Why Gstreamer change explicitly declared caps of appsrc in runtime?

[sarslan]

Hello,
I wrote raw frame to file before send it to the pipeline.
Then I display it with "https://rawpixels.net/" and vooya(raw image viewer
in linux).
>From both method, I saw that the format of the raw frame is NV12. I upload
the file in here.
I view this file in "https://rawpixels.net/" with the following settings:
height:720, width: 1280, Predefined format: NV12, Pixel format: YUV.

And also I tried to insert videoconvert block just after the appsrc. In this
block, I tried to convert format to NV12 but this is not work also.
out_test.nv12
<http://gstreamer-devel.966125.n4.nabble.com/file/t379659/out_test.nv12>  



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