python操作音視頻ffmpeg-python對比pyav選擇

更新時間：2023年11月28日 08:43:19 作者：ponponon

這篇文章主要介紹了python操作音視頻的選擇：ffmpeg-python對比pyav,有需要的朋友可以借鑒參考下，希望能夠有所幫助，祝大家多多進(jìn)步，早日升職加薪

ffmpeg 音視頻操作

ffmpeg 是音視頻領(lǐng)域的王者，對音視頻的操作，離不開 ffmpeg

在 python 生態(tài)下面使用 ffmpeg 有兩個著名的庫

ffmpeg-python
pyav

fmpeg-python 對比 pyav

那推薦用哪個呢？

當(dāng)然是后者：pyav

為什么？他兩有什么區(qū)別？

那就是調(diào)用 ffmpeg 的方式不同

ffmpeg-python 是直接調(diào)用 ffmpeg 這個可執(zhí)行程序來操作音視頻的，這就要求你本地安裝 ffmpeg。而且每次操作，都相當(dāng)于是起了一個 ffmpeg進(jìn)程，非常的低效。

而 pyav 是鏈接了 ffmpeg 的動態(tài)鏈接庫 libav，所以不存在每次操作都啟動一個 ffmpeg 進(jìn)程的問題，更加高效優(yōu)雅

使用 ffmpeg-python，如果本地沒有安裝 ffmpeg，就會報錯如下：

In [1]: import ffmpeg
   ...: stream = ffmpeg.input('input.mp4')
   ...: stream = ffmpeg.hflip(stream)
   ...: stream = ffmpeg.output(stream, 'output.mp4')
   ...: ffmpeg.run(stream)
---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
Cell In[1], line 5
      3 stream = ffmpeg.hflip(stream)
      4 stream = ffmpeg.output(stream, 'output.mp4')
----> 5 ffmpeg.run(stream)

File /usr/local/lib/python3.11/site-packages/ffmpeg/_run.py:313, in run(stream_spec, cmd, capture_stdout, capture_stderr, input, quiet, overwrite_output)
    289 @output_operator()
    290 def run(
    291     stream_spec,
   (...)
    297     overwrite_output=False,
    298 ):
    299     """Invoke ffmpeg for the supplied node graph.
    300 
    301     Args:
   (...)
    311     Returns: (out, err) tuple containing captured stdout and stderr data.
    312     """
--> 313     process = run_async(
    314         stream_spec,
    315         cmd,
    316         pipe_stdin=input is not None,
    317         pipe_stdout=capture_stdout,
    318         pipe_stderr=capture_stderr,
    319         quiet=quiet,
    320         overwrite_output=overwrite_output,
    321     )
    322     out, err = process.communicate(input)
    323     retcode = process.poll()

File /usr/local/lib/python3.11/site-packages/ffmpeg/_run.py:284, in run_async(stream_spec, cmd, pipe_stdin, pipe_stdout, pipe_stderr, quiet, overwrite_output)
    282 stdout_stream = subprocess.PIPE if pipe_stdout or quiet else None
    283 stderr_stream = subprocess.PIPE if pipe_stderr or quiet else None
--> 284 return subprocess.Popen(
    285     args, stdin=stdin_stream, stdout=stdout_stream, stderr=stderr_stream
    286 )

File /usr/local/lib/python3.11/subprocess.py:1026, in Popen.__init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags, restore_signals, start_new_session, pass_fds, user, group, extra_groups, encoding, errors, text, umask, pipesize, process_group)
   1022         if self.text_mode:
   1023             self.stderr = io.TextIOWrapper(self.stderr,
   1024                     encoding=encoding, errors=errors)
-> 1026     self._execute_child(args, executable, preexec_fn, close_fds,
   1027                         pass_fds, cwd, env,
   1028                         startupinfo, creationflags, shell,
   1029                         p2cread, p2cwrite,
   1030                         c2pread, c2pwrite,
   1031                         errread, errwrite,
   1032                         restore_signals,
   1033                         gid, gids, uid, umask,
   1034                         start_new_session, process_group)
   1035 except:
   1036     # Cleanup if the child failed starting.
   1037     for f in filter(None, (self.stdin, self.stdout, self.stderr)):

File /usr/local/lib/python3.11/subprocess.py:1950, in Popen._execute_child(self, args, executable, preexec_fn, close_fds, pass_fds, cwd, env, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite, restore_signals, gid, gids, uid, umask, start_new_session, process_group)
   1948     if errno_num != 0:
   1949         err_msg = os.strerror(errno_num)
-> 1950     raise child_exception_type(errno_num, err_msg, err_filename)
   1951 raise child_exception_type(err_msg)

FileNotFoundError: [Errno 2] No such file or directory: 'ffmpeg'

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