according to this you can mux baseline profile h264 into mxf

Also should be supported:

dv video (with better 4:2:2 subsampling) 

mpeg2 (not sure about GOP size?) 

Avc-intra 100 (intra-only variant of h264 with yuv422p10le colorspace, 100 mbit/s) 

audio is pcm, 16 or 24 bit

please try? 

put mxf_pcm* into ffmpeg/audio and rest in ffmpeg/video, try to render those and see if other NLEs or tools accept those files...