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posted
Provisions for this already exist within the Ranking Criteria, as stated previously.

The only change to come out of this thread is that the provision is changed to reflect actual audio bitrate, not just container bitrate. This would alleviate issues with transcodes being of technically correct container bitrate, but incorrect audio bitrate.

The song's audio file must be of reasonable quality. Reasonable quality is defined as the actual audio bitrate of a beatmap's audio file being no lower than 128kbps and no higher than 192kbps. Transcoded audio files of a lower actual quality than what their bitrate implies is not allowed. If you are having trouble acquiring an appropriate audio file, contact one of the more audio-savvy BN; they will be more than happy t`o help find an mp3 for you.
posted
I'll make a guide on how to tell container quality for the BNs and QATs later this evening. It's not simple.
posted

Ephemeral wrote:

Provisions for this already exist within the Ranking Criteria, as stated previously.

The only change to come out of this thread is that the provision is changed to reflect actual audio bitrate, not just container bitrate. This would alleviate issues with transcodes being of technically correct container bitrate, but incorrect audio bitrate.

The song's audio file must be of reasonable quality. Reasonable quality is defined as the actual audio bitrate of a beatmap's audio file being no lower than 128kbps and no higher than 192kbps. Transcoded audio files of a lower actual quality than what their bitrate implies is not allowed. If you are having trouble acquiring an appropriate audio file, contact one of the more audio-savvy BN; they will be more than happy t`o help find an mp3 for you.
Doesnt change the fact that BNs regularly overlook this rule when ranking a map and QATs rarely DQ maps with mp3s that break this rule unless it is pointed out to them.
posted
t/320007

I just posted this, hopefully it will help some people. In case anyone knows more than me on the subject, please help! Hopefully BNs can check for cutoffs below 15k before they bubble. If they have questions on it, they can confer with other BNs and QATs or just bring it to light before it's qualified/ranked.

We're not going to be perfect, but I think that there are some major issues with low quality audio being ranked.
posted

ziin wrote:

BNs can check for cutoffs below 15k before they bubble.
Something similar would be much more definite over RC's version of "reasonable quality" imo.
posted

sukiNathan wrote:

ziin wrote:

BNs can check for cutoffs below 15k before they bubble.
Something similar would be much more definite over RC's version of "reasonable quality" imo.
I'm a bit worried that
1) nobody knows what the heck the cutoff below 15k is without reading an entire page
2) there are reasonable exceptions to the "rule" that 15khz cutoff is unrankable, such as recorded audio.
3) bad encodes could still be audible but not exactly visible.
posted
The problem is that if people start witch hunting frequency cutoffs, it's going to be as awful as metadata discussion. And NOBODY wants that. The audio "modding" side of things should stick to "Here's a better mp3, please replace your current one." and not "Well, as you can see, the frequencies cut off below xxkhz."
posted
Exactly as I said, there is an issue with for example chiptune and fake chiptune songs. This is Cave Story+ theme, original, best quality available.

posted
Hmm, is Cave Story+ theme different frome the Cave Story theme? http://www.cavestory.org/download/music.php I recorded this from the original ORG files released here...


Chiptunes usually have full spectrums, they just compress really well due to the low bitrate.

@Lach,
Hopefully anyone modding suggesting that the mp3 be replaced will also provide a better quality mp3, but having visual proof of poor quality is always a good thing. I also don't like the way you use "witch hunt" because ranked maps should be perfect, and quality should be checked by the BNs prior to a bubble. I think hhjkl let the cat out of the bag here, then I drop kicked it out when it wasn't sure if it was going out or in.
posted
Yes, Cave Story+ theme is different, it is remastered. And whole game is a bit smoother and so on. Also just checked some piano songs which were also original (I even got them with EAC) and their frequency was low too. Just trust it or not, but some songs just don't have high frequencies even in their original form, so it is definitely not that much reliable. Idea was definitely not the worst, but the rule, in my opinion might be this to prevent some issues:

Audio file must be reasonable quality. Its bitrate should be between 128kbps and *something*kbps. There must not be any encoding error and audio spectrum must be compared with original or highest available quality music file in external program (for example Spek), if there is a big difference in frequencies, it most likely might be an encode error and you have to replace the mp3 with better quality.

We just cannot say: "This song has low frequencies thus it cannot be used, no matter the original is same and it is suppose to be like that", that would not make sense.

Also some Umineko songs seem to have lower frequencies and the higher quality just doesn't exist, so this definitely has to be consulted.
posted
I remember seeing a rejection over "use high(er) quality mp3 for beatmaps" feature request somewhere, since it might turn this site into some kind of "mp3 download site" or something like that. But hey, nothing's wrong with a good audio quality in maps, right?
posted
Since there is already a provision for this in the ranking criteria, I will proceed to flame this. If you wish to have a new rule dealing with the actual audio bitrate as opposed to the container bitrate, please proceed to create a new thread with the appropriate wording.
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