Sound quality – evaluations, bit rates …, page 1

I am opening this topic for a discussion about sound quality of some specific sets for which a torrent file has been upload.
And the reason is: I see a need of such a discussion.

The sound quality is not easy to evaluate. The (new) upload page requires that the sound quality be evaluated by the bit rate of an mp3 file, which is supposed to contain the music. In other words a container is used as a measure of what is inside it which is a little bit strange for me.

It is obviously that the content depends on the source and the filler of the container not on the container itself. The container could serve as estimation from above of what is inside of it. Or, you can not put more than the container can hold. In terms of an mp3 container, you can not preserve better sound quality than the corresponding mp3 file can preserve. But you can put worse sound quality music.

I offer sound files for shows having been already offered. In such cases I usually check the existing file and I usually find discrepancies

Here is an example. (I am not conducting investigation here.)
I am going to upload a torrent for the Matt Darey’s radio show Nocturnal on BPM (XM81). There are torrent files for both parts of the show with a source DI.Fm. As long as nothing more is said about the source I assume it was the Internet Radio DI.fm.
The Internet Radio DI.fm has a Premium Service which offers streams at different bit rates: 192 kbps, 128kpbs and so on.
The torrents for the show say the music files are 192 kbps mp3s which implies the sound quality corresponds to an mp3 @192 kbps container. But it does not correspond to it. The sound quality corresponds to an mp3 @128 kbps container.
There are many files shared here, ripped from an FM radio broadcasts which are band limited to about 16 kHz, that could be recorded in mp3 @128 kbps without loosing sound quality but they are mp3s @192 kbps. I could accept this as ignorance of the release group rippers but in case of DI.fm it is not clear to me why the ripper has used an mp3 @192 kbps. The DI.fm’s stream is clearly announced and I do not believe DI.fm radio streams a 15.4 kHz signal as a 192 kbps bit stream.

The same thing with the last Armin's ASOT mix (#296). It has been offered as an mp3 @224 kbps from the source DI.fm which stream is @192 kbps!

Putting a band limited music in a container that can hold wider bandwidth signal makes no sense. It increases only the file size, nothing more.

Well I'm sorry to say that but I really don't care that much of all this as as mentioned in other topics I'M NOT A SOUND ENGINEER which means as long the soung quality (not the bitrate as sometimes you can have bad recordings with hogher bitrate) is cool and there are no couldn't figure out the word (a bit drunk in the moment) ... f@#$k this mind forget it

But the thisng is that what really matters is the music the dj the tracks and the feeling and some Khz ot bitrate can't brake this

I can't understand why when you have really good 192 kbps version that si with realy good quality (ex. the essential mixes from inbeats) we need another one in m4a and one in 320 kbps mp3 and so on

Just my opuinion but for me what it matters is only the nmusic not the bitrate

     

That all works for me except right now I'm listening to an Armin set that is supposedly 192 bitrate but it's got nasty skips and hops in it, which quite distracts from the music. I wouldn't be at all opposed to another upload of it that doesn't have the glitches in the song, even if it were at a lower bitrate.

As I have already said the sound container (the file) can not be a satisfactory evaluation of the sound quality.
To show it is true I am seeding the last Carl Cox’s Global show on Kiss100 so as every one can compare the original TALiON group’s files, encoded @(avg) 183 and the same - recoded @(avg)130 kbps.
The files have (almost) the same spectra which mean the sound signals are (almost) the same and hence: the sound quality is (almost) the same.
I am saying almost to be as strict as possible but the real differences, if you can find them, are really very small.
The Kiss100 signal spectrum obviously is band limited to about 16 kHz which makes it possible to be encoded as an mp3@128kbps.
Three more things to mention:
• Although this is a kind of experiment I did not use the files provided by Matev#1 (many thanks for uploading them). You can see my ratio as a seeder of these files is inf.
• I can not seed mp3 (the same file format) files at lower bit rate when there are files at higher bit rate present, hence my files are m4a. They could even be at lower bit rate as AAC encoder is more effective but I am not comparing the encoders.
• I have recoded the file from the Felix Kroecher’s show the same way for the same reason

@SpasV: you seem to be a discussion whore - you always get it wrong but defend your theories like no other!

The mp3@224kbps is the original and unmodified stereo MP3@192kbps with 32kbps joint 5.1 layer added with the Fraunhofer (!!!) mp3SX converter. Joint stereo @ 192kbps + joint 5.1 @ 32kbps = 224kbps.

THESE 224kbps MP3 FILES CONTAIN THE ORIGINAL STEREO BROADCAST! There is no decoding or transcoding involved, the 32 kbps layer has been added without modifying the original broadcast.

bullshit

lol....HAHAHAHA    

Ah you know it better as the Fraunhofer guys, the inventors of MP3?? Who is talking bullshit here??

https://www.iis.fraunhofer.de/fhg/iis/EN/bf/amm/mp3sur/index.jsp
https://www.all4mp3.com/info/mp3sx.html

Sorry, arnani and bidona, should I take you two serious in the future? Really good uploaders but not even knowing the most basic stuff about mp3s?

its not about all these 224 5.1 blah blah, its about the torrents that have nothing to do with 5.1, noone broadcast 5.1 sound, furthermore DI stream

therefor u cant have 5.1 sound for Armin DI torrent, can u mr wise guy?

You can, if you want Scroll down the following page and look for "Shoutcast Broadcaster" : https://www.iis.fraunhofer.de/fhg/iis/EN/bf/amm/mp3sur/downld/index.jsp

And sure, you can have 5.1 sound in Armins ASOT, to cite: "MP3 SX creates natural surround sound as it does not apply artificial reverberation."

It takes the already existing surround info from a stereo file and extracts it, not more, not less

now thats the bullshit i'm talking about