subprocess包
import subprocess
def cmd_file_merge(save_url, m3u8_name, save_mp4_name):
process = subprocess.Popen(f"ffmpeg -f concat -safe 0 -i {m3u8_name} -c copy -y {save_mp4_name}", cwd=save_url)
out, err = process.communicate()
print("执行ts文件合并成mp4..\n"