使用ffmpeg逐帧编写视频 [英] Writing a video frame by frame using ffmpeg

问题描述

我正在尝试使用ffmpeg逐帧编写视频，如下所述:

I am trying to write a video frame by frame using ffmpeg as explained here: http://zulko.github.io/blog/2013/09/27/read-and-write-video-frames-in-python-using-ffmpeg/

但是，我总是收到 OSError:[Errno 22]无效的参数.我在Windows 7上并使用Python 3.4.这是代码:

However, I am always getting an OSError: [Errno 22] Invalid argument. I am on Windows 7 and using Python 3.4. Here is the code:

import subprocess as sp
import numpy as np
import time

ffmpeg_bin = r'C:\path\to\ffmpeg\ffmpeg.exe'

command = [ffmpeg_bin,
           '-y', # (optional) overwrite output file if it exists
           '-f', 'rawvideo',
           '-vcodec','rawvideo',
           '-s', '420x360', # size of one frame
           '-pix_fmt', 'rgb24',
           '-r', '24', # frames per second
           '-i', '-', # The imput comes from a pipe
           '-an', # Tells FFMPEG not to expect any audio
           '-vcodec', 'mpeg',
           'my_output_videofile.mp4' ]

proc = sp.Popen(command, stdin=sp.PIPE, stderr=sp.PIPE)

a = np.zeros((360, 420, 3), dtype=np.uint8)

for ii in range(5*24):
    print(ii)
    proc.stdin.write(a.tostring())
    time.sleep(1/24)

proc.stdin.close()
proc.stderr.close()
proc.wait()

非常感谢您的帮助.

根据此处的要求，该程序的详细输出

As requested here the detailed output of the program

0
1
Traceback (most recent call last):
  File ".\write_dummy_video.py", line 25, in <module>
    proc.stdin.write(a.tostring())
OSError: [Errno 22] Invalid argument

有趣的是，如果我注释第26行(即 time.sleep(1/24))，则错误消息会稍有变化，但循环仍然只运行两次.错误输出如下:

Interestingly, if I comment line number 26 (i.e. time.sleep(1/24)) the error message changes slightly but the loop still only runs twice. Here is the error output:

0
1
Traceback (most recent call last):
  File ".\write_dummy_video.py", line 25, in <module>
    proc.stdin.write(a.tostring())
BrokenPipeError: [Errno 32] Broken pipe

推荐答案

将字符串"mpeg"更改为"mpeg4"

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