Many false positives from mp3 from Windows Media Player + mp3 converted to wave
Posted by board on
URL: http://fakin-the-funk.125.s1.nabble.com/Many-false-positives-from-mp3-from-Windows-Media-Player-mp3-converted-to-wave-tp86.html
I'm using version 1.5.0.106 of Fakin' The Funk, and I've been quite happy with it, as it has spotted several fake files in my music library. I've checked "detect fakes above 256", so that should be okay.
I've been using Windows Media Player to rip my own CDs to mp3, but Fakin' The Funk has shown me that there's something seriously wrong with its mp3 encoder, since what was supposed to be 320 kbps turns out to be more or less 128 kbps with a bit of higher frequencies seeping through.
And unfortunately, Fakin The Funk rarely detects this.
Here are screenshots of three fake files that it did detect:
The first one here was ripped as 320 kbps, but is reported as 160 kbps, although it's really closer to 128 kbps. This also applies to the other two - they were reported as fake, but not at the right kpbs-rate :-(.
But most fake files are verified as being okay (reported as 320 kpbs when they're not). The following were all given the thumbs up. The first song is from the same album as the last of the three above and also ripped by me:
For this one it's more understandable why it was reported as being okay:
It seems to me that the high frequencies that have seeped through is the reason why the programme gives these files the thumbs up, but apparently some files are considered fake (like the first three pictures I posted) despite having high frequency content. So it's a bit hit and miss.
Then there are mp3 files that were okay, but then I converted them to wave with Foobar (no use of dither), and then Fakin' The Funk said they were actually 1411 kbps. I do see that the conversion sometimes adds a bit of faint noise at the very highest frequencies.
Mp3:
Mp3 converted to wave:
The following file is the mp3 version 128 kpbs:
Then here's the same file converted to Wave with Foobar, and then it's reported as 256 kbps:
As you can see, they look identical.
In the following file it's a bit more difficult to spot that there's a cut-off at 128 kbps:
Here's the same song ripped as wave:
I have several other files like the above - both passed and failed, so this is just a sample.
This post is not meant as a criticism, as I have been quite happy with the programme – I just thought I would mention it in the hopes that it could be improved :-).
URL: http://fakin-the-funk.125.s1.nabble.com/Many-false-positives-from-mp3-from-Windows-Media-Player-mp3-converted-to-wave-tp86.html
I'm using version 1.5.0.106 of Fakin' The Funk, and I've been quite happy with it, as it has spotted several fake files in my music library. I've checked "detect fakes above 256", so that should be okay.
I've been using Windows Media Player to rip my own CDs to mp3, but Fakin' The Funk has shown me that there's something seriously wrong with its mp3 encoder, since what was supposed to be 320 kbps turns out to be more or less 128 kbps with a bit of higher frequencies seeping through.
And unfortunately, Fakin The Funk rarely detects this.
Here are screenshots of three fake files that it did detect:
The first one here was ripped as 320 kbps, but is reported as 160 kbps, although it's really closer to 128 kbps. This also applies to the other two - they were reported as fake, but not at the right kpbs-rate :-(.
But most fake files are verified as being okay (reported as 320 kpbs when they're not). The following were all given the thumbs up. The first song is from the same album as the last of the three above and also ripped by me:
For this one it's more understandable why it was reported as being okay:
It seems to me that the high frequencies that have seeped through is the reason why the programme gives these files the thumbs up, but apparently some files are considered fake (like the first three pictures I posted) despite having high frequency content. So it's a bit hit and miss.
Then there are mp3 files that were okay, but then I converted them to wave with Foobar (no use of dither), and then Fakin' The Funk said they were actually 1411 kbps. I do see that the conversion sometimes adds a bit of faint noise at the very highest frequencies.
Mp3:
Mp3 converted to wave:
The following file is the mp3 version 128 kpbs:
Then here's the same file converted to Wave with Foobar, and then it's reported as 256 kbps:
As you can see, they look identical.
In the following file it's a bit more difficult to spot that there's a cut-off at 128 kbps:
Here's the same song ripped as wave:
I have several other files like the above - both passed and failed, so this is just a sample.
This post is not meant as a criticism, as I have been quite happy with the programme – I just thought I would mention it in the hopes that it could be improved :-).
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