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05:30
<
Richardcavell_ >
Hi. I'm still working on my ffmpeg command line for a Makefile that I'm working on. This is what I have so far:
05:31
<
Richardcavell_ >
ffmpeg -i inputfile -v warning -af 'aresample=ochl=mono:osf=u8:osr=8192:dither_method=triangular' -f u8 -c:a pcm_u8 outputfile
05:31
<
Richardcavell_ >
I want it to remove all frequencies above 3750 hertz
05:31
<
Richardcavell_ >
How do I do that?
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<
furq >
Richardcavell_: firequalizer=gain='if(lt(f,3750),0,-INF)'
05:40
<
Richardcavell_ >
where do I put that in the line?
05:40
<
furq >
before aresample
05:40
<
furq >
also change the single quotes you have to double
05:41
<
furq >
"firequalizer=gain='if(lt(f,3750),0,-INF)',aresample=..."
05:43
<
Richardcavell_ >
Doesn't sound any different to me. There's a lot of hissing.
05:44
<
Richardcavell_ >
This is a retrocomputing project. The final sound is actually 6-bits, not 8. I don't know if it's possible to specify that
05:50
<
furq >
the acrusher filter can do that but it will still output u8
05:51
<
furq >
acrusher=bits=6
05:51
<
Richardcavell_ >
Does it just cut them off or does it alter the sound in other ways?
05:53
<
furq >
i've never used it but from the docs i would assume with no other options set it just zeroes the high bits in every sample
05:53
<
furq >
it's raw pcm so you could check in a hex editor
05:55
<
Richardcavell_ >
I think it zeroes the lowest bits
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