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• write to file and use ffmpeg simultaneously to convert current file

  15 avril 2015, par Zakukashi

  Here’s my use-case :
  User uploads a video file.avi (2GB) to my server, the server slowly writes the bytes to a file. Can I use ffmpeg in a way that it will tail the file being written and convert it to a new file.mp4 ? I tried using the normal approach from file.avi to file.mp4 but after some time ffmpeg says read error. Im assuming that it runs out of bytes to convert thus beating the upload speed. Can I just have it tail the file ?

• How do I pass a file path with spaces as an argument in FFmpeg/cmd via python ?

  12 octobre 2022, par At Bay

  Basically the code below is taking wav files saved in a folder location ufolder, and trimming them to one minute clips and saving those clips in a new folder dfolder. I'm using python, cmd, and ffmpeg to do this.

  


  The problem is that the original folder location has spaces in it, so I get an error which reads : W:\ARCHIVESNAS1\INGEST\01: No such file or directory

  


  If I were to use cmd directly, I would circumvent this problem with quotes.

  


  ffmpeg -ss 0 -t 10 -i "W:\ARCHIVESNAS1\INGEST\01 PLEASE REVIEW\Levy\GeorgeBloodShipments\_6-Ready-for-Ingest\SREDReels20210805\26368\data" "C:\Users\myname\Downloads\practice"


  


  How do I include quotes with a command that's using variables. Adding quotes, as I do immediately below, doesn't work.

  


  os.system("ffmpeg -ss 0 -t 10 -i **"{0}" "{1}"**".format(filepathO, filepathN))


  


  import os
ufolder = r'W:\ARCHIVESNAS1\INGEST\01 PLEASE REVIEW\Levy\GeorgeBloodShipments\_6-Ready-for-Ingest\SREDReels20210805\26368\data'
dfolder = r'C:\Users\myname\Downloads\practice'
for filename in os.listdir(ufolder):
    if (filename.endswith(".wav")): #or .avi, .mpeg, whatever.
        filepathO = str(ufolder)+"\\"+str(filename)
        filepathN = str(dfolder)+"\\"+"CLIPPED"+str(filename)
        os.system("ffmpeg -ss 0 -t 10 -i {0} {1}".format(filepathO, filepathN))
    else:
        continue


  


• MoviePy error : failed to read the first frame of video file ****. That might mean that the file is corrupted

  14 juillet 2022, par Udit Hari Vashisht

  I am trying to reverse a video using MoviePy. My code is as under : -

  


  from moviepy.editor import VideoFileClip
from moviepy.video.fx.all import time_mirror

clip = VideoFileClip("udit.mp4")

clip = clip.fx(time_mirror)

clip.write_videofile("reversed.mp4")


  


  But, when I run it I get the following error :-

  


  Traceback (most recent call last):&#xA;  File "/Users/uditvashisht/projects/experiments/script.py", line 6, in <module>&#xA;    clip = clip.fx(time_mirror)&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/Clip.py", line 212, in fx&#xA;    return func(self, *args, **kwargs)&#xA;  File "", line 2, in time_mirror&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/decorators.py", line 54, in requires_duration&#xA;    return f(clip, *a, **k)&#xA;  File "", line 2, in time_mirror&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/decorators.py", line 29, in apply_to_mask&#xA;    newclip = f(clip, *a, **k)&#xA;  File "", line 2, in time_mirror&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/decorators.py", line 41, in apply_to_audio&#xA;    newclip = f(clip, *a, **k)&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/video/fx/time_mirror.py", line 13, in time_mirror&#xA;    return self.fl_time(lambda t: self.duration - t, keep_duration=True)&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/Clip.py", line 187, in fl_time&#xA;    return self.fl(lambda gf, t: gf(t_func(t)), apply_to,&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/Clip.py", line 136, in fl&#xA;    newclip = self.set_make_frame(lambda t: fun(self.get_frame, t))&#xA;  File "", line 2, in set_make_frame&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/decorators.py", line 14, in outplace&#xA;    f(newclip, *a, **k)&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/video/VideoClip.py", line 644, in set_make_frame&#xA;    self.size = self.get_frame(0).shape[:2][::-1]&#xA;  File "", line 2, in get_frame&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/decorators.py", line 89, in wrapper&#xA;    return f(*new_a, **new_kw)&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/Clip.py", line 93, in get_frame&#xA;    return self.make_frame(t)&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/Clip.py", line 136, in <lambda>&#xA;    newclip = self.set_make_frame(lambda t: fun(self.get_frame, t))&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/Clip.py", line 187, in <lambda>&#xA;    return self.fl(lambda gf, t: gf(t_func(t)), apply_to,&#xA;  File "", line 2, in get_frame&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/decorators.py", line 89, in wrapper&#xA;    return f(*new_a, **new_kw)&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/Clip.py", line 93, in get_frame&#xA;    return self.make_frame(t)&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/video/io/VideoFileClip.py", line 113, in <lambda>&#xA;    self.make_frame = lambda t: self.reader.get_frame(t)&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/video/io/ffmpeg_reader.py", line 184, in get_frame&#xA;    result = self.read_frame()&#xA;  File "/opt/homebrew/lib/python3.9/site-packages/moviepy/video/io/ffmpeg_reader.py", line 133, in read_frame&#xA;    raise IOError(("MoviePy error: failed to read the first frame of "&#xA;OSError: MoviePy error: failed to read the first frame of video file udit.mp4. That might mean that the file is corrupted. That may also mean that you are using a deprecated version of FFMPEG. On Ubuntu/Debian for instance the version in the repos is deprecated. Please update to a recent version from the website&#xA;</lambda></lambda></lambda></module>

  


  I have tried the code on both Mac and Windows PC. The other functionality of MoviePy works fine, but I am not able to reverse the video. Both of my systems have ImageMagick and FFMPEG installed.