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MF_E_MP3_NOTFOUND
MF_E_MP3_NOTFOUND is an MP3 source parsing failure: the parser did not locate the MPEG audio object it expected. The Media Foundation MP3 file source is a parser that outputs MPEG audio frames; decoding happens later in the pipeline.
Inspect frame discovery rather than the audio renderer
Save the original byte stream and examine the first valid MPEG audio frame position. Leading ID3 metadata can be legitimate, but a media URL can also return an HTML error page, a playlist, an encrypted payload, or a different container with an .mp3 name.
Independent MP3 parsers illustrate why one matching sync pattern is not enough. FFmpeg's MP3 probe walks candidate headers and checks successive frame sizes, while mpg123 has explicit logic to skip junk and parse ID3/LAME information before positioning on a valid frame. Use such a parser to characterize the file, but do not assume its tolerance exactly matches Media Foundation.
Microsoft: MP3 File Source · FFmpeg: MP3 demuxer source · mpg123: frame parser source
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