how to calculate the VBR bitrate mp3 file playback time ?

fufo · 20th March 2002, 07:20

Twilightseer · 20th March 2002, 09:50

VBR changes the bitrate and thus the size of a file, not the song length.

. - .... .- -. .... · 20th March 2002, 11:46

Assuming your file contains MPEG audio, there are three ways to calculate the
total playing time:

1. If the file has a constant bitrate, you can divide the file size by the
bitrate.

2. If the file has a variable bitrate and a Xing VBR header, you can multiply
the playing time of one frame (calculated from the layer and sample rate)
by the number of frames (obtained from the VBR header).

3. In any case, you can sum the playing time of every frame by scanning the
frame headers of the entire file.

At the very least you will have to decode the bitrate, layer, and/or sample
rate from at least one frame header.

fufo · 21st March 2002, 03:33

where can i find the Xing TAG format?

20th March 2002, 07:20	#1
fufo Junior Member Join Date: Mar 2002 Location: ZhuHai,China Posts: 7	how to calculate the VBR bitrate mp3 file playback time ? how to calculate the VBR bitrate mp3 file playback time ?

20th March 2002, 11:46	#3
. - .... .- -. .... Backpacking Moderator Join Date: Nov 2000 Location: საქართველო (Georgia) Posts: 10,104	Assuming your file contains MPEG audio, there are three ways to calculate the total playing time: 1. If the file has a constant bitrate, you can divide the file size by the bitrate. 2. If the file has a variable bitrate and a Xing VBR header, you can multiply the playing time of one frame (calculated from the layer and sample rate) by the number of frames (obtained from the VBR header). 3. In any case, you can sum the playing time of every frame by scanning the frame headers of the entire file. At the very least you will have to decode the bitrate, layer, and/or sample rate from at least one frame header. Like my photography? Buy some here....

21st March 2002, 03:33	#4
fufo Junior Member Join Date: Mar 2002 Location: ZhuHai,China Posts: 7	where can i find the Xing TAG format? where can i find the Xing TAG format?

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20th March 2002, 09:50	#2
Twilightseer Frenchoderator Join Date: May 2000 Location: Lavabo, fond du couloir, 3è porte à droite Posts: 6,311	VBR changes the bitrate and thus the size of a file, not the song length.