运行 bash 脚本（该脚本在 VLC 上打开视频）的 Python 文件无法正常工作

Question

我有一个有效的 bash 脚本，可以根据终端上按下的不同键在 vlc 中打开不同的视频。当视频正在播放但我按另一个键时，当前视频会停止，并开始再现新视频。但因为我不想显示终端，所以我创建了一个使用 subprocess 库打开 bash 脚本的 Python 脚本。它显示一个用 pygame 制作的界面（目前它只显示黑屏，我只是需要它），它还处理 keydown 事件，然后将其发送到在后台运行的 bash 脚本（该脚本打开 vlc 并重现视频）。每当我尝试以这种方式打开视频时，vlc 都会闪烁然后消失，根本不再现任何内容。其他选项（比如按 k 关闭程序）工作得很好，所以它一定是 vlc 的东西

bash 脚本

#!/bin/bash

kill_vlc () {
    # Check if VLC is running and kill it
    if pgrep -x "vlc" > /dev/null; then
        pkill -x "vlc"
        # Adding a small sleep to ensure VLC fully closes before trying to open a new instance.
        sleep 1
    fi
}

declare -A videos

# load video mappings from file
# the file has this form:
# 3=/path/to/video/video3.mp4
# 2=/path/to/video/video2.mp4
# 1=/path/to/video/video1.mp4

while IFS="=" read -r key path; do
    videos["$key"]="$path"

done < <(grep '=' video_mappings2.txt)


# echo the names
for key in "${!videos[@]}"; do
    video_path="${videos[$key]}"
    video_name="$(basename "$video_path")" # extract filename
    video_name_woutext="${video_name%.*}" # remove extension
    
    echo "> Key: $key, Video: $video_name_woutext"

done

echo ""
echo "> Press a key to play a video (options: ${!videos[@]})"
echo "> Press 'q' to quit the video" 
echo "> Press 'k' to close the program"

# main loop
while true; do
    read -s -n 1 key

    # Close the script
    if [[ $key == "k" ]]; then
        echo "> Closing..."
        
        # Check if VLC is running and kill it
        kill_vlc

        break
    fi

    # Close the video
    if [[ $key == "q" ]]; then
        
        # Check if VLC is running and kill it
        kill_vlc
    fi

    # Check if VLC is running and kill it
    kill_vlc

    # Check if the key is in the videos array
    if [[ ${videos[$key]} ]]; then
        vlc ${videos[$key]} --play-and-exit &
    fi

done

python 文件

import pygame
import subprocess
import os
import time

pygame.init()
screen = pygame.display.set_mode((800, 600))
clock = pygame.time.Clock()

# Start the Bash script as a subprocess
bash_process = subprocess.Popen(["./video_player.sh"],
                                stdin=subprocess.PIPE,
                                stdout=subprocess.PIPE,
                                stderr=subprocess.PIPE,
                                text=True)

# Function to display the still image
def display_still_image():
    screen.fill((0, 0, 0))
    pygame.display.flip()


running = True
display_still_image()

while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

        if event.type == pygame.KEYDOWN:
            key_pressed = chr(event.key)
            print(key_pressed)

            # Send the key to the Bash script
            bash_process.stdin.write(key_pressed + "\n")
            bash_process.stdin.flush()

    # Check if the Bash script has finished
    if bash_process.poll() is not None:
        break

    # Redraw the still image
    display_still_image()

    # Control frame rate
    clock.tick(30)

# Close the subprocess
bash_process.stdin.close()
bash_process.stdout.close()
bash_process.stderr.close()
bash_process.terminate()

# Quit pygame
pygame.quit()

我还从 WSL 和 Raspberry OS 运行 python 脚本，也发生了同样的问题。 我尝试了另一个视频播放器（mpv），问题仍然存在。

Answer 1

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我认为你的问题出在 bash 脚本的第 63 行，它会在每次按键时杀死 vlc。

# Check if VLC is running and kill it
kill_vlc

如果你真的想继续这个过于复杂的结构，我会首先确保 bash 脚本在集成到 python 中之前正确运行。