ffmpeg -fflags nobuffer \
 -rtsp_transport tcp \
 -i "rtsp://admin:@Unv123456@192.168.10.252:554/unicast/c1/s1/live" \
 -vsync 0 \
 -copyts \
 -vcodec libx264 \
 -movflags frag_keyframe+empty_moov \
 -acodec aac \
 -hls_flags delete_segments+append_list \
 -f segment \
 -segment_list_flags live \
 -segment_time 0.5 \
 -segment_list_size 10 \
 -segment_format mpegts \
 -segment_list video/cctv.m3u8 \
 -segment_list_type m3u8 \
 video/cctv%3d.ts