Application - ASFtoPipe

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asftopipe is a simple, open-source Windows utility that extracts audio and video streams from Windows Media ASF files, such as .WMV and .WMA files. Video streams are extracted as a continuous stream of PPM-format images. Audio streams are extracted as raw PCM samples. Both can then be written to named pipes, avoiding the need for gigantic files on disk. Key details such as the audio sample rate, video frame rate, audio sample size and number of audio channels are also available.

http://www.boutell.com/asftopipe/