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• How can I run an ffmpeg command in a python script ?

  24 juin 2022, par Nexion21

  I want to overlay a transparent video over top of an image using ffmpeg and python

  


  I am able to do this successfully through terminal, but I cannot get ffmpeg commands to work in python. The following command produces the result that I want in terminal when I am in the directory with the files there.

  


  ffmpeg -i head1.png -i hdmiSpitting.mov -filter_complex "[0:v][1:v] overlay=0:0" -pix_fmt yuv420p -:a copy output3.mov


  


  In python, my code is simple :

  


  import os
import subprocess
command = "ffmpeg -i head1.png -i hdmiSpitting.mov -filter_complex \"[0:v][1:v] overlay=0:0\" -pix_fmt yuv420p -c:a copy output3.mov"
subprocess.call(command,shell=True)


  


  The code runs, there is no indication of an error, but no output is produced.

  


  What am I missing here ?

  


• FileNotFoundError running ffmpeg on Windows from Python subprocess

  4 avril 2023, par mahmoudamintaha

  this is my code to convert mkv to mp4
i created both assets and results folders
i added ffmpeg to user and enviroment variables path

  


  import os
import subprocess

if not os.path.exists("assets"):
    raise Exception("Please create and put all MKV files in assets folder. ")

mkv_list = os.listdir("assets")

if not os.path.exists("results"):
    os.mkdir("results")

for mkv in mkv_list:
    name, ext = os.path.splitext(mkv)
    if ext != ".mkv":
        raise Exception("Please add MKV files only!")

    output_name = name + ".mp4"

    try:
        subprocess.run(
            ['ffmpeg', '-i', f"assets/{mkv}", "-codec", "copy", f"results/{output_name}"], check=True
        )

    except:
        raise Exception(
            "Please, download, install and Add the path FFMPEG to Enviroment variables ")

print(f"{len(mkv_list)} video/s have ben converted")
os.startfile("results")


  


  i get this error messages when i run it

  


  ---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
Cell In[1], line 20
     19 try:
---> 20     subprocess.run(
     21         ['ffmpeg', '-i', f"assets/{mkv}", "-codec", "copy", f"results/{output_name}"], check=True
     22     )
     24 except:

File c:\Users\HP\anaconda3\envs\Projectvenv\Lib\subprocess.py:546, in run(input, capture_output, timeout, check, *popenargs, **kwargs)
    544     kwargs['stderr'] = PIPE
--> 546 with Popen(*popenargs, **kwargs) as process:
    547     try:

File c:\Users\HP\anaconda3\envs\Projectvenv\Lib\subprocess.py:1022, 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)
   1019             self.stderr = io.TextIOWrapper(self.stderr,
   1020                     encoding=encoding, errors=errors)
-> 1022     self._execute_child(args, executable, preexec_fn, close_fds,
   1023                         pass_fds, cwd, env,
   1024                         startupinfo, creationflags, shell,
   1025                         p2cread, p2cwrite,
   1026                         c2pread, c2pwrite,
   1027                         errread, errwrite,
   1028                         restore_signals,
   1029                         gid, gids, uid, umask,
   1030                         start_new_session, process_group)
   1031 except:
   1032     # Cleanup if the child failed starting.

File c:\Users\HP\anaconda3\envs\Projectvenv\Lib\subprocess.py:1491, in Popen._execute_child(self, args, executable, preexec_fn, close_fds, pass_fds, cwd, env, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite, unused_restore_signals, unused_gid, unused_gids, unused_uid, unused_umask, unused_start_new_session, unused_process_group)
   1490 try:
-> 1491     hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
   1492                              # no special security
   1493                              None, None,
   1494                              int(not close_fds),
   1495                              creationflags,
   1496                              env,
   1497                              cwd,
   1498                              startupinfo)
   1499 finally:
   1500     # Child is launched. Close the parent's copy of those pipe
   1501     # handles that only the child should have open.  You need
   (...)
   1504     # pipe will not close when the child process exits and the
   1505     # ReadFile will hang.

FileNotFoundError: [WinError 2] The system cannot find the file specified

During handling of the above exception, another exception occurred:

Exception                                 Traceback (most recent call last)
Cell In[1], line 25
     20         subprocess.run(
     21             ['ffmpeg', '-i', f"assets/{mkv}", "-codec", "copy", f"results/{output_name}"], check=True
     22         )
     24     except:
---> 25         raise Exception(
     26             "Please, download, install and Add the path FFMPEG to Enviroment variables ")
     28 print(f"{len(mkv_list)} video/s have ben converted")
     29 os.startfile("results")

Exception: Please, download, install and Add the path FFMPEG to Enviroment variables 


  


  I checked adding ffmpeg to environment variable and it's added
I used jupyter to know the specific line the doesn't work and it's the subprocess line

  


• create associative data from ffmpeg string result into python

  9 septembre 2018, par Question

  To perform video operations I’m using python with the support of ffmpeg. After I’ve uploaded videos, I need to resize them, so I’ll follow these instructions to calculate the video dimensions :

  link_v = "C:/video/video.mp4"
  
  ffmpeg = "ffprobe -v error -show_entries stream=width,height -of default=noprint_wrappers=1 %s"% link_v
  
  info = check_output(ffmpeg, shell=True)
  
  print(info)

  The console result is something like this :

  width=350
  
  height=350

  But I do not care about this, when it is printed as if it were a string, because the real data would be : b’width=350\r\nheight=350\r\n’ or [’width=350\r\nheight=350\r\n’].

  What I really want to see is an associative data : "width : 350, height : 350", once I get then I would call for example width in the info mode [’width’], how can I get this result ?