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(https://support.microsoft.com/kb/256986/EN-US/ )Description of the Microsoft Windows Registry
When you are playing streaming audio and video from the Internet in Windows Media Player by using a "hybrid" Internet connection (for example, an analog modem uplink and cable modem/DSL downlink), only the audio portion may be streamed, and the bit rate may show a much lower rate than is actually available.
This behavior occurs because the connection speed reported by the analog modem (TAPI) causes Windows Media Player to believe the bandwidth between the client and the server to be artificially low.
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To override the bandwidth detection logic (for Windows Media Player version 6.4.7.xxxx or later), create a DWORD registry value named ManualBandwidth in the following registry key:
HKEY_CURRENT_USER\Software\Microsoft\Netshow\Player\GeneralSet the data value, in bits per second, corresponding to the downlink bandwidth that is actually available.
Individual bandwidth measurements are stored in the registry (in bits per second) every time you open a streaming file from a new Microsoft Windows Media Services (WMS) server (version 220.127.116.1157 or later) by using the Microsoft Media Server (MMS)protocol. The measurements are stored in the following registry key:
HKEY_CURRENT_USER\Software\Microsoft\Netshow\Player\Remote\HistoryThe values in this key are automatically flushed every time the client obtains a new IP address. If the client IP address has not changed recently and there are no readings in this key, the client is not communicating with a newer server. This is why the problem occurs on a hybrid network.
If the links to the files being streamed are HTTP links, Windows Media Player cannot empirically determine the bandwidth, so it must either rely on the history from MMS connections stored in the registry or use the speed the modem reports. This can be an issue for hybrid connections.
The new ManualBandwidth value overrides all detection logic, no matter what server the client is communicating with.