videotestsrc NV12 appsink can't get GstMeta

[Heryo Wang]

I have a appsink with callback getting GstMeta from every sample, it worked
well with file source and camera source, but when I try to test it with
videotestsrc, I found that I can't get GstMeta by "gst_buffer_get_meta", all
I got is null pointer.

error :
Unable to read ionBufFd from buffer 0x7f680271b0

My pipeline is simple as:
videotestsrc ! video/x-raw,format=NV12 ! appsink
I have to make it in NV12 for further usage.

Could anyone tell me what's wrong with it ?

Thanks!



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