帮我用shell实现当rviz启动时开始自动录制rviz的画面，当rviz进程被杀死时保存录制的视频

Sure, 我可以帮你实现。你可以使用以下命令：

#!/bin/bash

# Path where to save the video
VIDEO_PATH="/path/to/save/video"

# Start recording when rviz process starts
while true; do
    if pgrep -x "rviz" > /dev/null; then
        echo "rviz process found, starting to record video"
        current_time=$(date "+%Y.%m.%d-%H.%M.%S")
        gnome-terminal -e "rosrun image_view video_recorder image:=/rviz/camera1/image_raw _filename:=${VIDEO_PATH}/rviz-${current_time}.avi"
        break
    fi
done

# Stop recording when rviz process is killed
while true; do
    if ! pgrep -x "rviz" > /dev/null; then
        echo "rviz process is no longer running, stopping video recording"
        sleep 5
        killall gnome-terminal
        break
    fi
done

这个脚本会等待rviz进程启动，一旦找到rviz进程，它将在新的终端窗口中运行rosrun image_view video_recorder节点，开始记录rviz画面。当rviz进程被杀死时，脚本将停止录制并关闭视频记录器节点。