Re-encoding audio of WVC1

[kapot]

Hi,

I have an .WMV file that uses WVC1 Codec as you can see below.

How do I change the audio bitrate? I need to lower the bitrate from 768 Kbps to 640 Kbps.

Please let me know all necessary softwares and steps to do that.

Thank you.

File info:

General
Complete name : D:\temp\holiday.wmv
Format : Windows Media
File size : 9.93 GiB
Duration : 2h 8mn
Overal bit rate mode : Variable
Overal bit rate : 11.0 Mbps
Maximum overal bit rate : 15.8 Mbps
Encoded date : UTC 2008-03-21 21:36:36.453

Video
Format : VC-1
Format profile : AP@L3
Codec ID : WVC1
Codec ID/Hint : Microsoft
Description of the codec : Windows Media Video 9 Advanced Profile
Duration : 2h 8mn
Bit rate mode : Variable
Bit rate : 10.2 Mbps
Width : 1920 pixels
Height : 804 pixels
Display aspect ratio : 2.35
Frame rate : 23.976 fps
Resolution : 24 bits
Bits/(Pixel*Frame) : 0.277
Language : en-us

Audio
Format : WMA3
Format profile : M2
Codec ID : 162
Codec ID/Info : Windows Media Audio 3
Description of the codec : Windows Media Audio 10 Professional - 768 kbps, 48 kHz, 5.1 channel 24 bit 1-pass CBR
Duration : 2h 8mn
Bit rate mode : Constant
Bit rate : 768 Kbps
Channel(s) : 6 channels
Sampling rate : 48.0 KHz
Language : en-us

[raiechun]

WME9 (Windows Media Encoder 9 Series) recompresses audio stream of your source into a wma file, then a accessory tool of WME9 - the stream editor reumxes the wma file and the video stream of your source into a wmv file that you want.

[benwaggoner]

WME9 (Windows Media Encoder 9 Series) recompresses audio stream of your source into a wma file, then a accessory tool of WME9 - the stream editor reumxes the wma file and the video stream of your source into a wmv file that you want.
Exactly right.

And transcoding from 768 to 640 Kbps WMA Pro should have no perceptible audio degradation at 48 KHz.