Is it possible to use Musepack (MPC) audio with video?
At this time it is not yet possible in any container format. The developers of Matroska have plans to include Musepack audio in Matroska, but due to the opinion of the lead developer of Musepack and the bitstream format of Musepack this will not happen until the SV8 bitstream (the next version of Musepack) is finalized. However there may be a Musepack SV7>’SV7.5′ bitstream converter, so your current MPC files might be possible in Matroska in the future.