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Topic: Weird bitrate -display problem (Read 3465 times) previous topic - next topic
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Weird bitrate -display problem

While listening to the first couple of clips at http://www.ff123.net/training/training.html I noticed that at least the four first clips (the ones I have tried yet, applaud_radium128, applaud_insane, castanets_xing128 and castanets_insane) display wrong bitrate. Both 128kbps samples report as 129, applaud_insane reports as 322 and castanets_insane as 323kbps! As I said, it's not a big thing, but I thought I should mention it. Oh, I almost forgot, Winamp shows correct bitrates.

Weird bitrate -display problem

Reply #1 –
are they VBR, do they have VBR header ? (hmm dont look like it, so im looking at them. it may be they have bad xing headers for no reason)
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Weird bitrate -display problem

Reply #2 –
Nope, they're all CBR.

Weird bitrate -display problem

Reply #3 –
They're mp3s with RIFF headers, foobar maybe taking the RIFF header into account when calculating bitrate ??

i dont know what else it might be..

edit: it still shows 129 without the RIFF header.. hmm.. so theres something else wierd about them, but I dont have any time to look at them now..
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Weird bitrate -display problem

Reply #4 –
I think foobar reports bitrates of really short mp3s inaccurately.

i tested with some other mp3s and came to the same conclusions. e.g. 15 frame 192kbit/s reported as 222kbit/s. 6 frame 128kbit/s reported as 192kbit/sec.

its like its missing a frame in its calculation or something...
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Weird bitrate -display problem

Reply #5 –
Wow, I think that makes it first "bug" I found in foobar

Weird bitrate -display problem

Reply #6 –
I wont call it a bug, its like if you calculate an integral, if you have much steps for calculating, then you get more accurate results than if you have less steps. So if a file has f.ex. 10 frames then its difficult to calculate the correct bitrate. Or?
Celeron 1300 Tualatin @ 1589, 512 MB Micronchip CL2, 0,5 TB HD, Audigy 2 ZX Platinum Pro, Sony MDS-JE530 DAC, Sony STR-GX 311 Ampifier, Sennheiser HD 570 Headphones, Creative Inspire T7700 7.1

Weird bitrate -display problem

Reply #7 –
Quote
I wont call it a bug, its like if you calculate an integral, if you have much steps for calculating, then you get more accurate results than if you have less steps. So if a file has f.ex. 10 frames then its difficult to calculate the correct bitrate. Or?

are you sure ? im not saying im right, but the way I was looking at it is if foobar is miscounting the no. of frames in an mp3 by 2, the magnitude of error will increase, and only be significant with few(er) frames.

and (128*6)/4 = 192

(192*15)/13 = 221.5

Im not saying im right, but that's what I thought. But I dont particulary care anyway, I dont have any 15 frame mp3s.
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