how windows media player call third-party Decoder MFT? <p>According the decoder sample in Windows SDK, I realize myself decoder MFT, but there is one question about third-party MFT. I register a amr codec MFT, debug with windows sample code), connect the topology manually, it can play normally. But if I run windows media player, it doesn't play the file include amr codec.</p> <p>What should I do? Windows media player can call my codec MFT automatically.</p> <p>Other question is about MERIT like directshow.</p>