我正在使用ffmpeg和python拆分文件。如果我输入文件路径，我可以分割文件，但如果我从我的mongodb发送文件本身，则会出错。有没有办法让ffmpeg使用文件而不是文件路径运行？
python代码：
args = [ffmpeg_binary,
"-v", "quiet",
"-y", "-i", video_file, "-vcodec", "copy", "-acodec", "copy",
"-ss", "00:00:00", "-t", "00:00:10", "-sn",
output_file_name ]
pipe = sp.Popen(args)
如果video_file是gridfs.grid_file.GridOut个对象或(gridfs.grid_file.GridOut object).read()，我得到：
Traceback (most recent call last):
File "C:/dev/youniversity/test.py", line 21, in <module>
split_vid_from_file(vid_file)
File "C:\dev\youniversity\src\lib\ffmpeg_lib.py", line 107, in split_vid_from_file
pipe = sp.Popen(args)
File "C:\Python27\lib\subprocess.py", line 709, in __init__
errread, errwrite)
File "C:\Python27\lib\subprocess.py", line 957, in _execute_child
startupinfo)
TypeError: must be string without null bytes or None, not str
如何直接从数据库中分割视频？
编辑：我发现你可以这样做：... "-y", "-", ...
pipe = sp.Popen(args, stdin=sp.PIPE)
但我不希望用户输入输入，我想管道变量。