【发布时间】:2017-05-08 04:43:52
【问题描述】:
我在我的 mac (macOS Sierra) 上安装了 ffmpeg 和 ffprobe,并且我已将它们的路径添加到 PATH。我可以从终端运行它们。
我正在尝试使用ffprobe 使用以下代码获取视频文件的宽度和高度:
import subprocess
import shlex
import json
# function to find the resolution of the input video file
def findVideoResolution(pathToInputVideo):
cmd = "ffprobe -v quiet -print_format json -show_streams"
args = shlex.split(cmd)
args.append(pathToInputVideo)
# run the ffprobe process, decode stdout into utf-8 & convert to JSON
ffprobeOutput = subprocess.check_output(args).decode('utf-8')
ffprobeOutput = json.loads(ffprobeOutput)
# find height and width
height = ffprobeOutput['streams'][0]['height']
width = ffprobeOutput['streams'][0]['width']
return height, width
h, w = findVideoResolution("/Users/tomburrows/Documents/qfpics/user1/order1/movie.mov")
print(h, w)
很抱歉,我无法提供 MCVE,因为我没有编写此代码,而且我真的不知道它是如何工作的。
它给出了以下错误:
Traceback (most recent call last):
File "/Users/tomburrows/Dropbox/Moviepy Tests/get_dimensions.py", line 21, in <module>
h, w = findVideoResolution("/Users/tomburrows/Documents/qfpics/user1/order1/movie.mov")
File "/Users/tomburrows/Dropbox/Moviepy Tests/get_dimensions.py", line 12, in findVideoResolution
ffprobeOutput = subprocess.check_output(args).decode('utf-8')
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 626, in check_output
**kwargs).stdout
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 693, in run
with Popen(*popenargs, **kwargs) as process:
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 947, in __init__
restore_signals, start_new_session)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 1551, in _execute_child
raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: 'ffprobe'
如果 python 没有从 PATH 文件中读取,我如何指定 ffprobe 的位置?
编辑:
看来 python 路径与我的 shell 路径不对齐。
在每个程序的开头使用os.environ["PATH"]+=":/the_path/of/ffprobe/dir" 可以让我使用ffprobe,但为什么我的python 路径可能与我的shell 路径不同?
【问题讨论】:
-
要验证确实是
$PATH相关的问题,为什么不给出完整的路径,而不是依靠shell环境为你做呢?例如。使用cmd = "/full/path/to/ffprobe -v quiet -print_format json -show_streams"
标签: python ffmpeg path subprocess pythonpath