\CHANNEL1+CHANNEL2.wav
-af "pan=8c|c0=c0|c1=c1|c2=c0|c3=c1|c4=0*c0|c5=0*c1|c6=0*c0|c7=0.c1"
-acodec pcm_s16le I:\audiomix
ing\8chsound\8ch_allfull6.wav
ffmpeg version 2.7.1 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.8 (GCC)
configuration: --disable-network --disable-w32threads
--disable-static --enable-shared --enable-version3 --arch=x86
--target-os=mingw32 --cross-prefix=x86_64-w64-mingw3
2- --prefix=/usr/local/win64
libavutil 54. 27.100 / 54. 27.100
libavcodec 56. 41.100 / 56. 41.100
libavformat 56. 36.100 / 56. 36.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 16.101 / 5. 16.101
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.100 / 1. 2.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from 'I:\audiomixing\8chsound\CHANNEL1+CHANNEL2.wav':
Metadata:
encoder : Adobe Audition 4.0.0.1815
(XMPDocOpsTemporal:2008.11.05)
date : 2013-04-22
creation_time : 17:19:34
time_reference : 0
Duration: 00:00:30.00, bitrate: 3075 kb/s
Stream #0:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 48000 Hz, 2
channels, flt, 3072 kb/s
File 'I:\audiomixing\8chsound\8ch_allfull6.wav' already exists.
Overwrite ? [y/N] y
[Parsed_pan_0 @ 0000000001d2c3c0] Pure channel mapping detected: 0 1 0 1
M M M M
Output #0, wav, to 'I:\audiomixing\8chsound\8ch_allfull6.wav':
Metadata:
time_reference : 0
ICRD : 2013-04-22
ISFT : Lavf56.36.100
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 8
channels, s16, 6144 kb/s
Metadata:
encoder : Lavc56.41.100 pcm_s16le
Stream mapping:
Stream #0:0 -> #0:0 (pcm_f32le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
size= 22500kB time=00:00:30.00 bitrate=6144.0kbits/s
video:0kB audio:22500kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 0.000425%
Nest Regards
Christoph
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