1）使用 mpv --vo=gpu test.mp4 显示 不正常，一半黑屏。
2）使用 mpv --vo=drm test.mp4 无法硬解，会回滚到软件。提示如下：
[vo/drm] VT_GETMODE failed: Inappropriate ioctl for device
[vo/drm] Failed to set up VT switcher. Terminal switching will be unavailable.
Using hardware decoding (rkmpp).
No video PTS! Making something up. Using 25.000000 FPS.
[autoconvert] can’t find video conversion for drm_prime/nv12
Cannot convert decoder/filter output to any format supported by the output.
AO: [pulse] 48000Hz 5.1 6ch float
Falling back to software decoding.
请问可能是什么原因，如何解决呢？