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ximagesrc 抓的是黑的 rk的有没有硬件支持 能获取到hdmi输出的yuv数据
@jugg 可以参考这个： https://gitee.com/andyshrk/drm/blob/master/tests/ovltest/ovltest.c 或者 drm 下面writeback 的使用方法参考： https://patchwork.kernel.org/project/dri-devel/patch/20220812231757.1454-3-quic_rohiiyer@quicinc.com/
@jugg 还可以参考下图方法直接dump出buffer
