[M4IF Technotes] looking for information

[cloverleafland mail.hongkong.com]

Dear all,
I am currenly searching information about different video products. And i would like to ask is there any commercial products that make use of B frames? 
Please let me know if you know any of them, these information would be very useful. Thanks a lot.
Regards,
Clover
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http://www.linguaphonegroup.com/BannerTrack.asp?EMSCode=HKI03-06ETFJ-0814