Okay I think I may have figured this out. You original WTV file has MPEG2 video which plays back fine on your Xbox extender when you use teh WTV Unprocessed profile (since it does not recode, the converted WTV has MPEG2).
Where as the WTV profile encode it to H264 which does not playback on your extender, so I'm suspecting XBox extender does not support H264 in WTV.
Try this in your WTV profile to confirm, replace ffmpeg-video with:
Where as the WTV profile encode it to H264 which does not playback on your extender, so I'm suspecting XBox extender does not support H264 in WTV.
Try this in your WTV profile to confirm, replace ffmpeg-video with:
ffmpeg-video=-ss 3 -vf yadif=0:-1:1,hqdn3d -vcodec mpeg2video -qscale 6 -map 0:v -sn