How to calculate bitrate of WMV/ASF file?

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sevenman
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Joined: Tue Feb 21, 2006 3:57 am

How to calculate bitrate of WMV/ASF file?

Post by sevenman » Tue Feb 21, 2006 4:13 am

Hi All,

I'm a bit confused as to how to calculate the overall bitrate of a WMV file.

getID3 returns the following:

[GETID3_VERSION] => 1.7.5-200512251515
[audio][bitrate] => 221508
[audio][bitrate_mode] => cbr
[video][bitrate] => 19692
[video][bitrate_mode] => cbr
[file_properties_object][max_bitrate] => 360708
[audio_media][bitrate] => 16000
[bitrate] => 360708

However, Windows Media Player reports the following:

bitrate: 230Kbps
audio bitrate: 16 Kbits/s

Now, the "[audio][bitrate]" and "[video][bitrate]" parameters above (221 Kbps/19 Kbps) seem wildly incorrect. I don't know how to interpret those at all.

The "[bitrate]" and "[file_properties_object][max_bitrate]" parameters are identical at 360 Kbps, which you'd expect with CBR encoding, however they're nowhere near the 230Kbps rate that WMP reports.

The only parameter that seems reasonable is "[audio_media][bitrate]" at 16 Kbps.

Can anyone enlighten me?

If it helps, the original file can be downloaded from:

http://media.seven.net.au/video/0602/06 ... ross_h.wmv

Thanks.

sevenman
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Posts: 2
Joined: Tue Feb 21, 2006 3:57 am

no comments?

Post by sevenman » Thu Feb 23, 2006 11:23 pm

Has no one else experienced this problem?

James Heinrich
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Post by James Heinrich » Sun Feb 26, 2006 6:03 pm

The file has two video streams (120kbps, 220kbps). They are now correctly reported (v1.7.6)

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