Media Foundation MP4 Media Source gets a bit too tired when doing too much work

It appears there is a sort of a limitation (read: “a bug”) in Media Foundation MPEG-4 File Source implementation when it comes to reading long fragmented MP4 files.

When respective media source is used to read a file (for which, by the way, it does not offer seeking), the source issues a MF_SOURCE_READERF_ENDOFSTREAM before reaching actual end of file.

When some software sees a full hour of video in the file…

… Media Foundation primitive, after reading frame 00:58:35.1833333, issues “oh gimme a break” event and reports end of stream.

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