How Video Stream bitrate Change?

I use VisualStuido2008 MFC / C / C++

I have 2 questions.

LeadTools's Examples DVDAuthor...

1.

I want bitrate 50Mbps.

Setting values -->

ILMMPG2Encoder *m_pIMPEG2Encoder
m_pIMPEG2Encoder->put_Bitrate(50000);

but Result Video Bitrate is 7Mbps.

Setting window is limit Bitrate 10000.

How Change bitrate 50Mbps?

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2.

I Create Streams by filename.

ex..

m_convert->get_SourceFile(&bstr);
strSource = bstr;
SysFreeString(bstr);
m_convert->get_TargetFile(&bstr);
strTarget = bstr;

but I want SteamBuffer.

How use Streambuffer?

There are other settings for the LEAD MPEG2 Encoder that will help you create DVD files with best quality and performance, please read the help topic "ILMMPG2Encoder Interface" for more details.
You can check this topic on this page for our online help:
http://www.leadtools.com/help/leadtools/v17/multimedia/filters/Interfaces/ILMMPEG2Encoder.htm

For example, you need to set the RateControlMethod to MPEG2_VARIABLE_BITRATE using code like this:
m_pIMPEG2Encoder-> put_RateControlMethod(MPEG2_VARIABLE_BITRATE);

Please note that setting a high bit rate beyond a certain value will not cause an increase in video quality unless the video size (width and height) is very large. With standard DVD size (720 × 480 @ 30fps), the maximum uncompressed bitrate is less than 250 MB/s.
MPEG2 compression almost certainly gives you a better compression ratio than 5 to 1, so it's not practical to expect a bitrate of 50MB/s.

About your second question, please post it in a new thread for better service and do not discuss multiple issues in one forum thread. If you open a second thread, please give more details about what you mean by stream buffer and do you want it to be the input or the output of the convert control.