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JMF, FOBS, and MPEG-4 Subtitles

I would like to be able to read subtitles from a MPEG-4 video stream using JMF.

Pages such as MPEG user data indicate that subtitles can be embedded directly in an MPEG-4 video stream as "picture user data" associated with a frame. Assuming I am able to produce such a video stream, is it possible to consume them with JMF?

JMF can consume MPEG-4 videos by means of plugins such as FOBS. But, this would require that ffmpeg, fobs, and JMF all recognize and expose picture user data. Is this the case?

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