I've been reading the manpages for opusenc, but don't understand how to create multichannel opusfiles. I have 8 wavs that I would like, as a test convert to an 8 channel opus. Can this be done, or have I misunderstood?
Without having to download (or even buy) huge programs, there are 2 free simple ways to accomplish this:
- Avisynth
Open Notepad and enter:
FL=WavSource("FrontLeft.wav")
FR=WavSource("FrontRight.wav")
FC=WavSource("FrontCenter.wav")
LF=WavSource("Subwoofer.wav")
BL=WavSource("BackLeft.wav")
BR=WavSource("BackRight.wav")
FLC=WavSource("FrontCenterLeft.wav")
FRC=WavSource("FrontCenterRight.wav")
MergeChannels(FL,FR,FC,LF,BL,BR,FLC,FRC)
Save as output.avs. Download avs2pipemod. Open a command-prompt:
avs2pipemod.exe -extwav output.avs > output.wav
or to encode immediately to opus (not working yet!*):
avs2pipemod.exe -extwav script.avs | opusenc.exe - output.opus
- Sox - Sound eXchange
Open a command-prompt:
sox.exe -M FrontLeft.wav FrontRight.wav FrontCenter.wav Subwoofer.wav BackLeft.wav BackRight.wav FrontCenterLeft.wav FrontCenterRight.wav output.wav
(-M is the same as/short version of --combine merge)
or to encode immediately to opus (not working yet!*):
sox.exe -M FrontLeft.wav FrontRight.wav FrontCenter.wav Subwoofer.wav BackLeft.wav BackRight.wav FrontCenterLeft.wav FrontCenterRight.wav -t wav - | opusenc.exe - output.opus
When merging to WAV in both cases a WAVEFORMATEXTENSIBLE header will be created in which the channel order will be specified.
=====================================
*For Opus devs:
I guess this has already been mentioned, but piping multichannel PCM is still bugged.
When I'm trying to pipe the "pcm_s16le, 44100Hz, quad, s16, 2822kb/s"-stream of an Avisynth-script with avs2pipemod to opusenc I get this:
avs2pipemod.exe -extwav script-quad.avs | opusenc.exe - output-quad.opus
avs2pipemod[info]: writing 25.500 seconds of 44100 Hz, 4 channel audio.
Skipping chunk of type "fact", length 4
☼", length 101843599e "b
Skipping chunk of type "Ö⌡]ⁿ", length 17496280
avs2pipemod[info]: finished, wrote 25.500 seconds [100%].
avs2pipemod[info]: total elapsed time is 0.063 sec.
Error parsing input file: -
With "pcm_s16le, 48000Hz, 5.1, s16, 4608kb/s" it's a lot worse:
avs2pipemod.exe -extwav script-5.1.avs | opusenc.exe - output-5.1.opus
avs2pipemod[info]: writing 60.000 seconds of 48000 Hz, 6 channel audio.
Skipping chunk of type "fact", length 4
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avs2pipemod[info]: finished, wrote 60.000 seconds [100%].
avs2pipemod[info]: total elapsed time is 3.547 sec.
Error parsing input file: -
Extracting to WAV and feeding that to opusenc works just fine in both cases.
If you need samples, just ask.