Notices by Matthew Skala (mattskala@mstdn.io), page 15

@xahlee @harvhat It calls for some clarity on codec and container formats. You don't want to change the codec format (re-encoding, quality loss) but you probably DO want to change the container format. Not many video container formats are good for holding audio only. The file extension only specifies the container format, and even that would be only if you didn't specify one with -f .

@xahlee @harvhat I think you always have to specify the suffix you want, can use any suffix, and in fact it may try to guess the format from the suffix you used in at least some cases.

@xahlee try ffmpeg -f mp4 -i x.mp4 -map 0:1 -c:a copy x.mpa

-map 0:1 means stream number 1 from file number 0, which would usually be the audio track (edit as necessary). specifying a map at all disables the default map which would be to copy every stream, so you get only the audio, not both. -c:a copy means just copy it, no re-encoding. You may also want to specify a -f for the output to choose a container fomat; I am not sure what it will use by default, probably the same as the input.

@lain we got this covered

and the official answer to "How can I call C functions from assembly language programs?" is "Here's a tutorial on how to call assembly language functions from C!"

so before I get to debug my own code I have to deal with the bugs in the standard libraries AND in the assembler itself

Kemono Fiends

Omae wa mou weremole iru

@lain Is not using a condom what makes it Christian?

@deorsum I don't really disagree. My perspective was only that I object to the blanket dismissal of consonance and dissonance as ever having any meaning at all - which is an extreme position not taken by you. And, that this is an excuse for making a funny image macro.

@deorsum I'd be particularly interested in whether there may be septimal intervals hiding in some of those non-forbidden tritones - as seems to be the case in more recent barbershop-quartet music, where they use vertical tritones a lot, it sounds very good, and (some people think, though this is controversial) it's because they are singing seventh-harmonic just intervals.

@deorsum Augmented fourth and diminished fifth are not necessarily exactly the same interval if you're not using 12-EDO, and that was an historical period during which 12-EDO wasn't a given, especially not in vocal music. Anyway, it's a jump from one historical period's rules for the tritone in particular being arbitrary, to all use of the concept of consonance and dissonance always being arbitrary.

@deorsum Like most nature/nurture arguments it's unlikely that arguing about the objective existence of consonance and dissonance with someone who has already set their mind on one extreme or the other, will be a productive activity.

@deorsum However, there are also relevant physical phenomena which don't depend on subjective opinion or training. There's a physical reason violins are tuned in fifths instead of in tritones and it's not just because of tradition: the fifth has physical properties making it easy to tune accurately in a way the tritone doesn't. Having a word for intervals that are like the fifth in that way is useful, even if we want to be flexible about exactly which intervals we will choose to include.

@deorsum Aw, why'd you have to bring a reasonable big-picture view to a flame war?

For me, it seems clear that what is consonant and what is dissonant is *to some degree* context-sensitive, so that we can't nail down a decision one way or the other on a specific interval and have that decision always be correct in all contexts. It also seems clear that part of the relevant "context" involved is the listener's cultural training. (more)

@deorsum There's backstory. On a Web forum someone made the claim that there is literally no such thing as a dissonant interval, and when I commented that such intervals won't stop existing just because he said so, he threw a tantrum. Responding there would be inadvisable since the guy turns out to be a mod, so I'm venting here.

I'm well aware that there are subtleties to the matter - which make the joke funnier - but simply denying any meaningfulness of the entire concept seems excessive.

@casimal @jk

Imagine all the ham operators who come here to be disappointed that CW doesn't mean what it should.