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2nd UPDATE:
Problem was by natural source. The light reflects from window into camera. 2nd problem was using file as buffer.
I solved it by using grab image from QCameraViewFinder widget and send by memory.
@LuGRU Thank sir for your replay.. yes i solve my problem.
Yes. I wrote to QtGstreamer Author.
ANSWER: AppSrc gstreamer class for buffer push is here: https://github.com/detrout/qt-gstreamer/…/src/QGst/Utils