Set partial pixel to be transparent in video

[Sean]

Hi, Peter,

Thanks for the clarification. And you're right. The problem comes from that
x264enc doesn't recognized the Alpha channel (or my pipeline sent an invalid
YUV to x264enc). I solved this problem by adding 
compositor" into my pipeline such that "compositor" will take ARGB/AYUV as
input, do alpha blending and output YUV (with Alpha information included).
The, the output YUV will become a valid input to x264enc and the output of
x264enc (test.ts) will have partial transparent pixels.

1. I use offset 0 to modify the Alpha value of ARGB in myelement.
2. Here is the pipeline that works:

gst_launch -v compositor name=comp  ! videoconvert ! x264enc ! mpegtsmux !
filesink location=test.ts videotestsrc pattern=red !
video/x-raw,format=AYUV,width=640,height=480 ! myelement ! comp.sink_0




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