With these files:
(113MB; sorry, I couldn't reproduce the problem using the start of the clip, so I don't know how to make it smaller)
rendering appears not to terminate. It quickly gets to this point:
$ time melt consumer:render_no_terminate.mlt profile=atsc_1080p_50 -consumer avformat:render_no_terminate.mpg progress=1 f=mpeg acodec=mp2 ab=384k ar=48000 vcodec=mpeg2video minrate=0 b=12000k bf=2 b_strategy=1 trellis=1 aspect=@16/9 threads=1 real_time=-1 s=960x540 progress=1 verbose=1
libdc1394 error: Failed to initialize libdc1394
Current Frame: 266, percentage: 76
and then sits there for at least an hour.
Frame 266 is about where the clip starts.