ss928v100 sample-vdec 黑屏

ss928v100自带sample中的sample_vdec demo在桌面环境下执行会黑屏吗？？
将自带rootfs替换为带桌面的ubuntu rootfs
执行： ./sample_vdec 1

_sample_test:press ‘e’ to exit; ‘q’ to query!;

chn 0, stream file:3840x2160_8bit.h264, userbufsize: 12441600

q

chn:0, type:96, start:1, decode_frames:147, left_pics:0, left_bytes:0, left_frames:0, recv_frames:147

format_err:0, pic_size_err_set:0, stream_unsprt:0, pack_err:2, set_pic_size_err:0, ref_err_set:0, pic_buf_size_err_set:0

_sample_test:press ‘e’ to exit; ‘q’ to query!;

_sample_test:press ‘e’ to exit; ‘q’ to query!;
e
chn 0 send steam thread return …
[main]-766: program exit normally!

显示日志如上所示
hdmi已连接显示屏，但是显示屏黑屏