[FFmpeg-user] what's wrong with me ?

[bubibabubi]

http://stackoverflow.com/questions/24604689/how-to-join-two-image-to-one-by-ffmpeg


i recently post my ffmpeg problem to sof

Álvaro tell me how to images put togather with tile

using some-file.mp4 is successful with tile

but when i use 2 image, i have still problem 

i can't see second input image in output.jpeg with tile just black image


below is my test batch and output image
ffmpeg.exe -i b.jpg -i a.jpg -filter_complex scale=120:-1,tile=2x1 -s
1920x1080 out.jpeg -y
 
<http://ffmpeg-users.933282.n4.nabble.com/file/n4666346/out.jpeg> 

what's wrong with me ? 
plz warm answer



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