ChanServ changed the topic of #ffmpeg to: Welcome to the FFmpeg USER support channel | Development channel: #ffmpeg-devel | Bug reports: https://ffmpeg.org/bugreports.html | Wiki: https://trac.ffmpeg.org/ | This channel is publically logged | FFmpeg 7.1.1 is released
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<Richardcavell>
Hello everyone. I'm trying to come up with a command line to do what I want. I want to take a .wav file, which has a single channel, and turn it into raw unsigned 8-bit.
<Richardcavell>
This is what I have so far: ffmpeg -i input.wav -v warning -f u8 -acodec pcm_u8 output.raw
<Richardcavell>
But ffmpeg is saying Guessed Channel Layout: stereo, and that's not what I want
<aaabbb>
you should probably dither if you reduce it to 8-bit btw
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<aaabbb>
if it's saying that it thinks it's stereo, then are you sure it's actually mono? or is it stereo with two identical channels?
<aaabbb>
then instead of output.wav, -f u8 -c:a pcm_u8 output.raw
<aaabbb>
the output of "ffprobe input.wav" pasted to a paste site like bpa.st would be useful in determining if the input is really mono
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<Richardcavell>
I'm getting errors
<Richardcavell>
ffprobe seems to think it's stereo. I could be wrong.
<aaabbb>
if it thinks it's stereo, then chances are it's stereo (even if it's effectively mono with two identical channels)
<Richardcavell>
I have ffmpeg version 6.1.1 and it's giving me
<Richardcavell>
Error applying option 'ich1' to filter 'aresample': Option not found
<aaabbb>
ichl, not ich1 (lowercase L)
<Richardcavell>
Okay. One more thing - I want the final bitrate to be 8192 bytes/second. Do I just put -ar 8192 in there?
<aaabbb>
that's not something you can really do with a raw pcm stream unless you are ok with resampling it
<aaabbb>
why can't you use a compressed format?
<aaabbb>
btw to get more detailed info about the stereo channels: ffmpeg -i input.wav -af astats -f null - 2>&1 | nc termbin.com 9999
<aaabbb>
that will output a link to a paste site
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<Richardcavell>
I'm bitbanging sound synthesis so I need it raw
<Richardcavell>
it's a retrocomputing project
<Richardcavell>
And yes, I want it resampled
<aaabbb>
to get to 8192 bytes per second, or bits?
<Richardcavell>
bytes
<aaabbb>
that would be a resampling to 8192hz (8192 * 8 bits = 65536 bits/s which is 8192 bytes/s). do the filter: aresample=ichl=mono:osf=u8:osr=8192:dither_method=triangular
<aaabbb>
note that you'll be limited to representing sound below 4khz
<Richardcavell>
That's fine
<Richardcavell>
So to summarise, I have ffmpeg -i input.wav -v warning -af 'aresample=ichl=mono:osf=u8:osr=8192:dither_method=triangular' -f u8 -ar 8192 -c:a pcm_u8 output.raw
<aaabbb>
you can drop the -ar 8192
<Richardcavell>
And that will produce unsigned 8 bit mono output as a raw file, correct?
<aaabbb>
because osr=8192 does that
<aaabbb>
it should, yes
<aaabbb>
and actually it might be slightly more efficient to do ochl=mono instead of ichl=mono just because the latter probably inserts an extra filter before it
<aaabbb>
that will mix the two channels together into mono, truncate it to 8 bit unsigned using triangular dither, and will resample to 8192hz, then will save as a raw 8-bit unsigned pcm stream
<aaabbb>
you can also try it with other dither methods or with no dither to see what sounds best for you, but triangular with default strength is rarely bad
<Richardcavell>
okay
<Richardcavell>
Thanks for your help
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<chair1>
wassup! I've read that yuv444p10 can represent 8-bit RGB losslessly. which of BT.709 or BT.2020 do I choose? I'm generating a yuv4mpeg2. it says to write one "plane" at a time, how the hell do I do this in 10-bit? what about endianness, strides, padding etc.?
<chair1>
my objective is to feed ffmpeg a y4m video so that it calculates PSNR and SSIM against another video
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<chair1>
if I decide to also use Netflix VMAF, it supports bit-depths 8, 10 and 12. it doesn't specify any of BT.709 nor BT.2020, I guess these maths are neutral if both videos are same color thing, then the result is deterministic-ish
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<chair1>
honestly I don't care. trial and error. it doesn't matter. I will generate y4m one way, if it doesn't work, I try another way, until it works
<furq>
you can feed rgb24 video directly into ffmpeg
<furq>
it's slightly more annoying but it's less work than preconverting everything
<chair1>
really? I'm totally okay with passing lots of parameters specifying width, height, framerate etc.