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• ValueError : I/O operation on closed file when making animation

  3 juillet 2018, par user3851187

  I am using matplotlib and ffmpeg to do some animations. I usually code on a remote server because the code runs faster ; we are having some issues making animations on the remote server. Here is an example of code that works perfectly on my local mac but does not work remotely.

  import matplotlib as mpl
  
  mpl.use('agg')
  
  import matplotlib as mpl 
  
  from matplotlib import animation
  
  import pylab
  
  
  
  def init():
  
      pylab.plot(pylab.arange(10), [0]*10)
  
  
  
  def redraw(frame):
  
      pylab.plot(pylab.arange(10), pylab.arange(10) * frame)
  
  
  
  fig = pylab.figure()
  
  ani = animation.FuncAnimation(fig, redraw, frames=10, interval=1000, init_func=init)
  
  ani.save('animation.mp4')

  I get the animation I want on my local machine (macOS Sierra). When I run it on the remote host (Debian GNU/Linux 8 (jessie)), I get the following error message after 5 frames

  Traceback (most recent call last):
  
    File "animation.py", line 14, in <module>
  
      ani.save('animation.mp4')
  
    File "/usr/local/lib/python2.7/dist-packages/matplotlib/animation.py", line 1200, in save
  
      writer.grab_frame(**savefig_kwargs)
  
    File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__
  
      self.gen.throw(type, value, traceback)
  
    File "/usr/local/lib/python2.7/dist-packages/matplotlib/animation.py", line 241, in saving
  
      self.finish()
  
    File "/usr/local/lib/python2.7/dist-packages/matplotlib/animation.py", line 367, in finish
  
      self.cleanup()
  
    File "/usr/local/lib/python2.7/dist-packages/matplotlib/animation.py", line 405, in cleanup
  
      out, err = self._proc.communicate()
  
    File "/usr/local/lib/python2.7/dist-packages/subprocess32.py", line 724, in communicate
  
      stdout, stderr = self._communicate(input, endtime, timeout)
  
    File "/usr/local/lib/python2.7/dist-packages/subprocess32.py", line 1535, in _communicate
  
      orig_timeout)
  
    File "/usr/local/lib/python2.7/dist-packages/subprocess32.py", line 1591, in _communicate_with_poll
  
      register_and_append(self.stdout, select_POLLIN_POLLPRI)
  
    File "/usr/local/lib/python2.7/dist-packages/subprocess32.py", line 1570, in register_and_append
  
      poller.register(file_obj.fileno(), eventmask)
  
  ValueError: I/O operation on closed file
  
  </module>

  My local machine uses matplotlib version 2.0.0 ; the remote machine uses matplotlib version 2.2.2

  On my local machine I have ffmpeg version 3.2.4

  $ ffmpeg -version
  
  ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.4 --enable-shared - 
  
  -enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables 
  
  --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
  libavutil      55. 34.101 / 55. 34.101
  
  libavcodec     57. 64.101 / 57. 64.101
  
  libavformat    57. 56.101 / 57. 56.101
  
  libavdevice    57.  1.100 / 57.  1.100
  
  libavfilter     6. 65.100 /  6. 65.100
  
  libavresample   3.  1.  0 /  3.  1.  0
  
  libswscale      4.  2.100 /  4.  2.100
  
  libswresample   2.  3.100 /  2.  3.100
  
  libpostproc    54.  1.100 / 54.  1.100 

  On the remote host i have ffmpeg version 4.0.1

  ffmpeg -version
  
  ffmpeg version 4.0.1 Copyright (c) 2000-2018 the FFmpeg developers
  
  built with gcc 4.9.2 (Debian 4.9.2-10+deb8u1)
  
  configuration: --prefix=/usr/local
  
  libavutil      56. 14.100 / 56. 14.100
  
  libavcodec     58. 18.100 / 58. 18.100
  
  libavformat    58. 12.100 / 58. 12.100
  
  libavdevice    58.  3.100 / 58.  3.100
  
  libavfilter     7. 16.100 /  7. 16.100
  
  libswscale      5.  1.100 /  5.  1.100
  
  libswresample   3.  1.100 /  3.  1.100

  If I recall correctly I installed ffmpeg locally through homebrew ; I have the anaconda distribution of python. On the remote machine we have the default version of python that comes with Jessie ; I’m not sure how the sysadmin installed ffmpeg.

  I am by no means an expert on ffmpeg, but I have generally never had issues with making animations in matplotlib on my local machine and I would really like to be able to make videos more quickly on the remote machine. Any help would be appreciated !

  Edit
  On the remote machine, the animation works if I use avconv as the writer instead of ffmpeg. I installed avconv locally...which led me to get the same ffmpeg issues locally (probably due to updating shared dependencies). However, I uninstalled ffmpeg and reinstalled it with x264 codec enables Animations in ipython (jupyter) notebook - ValueError : I/O operation on closed file

• ffmpeg output to opencv

  28 juin 2018, par 徐立派

  I am currently writing a simple script to pipe the output of ffmpeg to opencv, but it keeps yelling me error.

  My entire command line is

  ffmpeg -flags output_corrupt -analyzeduration 32 -probesize 32 -i temp_file.h264 -updatefirst 1 -y -qscale:v 2 -vf scale="240 :-1" -f image2pipe - | python cap.py

  My code for the python script is below

  import sys
  
  import cv2 as cv
  
  import numpy as np
  
  
  
  
  
  while True:
  
      img = sys.stdin
  
      # print img
  
      # img = cv.imdecode(img, 1)
  
      if img is not None:
  
          cv.imshow("Video", img)
  
          cv.waitkey(1)
  
      else:
  
          print "No image"

  After I execute the command line, I got the following messages :

  ffmpeg version 3.4.2-2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7 (Ubuntu 7.3.0-16ubuntu2)
  
    configuration: --prefix=/usr --extra-version=2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  [h264 @ 0x557ea6b01a60] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  [h264 @ 0x557ea6b01a60] decoding for stream 0 failed
  
  Input #0, h264, from 'temp_file.h264':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: h264 (High), yuvj420p(pc, progressive), 1280x720, 29.97 tbr, 1200k tbn, 59.94 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> mpeg2video (native))
  
  Press [q] to stop, [?] for help
  
  [h264 @ 0x557ea6b22a60] error while decoding MB 54 2, bytestream -16
  
  [h264 @ 0x557ea6b22a60] top block unavailable for requested intra mode -1
  
  [h264 @ 0x557ea6b22a60] error while decoding MB 2 9, bytestream 6907
  
  [h264 @ 0x557ea6b22a60] concealing 1275 DC, 1275 AC, 1275 MV errors in P frame
  
  [h264 @ 0x557ea6b28740] top block unavailable for requested intra mode -1
  
  [h264 @ 0x557ea6b28740] error while decoding MB 27 0, bytestream 5564
  
  [h264 @ 0x557ea6b28740] deblocking filter parameters 7 13 out of range
  
  [h264 @ 0x557ea6b28740] decode_slice_header error
  
  [h264 @ 0x557ea6b28740] concealing 1440 DC, 1440 AC, 1440 MV errors in P frame
  
  [h264 @ 0x557ea6ba5be0] deblocking filter parameters 7 -14 out of range
  
  [h264 @ 0x557ea6ba5be0] decode_slice_header error
  
  [swscaler @ 0x557ea7159ba0] deprecated pixel format used, make sure you did set range correctly
  
  [mpeg2video @ 0x557ea6b2ecc0] too many threads/slices (10), reducing to 9
  
  [h264 @ 0x557ea6ba5be0] concealing 1387 DC, 1387 AC, 1387 MV errors in P frame
  
  Output #0, mpegts, to 'pipe:':
  
    Metadata:
  
      encoder         : Lavf57.83.100
  
      Stream #0:0: Video: mpeg2video (Main), yuv420p, 240x135, q=2-31, 200 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc57.107.100 mpeg2video
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  [h264 @ 0x557ea6bc1b60] deblocking filter parameters -7 0 out of range
  
  [h264 @ 0x557ea6bc1b60] decode_slice_header error
  
  [h264 @ 0x557ea6bc1b60] concealing 1413 DC, 1413 AC, 1413 MV errors in P frame
  
  [h264 @ 0x557ea6bddae0] top block unavailable for requested intra mode -1
  
  [h264 @ 0x557ea6bddae0] error while decoding MB 9 0, bytestream 6647
  
  [h264 @ 0x557ea6bddae0] concealing 1186 DC, 1186 AC, 1186 MV errors in P frame
  
  [h264 @ 0x557ea6bf9a60] top block unavailable for requested intra mode
  
  [h264 @ 0x557ea6bf9a60] error while decoding MB 16 9, bytestream 6182
  
  [h264 @ 0x557ea6bf9a60] top block unavailable for requested intra mode -1
  
  [h264 @ 0x557ea6bf9a60] error while decoding MB 6 18, bytestream 7043
  
  [h264 @ 0x557ea6bf9a60] concealing 1440 DC, 1440 AC, 1440 MV errors in P frame
  
  [h264 @ 0x557ea6c159e0] top block unavailable for requested intra mode -1
  
  [h264 @ 0x557ea6c159e0] error while decoding MB 12 9, bytestream 6863
  
  [h264 @ 0x557ea6c159e0] concealing 1342 DC, 1342 AC, 1342 MV errors in P frame
  
  [h264 @ 0x557ea6c31d40] top block unavailable for requested intra mode
  
  [h264 @ 0x557ea6c31d40] error while decoding MB 29 18, bytestream 6611
  
  [h264 @ 0x557ea6c31d40] concealing 1405 DC, 1405 AC, 1405 MV errors in P frame
  
  [h264 @ 0x557ea6c4e0a0] top block unavailable for requested intra mode
  
  [h264 @ 0x557ea6c4e0a0] error while decoding MB 25 9, bytestream 6051
  
  [h264 @ 0x557ea6c4e0a0] top block unavailable for requested intra mode -1
  
  [h264 @ 0x557ea6c4e0a0] error while decoding MB 70 18, bytestream 5088
  
  [h264 @ 0x557ea6c4e0a0] concealing 1419 DC, 1419 AC, 1419 MV errors in P frame
  
  [h264 @ 0x557ea6c6a400] top block unavailable for requested intra mode
  
  [h264 @ 0x557ea6c6a400] error while decoding MB 14 9, bytestream 6071
  
  [h264 @ 0x557ea6c6a400] deblocking filter parameters -9 0 out of range
  
  [h264 @ 0x557ea6c6a400] decode_slice_header error
  
  [h264 @ 0x557ea6c6a400] concealing 1440 DC, 1440 AC, 1440 MV errors in P frame
  
  [h264 @ 0x557ea6c86760] top block unavailable for requested intra mode -1
  
  [h264 @ 0x557ea6c86760] error while decoding MB 54 9, bytestream 4422
  
  [h264 @ 0x557ea6c86760] concealing 1256 DC, 1256 AC, 1256 MV errors in P frame
  
  [h264 @ 0x557ea6ca2ac0] top block unavailable for requested intra mode -1
  
  [h264 @ 0x557ea6ca2ac0] error while decoding MB 22 9, bytestream 5862
  
  [h264 @ 0x557ea6ca2ac0] concealing 1335 DC, 1335 AC, 1335 MV errors in P frame
  
  [h264 @ 0x557ea6b2f180] deblocking filter parameters 7 -4 out of range
  
  [h264 @ 0x557ea6b2f180] decode_slice_header error
  
  [h264 @ 0x557ea6b2f180] concealing 1430 DC, 1430 AC, 1430 MV errors in P frame
  
  Traceback (most recent call last):
  
    File "cap.py", line 11, in <module>
  
      cv.imshow("Video", img)
  
  TypeError: mat is not a numpy array, neither a scalar
  
  [h264 @ 0x557ea6b22a60] concealing 1319 DC, 1319 AC, 1319 MV errors in P frame
  
  [h264 @ 0x557ea6b28740] top block unavailable for requested intra mode -1
  
  [h264 @ 0x557ea6b28740] error while decoding MB 16 9, bytestream 6218
  
  [h264 @ 0x557ea6b28740] concealing 1416 DC, 1416 AC, 1416 MV errors in P frame
  
  [h264 @ 0x557ea6ba5be0] top block unavailable for requested intra mode -1
  
  [h264 @ 0x557ea6ba5be0] error while decoding MB 12 0, bytestream 6854
  
  [h264 @ 0x557ea6ba5be0] top block unavailable for requested intra mode -1
  
  [h264 @ 0x557ea6ba5be0] error while decoding MB 2 9, bytestream 7092
  
  </module>

  It seems that opencv doesn’t recognize the image that I pipe to it with

  Traceback (most recent call last):
  
    File "cap.py", line 11, in <module>
  
      cv.imshow("Video", img)
  
  TypeError: mat is not a numpy array, neither a scalar
  
  </module>

  Anyone know where the problem is ? Any help is appreciated, thanks in advance.

• ffmpeg command with action subprocess

  1er juillet 2018, par MathJunkiey

  I want to run this command in a python script

  cmd = 'ffmpeg -ss ' + start_time + ' -i remove_takeoff.mp4 -filter_complex "[0]trim=0,setpts=PTS-STARTPTS[b];[b][0]overlay=shortest=1" -shortest -c:a trimmed_takeoff.mp4'

  I’m using the following code snippet

  import subprocess
  
  import shlex
  
  
  
  cmd = # the command
  
  suprocess.call(shlex.split(cmd))

  I’m getting the following error

  Trailing options were found on the commandline.

  The above error occurring because the shlex.split command is converting the double quotes of the part into single quote. How to avoid this from happening. Can anyone suggest me a solutions for this problem.

  Check the full error trace below.

  ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 4.8.2 (GCC) 20140120 (Red Hat 4.8.2-15)
  
    configuration: --prefix=/home/vkv/anaconda3 
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Trailing options were found on the commandline.
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'remove_takeoff.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.67.100
  
    Duration: 00:00:14.00, start: 0.000000, bitrate: 15883 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 15881 kb/s, 20 fps, 20 tbr, 10240 tbn, 40 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Filter overlay has an unconnected output