python - TypeError : expected str, 字节或 os.PathLike 对象，不是 FilterableStream

Question

我正在尝试使用 ffmpeg 将 mp4 视频转换为 jpeg 帧:

 from __future__ import unicode_literals
import argparse
import ffmpeg
import cv2
import numpy as np
import os
from glob import glob
#from __future__ import unicode_literals, print_function
import sys



def main():
    
    try:
        probe = ffmpeg.probe('./frames.mp4')
    except ffmpeg.Error as e:
        print(e.stderr, file=sys.stderr)
        sys.exit(1)

    video_stream = next((stream for stream in probe['streams'] if stream['codec_type'] == 'video'), None)
    if video_stream is None:
        print('No video stream found', file=sys.stderr)
        sys.exit(1)

    width = int(video_stream['width'])
    height = int(video_stream['height'])
    num_frames = int(video_stream['nb_frames'])
    print('width: {}'.format(width))
    print('height: {}'.format(height))
    print('num_frames: {}'.format(num_frames))
    
    
    inputt = ffmpeg.input('./frames.mp4')
    (
        ffmpeg
        .input(inputt)
        .filter('select', 'gte(n,{})'.format(num_frames))
        .output('pipe:', vframes=1, format='image2', vcodec='mjpeg')
        .run()#capture_stdout=True)
    )
        
    
if __name__ == '__main__':
    main()  

结果:

Traceback (most recent call last):
  File "/Users/paula/Desktop/GameOn/video-segmentation-tests/video_to_image.py", line 51, in <module>
    main()   
  File "/Users/paula/Desktop/video_to_image.py", line 42, in main
    ffmpeg
  File "/opt/anaconda3/lib/python3.9/site-packages/ffmpeg/_run.py", line 313, in run
    process = run_async(
  File "/opt/anaconda3/lib/python3.9/site-packages/ffmpeg/_run.py", line 284, in run_async
    return subprocess.Popen(
  File "/opt/anaconda3/lib/python3.9/subprocess.py", line 951, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/opt/anaconda3/lib/python3.9/subprocess.py", line 1754, in _execute_child
    self.pid = _posixsubprocess.fork_exec(
TypeError: expected str, bytes or os.PathLike object, not FilterableStream

我尝试更改路径，尝试设置 argparse 而不是直接设置路径，搜索类似问题......但没有任何效果。
我还在 ffmpeg 文档中进行了搜索。

Answer 1

尝试:

ffmpeg.input('./frames.mp4') \
      .filter('select', 'gte(n,{})'.format(num_frames)) \
      .output('pipe:', vframes=1, format='image2', vcodec='mjpeg') \
      .run()#capture_stdout=True