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• Moviepy : subclip fails when iterating through CSV

  5 mai 2016, par user3316291

  I am trying to randomize the order of video clips based on timing from a CSV file and then reassemble the randomized clips into a single video. However, I am receiving an error in the loop that iterates through each clip timing to create the subclip.

  Here is what my CSV looks like :

  00:00:32.18,00:00:52.10,1
  
  00:00:52.11,00:00:56.09,2
  
  00:00:56.10,00:00:58.15,3
  
  00:00:58.16,00:01:05.16,4
  
  00:01:05.17,00:01:16.04,5

  column 1 is clip onset
  column 2 is clip offset
  column 3 is scene number that I use to randomize

  Here is my code :

  import os
  
  import csv
  
  import numpy as np
  
  from moviepy.editor import *
  
  
  
  f = open('SceneCuts.csv')
  
  csv_f = csv.reader(f)
  
  
  
  scenes = []
  
  ons = []
  
  offs = []
  
  for row in csv_f:
  
      ons.append(row[0])
  
      offs.append(row[1])
  
      scenes.append(row[2])
  
  
  
  r_scene = scenes
  
  np.random.seed(1000)
  
  np.random.shuffle(r_scene)
  
  r_scene = map(int, r_scene)
  
  
  
  clip = VideoFileClip("FullVideo.m4v")
  
  
  
  temp = []
  
  for row in r_scene:
  
      print(row)
  
      temp.append(clip.subclip(ons[row-1], offs[row-1]))
  
  
  
  catclip = concatenate_videoclips(temp)
  
  catclip_resize = catclip.resize((1024,576))
  
  catclip_resize.write_videofile("RandomVideo.mp4")

  Here is the output, error occurs at line 29 (temp.append)

  File "/Users/Dustin/anaconda/lib/python2.7/site-packages/moviepy/video/io/ffmpeg_reader.py", line 87, in initialize
  
  self.proc = sp.Popen(cmd, **popen_params)
  
  
  
  File "/Users/Dustin/anaconda/lib/python2.7/subprocess.py", line 710, in __init__
  
  errread, errwrite)
  
  
  
  File "/Users/Dustin/anaconda/lib/python2.7/subprocess.py", line 1316, in _execute_child
  
  data = _eintr_retry_call(os.read, errpipe_read, 1048576)
  
  
  
  File "/Users/Dustin/anaconda/lib/python2.7/subprocess.py", line 476, in _eintr_retry_call
  
  return func(*args)
  
  
  
  OSError: [Errno 22] Invalid argument

  Based on my research, it appears to be something regarding child processes and subprocess.Popen, but I can’t figure it out. Thanks !

  EDIT to add new information :
  I have been running the above script in Spyder (anaconda) and receiving the above errors. However, when I run from a terminal or sublime (cmd+b), the code "works". It runs and I do not get the above error, however, the resulting video file is a mess. There are multiple conflicting audio tracks that shouldn’t be there. I am not sure what is going on in Spyder, but I’d love to know. Also, I still need to fix the audio problem.

• ffmper with vlc - too heavy screen grabbing, resulting injumpy file, frame loss

  15 mai 2016, par OGP

  I’m using ’vlc/ffmpeg’ package to grab the screen and convert it to H.264 file.

  The problem arises when the host is heavily loaded. I need to maintain correct time stamps and use the 5 fps (relatively low frame rate). Yet sometimes the resulting file jumps few seconds forward, apparently due to frame loss.
  I can deal with the frame loss, it’s OK, but I need to duplicate lost frames to maintain correct timing.

  My configuration file :

  vlc.exe screen :// -I dummy —verbose=2 —one-instance :screen-fps=5 :screen-caching=10000 :sout=#transcodevenc=x264preset=ultrafast,tune=zerolatency,vcodec=h264,fps=5,vb=3000,width=1024,height=576,acodec=none:filedst="C :\tmp\output.mp4"

  What should I add/config to preserve proper time stamps and clip duration ?

  Many thanks for your help.

• avfilter/f_metadata : add pts_time to print output

  9 mai 2016, par Tobias Rapp

  avfilter/f_metadata : add pts_time to print output
  This allows e.g. to correlate signalstats metadata to time position
  
  without having to find out the filter chain timebase first.
  Signed-off-by : Tobias Rapp <t.rapp@noa-archive.com>
  
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavfilter/f_metadata.c