Windows Media Player does not negotiate media types for DMO DSP plug-ins on Vista

Here is an interesting issue I ran across writing Windows Media Player (WMP) custom DSP plug-ins. When I am prototyping a new filter or plug-in for DirectShow or WMP, I will usually write my transform’s algorithm using a single format / media type. Once I have the algorithm working with this single media type I’ll…

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Using the WM Encoder to Protect Existing Content with WM DRM

One of the things that a lot of DRM savvy CDNs are doing is to use WM Encoder to add WM DRM to their content without actually re-encoding. This is basically a copy operation from the input file (WMV) to an output file (WMV). The samples are never decompressed but rather passed directly through the…

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