meta,
    args = {
         "videotestsrc num-buffers=10 ! interlace ! video/x-raw\(format:Interlaced\),format=I420 ! deinterlace ! video/x-raw ! fakevideosink name=fakevideosink",
    },
    configs = {
       "$(validateflow), pad=fakevideosink:sink, record-buffers=true, buffers-checksum=true",
    }