I have 2 files I tried to render in a timeline. The first file is video only, the 2nd has both video and audio. It failed in 2 different ways:

1) Rendering the files back-to-back, with a crossfade transition in between, yielded this error:

./ges-launch-0.10 -o file:///home/jan/test1.avi -r ~/media/avi/xgl-demo1.xvid.avi 0 45 +transition crossfade 3.5 ~/media/avi/tripod.avi 0 45
Adding clip file:///home/jan/media/avi/xgl-demo1.xvid.avi inpoint:0:00:00.000000000 duration:0:00:45.000000000
Adding <transition:crossfade> duration 0:00:03.500000000
Adding clip file:///home/jan/media/avi/tripod.avi inpoint:0:00:00.000000000 duration:0:00:45.000000000
0:00:00.116598900  7306      0x1277010 ERROR         gnlcomposition gnlcomposition.c:2003:compare_relink_single_node: Not enough sinkpads to link all objects to the operation ! 2 / 1

2) Removing the transition from the timeline, the command renders to completion without errors, but the resulting file has no audio-video synch because the audio from the 2nd file commences immediately, playing alongside the 45 seconds of the first file where there should be silence.