I took a look at your example MKV file. It turns out that this file (and apparently all MKV files with JPEG video tracks) stores each JPEG frame as a complete JPEG image, including a JPEG header. For RTP streaming, however, we don't include the JPEG header. Therefore, to stream a JPEG video track from a MKV file, we'd need to add an additional filter (not currently implemented) that parses the JPEG header of each frame, to derive/extract out the 'type', 'qfactor', and (if non-standard) the quantization table - to put in the RTP packet.
This is something that might get done sometime in a future, but since JPEG video streaming is a bad idea (that nobody should really be doing in 2014), it's not a high priority for me. Ross Finlayson Live Networks, Inc. http://www.live555.com/
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