Change bitrate of LPCM 5.1 ch ( audio file after demuxing )

[wisitch]

I have one issue on audio file , it's LPCM bitrate 6921 Kbps 5.1 ch 24bit 48KHz ( after demuxing ) which is too big size for AVCHD format. Therefore, I want to resize by reducing the said bitrate to be around 4950 Kbps or desired value .
Pls. suggest me program ( on windows 7 ) that has the said function. Thank you so much in advance. Remark : I want to change only bitrate but still maintain 5.1 ch 24 bit 48KHz.

[poisondeathray]

you can't just change the bitrate, because lpcm is uncompressed audio

the only way to lower the bitrate is to use compression , either lossy or lossless

you might encode to AC3 or DTS audio (lossy) , or lossless like TrueHD, or DTS-MA

the only free way is to using AC3 , you might use eac3to to do that conversion

[wisitch]

As per the above reply, if I want to encode LPCM to TrueHD or DTS-MA . To use What is program for encoding ? Pls. suggest me agin.
Thank you so much.

[poisondeathray]

As per the above reply, if I want to encode LPCM to TrueHD or DTS-MA . To use What is program for encoding ? Pls. suggest me agin.
Thank you so much.

It's not free, you need a pro encoding suite, about $1500 USD for DTS-MA , $1000 USD for Dolby Media Encoder SE
e.g.
http://www.dts.com/Pro_Audio_Products/DTS_Products/DTS_HD_Master_Audio_Suite_TM/Overview.aspx

http://www.dolby.com/professional/products/pro-audio/mastering-dvd-hd/dolby-media-producer.html