Most likely your x264 was build using option --bit-depth=8. Have a look here 
http://video.stackexchange.com/questions/13164/encoding-422-in-10-bit-with-libx264 
<http://video.stackexchange.com/questions/13164/encoding-422-in-10-bit-with-libx264>

hm why must be x264 compiled with 8 or 10bit and not both?
With other codecs this works without problems: ffvhuff, ffv1, DNxHD.
Why is x264 so special in the bitdepth/pixelformat? Can anyone explain this to me please? Maybe is it possible to compile ffmpeg with 2 different libx264 codecs? one for 10 and one for 8bit?

like:
vcodec = libx264
vcodec = libx264_10

Best Regards
Christoph
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