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• Running a py script in the Cloud

  12 janvier 2018, par Anay Bose

  I’m new to Google’s cloud & Virtual Machine(VM) instances, and I need some clarifications on a couple of points. I have a python script ; it imports a long range of functions. I need to run those functions in parallel. I’m using multiprocessing and Process, not threads. These functions are basically image and media processors, and they use many other tools like FFMPEG, imagemagick and Avisynth in addition to a wide range of python modules, including moviepy. Now, I would like to run some 50 functions in parallel assigning a CPU for each process. Images, media and avi files are stored in seperate folders. I’m on Windows7 Core-i7 machine. So, need cloud computing power.

  Now, my question can I run such a python script/app in the cloud that requires a very complicated file system and non-python tools i.e. ffmpeg, avisynth and avi files ?

  Can Google VMs emulate my local machine and empower me with more cores and memory to run such a program ? if not, then what are my options ? Is their any tutorials that I can follow ? I need your suggestions. I have given below an example script and some codes to help facilitate your understanding about my situation.

  from __future__ import unicode_literals
  
  import youtube_dl
  
  import os
  
  import time
  
  import sys
  
  reload(sys)  
  
  sys.setdefaultencoding('utf-8')
  
  from multiprocessing import Process
  
  from utils import *
  
  
  
  from clip31 import VIDEO31
  
  from clip32 import VIDEO32
  
  from clip189 import VIDEO189
  
  from clip16 import VIDEO16
  
  from clip39 import VIDEO39
  
  
  
  
  
  if __name__== '__main__':
  
  
  
      # 1. CALLING A FUNCTION
  
      folder = "bodyforce3\\16"
  
      serial = "16"
  
      images = get_filepaths("../16")
  
      videos = get_filepaths("12__media")
  
      pngs = get_filepaths("../pngs")
  
  
  
      Process(target=VIDEO192, args=(folder, serial, color1, color2, color3, images, videos)).start()
  
  
  
  
  
      # 2. CALLING A FUNCTION
  
      folder = "bodyforce3\\20"
  
      serial = "20"
  
      images = get_filepaths("../20")
  
      videos = get_filepaths("18__media")
  
  
  
      Process(target=VIDEO32, args=(folder, serial, color1, color2, color3, images, videos)).start()
  
  
  
  
  
      # 3. CALLING A FUNCTION
  
      folder = "bodyforce3\\14"
  
      serial = "14"
  
      images = get_filepaths("../14")
  
      videos = get_filepaths("16__media")
  
  
  
      Process(target=VIDEO91, args=(folder, serial, color1, color2, color3, images, videos)).start()

  I copy avi files in functions like this :

  src = "clip50_files"
  
  src_files = os.listdir(src)
  
  for file_name in src_files:
  
      full_file_name = os.path.join(src, file_name)
  
      if (os.path.isfile(full_file_name)):
  
          shutil.copy(full_file_name, folder)

  I call ffmpeg commands like this, and they are included within py functions.

  ###########################
  
  #### FFMPEG OPERATIONS ####
  
  ###########################
  
  
  
  print "Starting FFMPEG operations ..."
  
  
  
  if os.path.isfile(os.path.join(folder, "bounce-(3).avi")):
  
      os.remove(os.path.join(folder, "bounce-(3).avi"))
  
  
  
  
  
  infile = folder + "/bounce-(3).avs"
  
  outfile = folder + "/bounce-(3).avi"
  
  codec = "rawvideo"
  
  pix_fmt = "bgra"
  
  
  
  try:
  
      subprocess.call(["ffmpeg",
  
                       "-i" ,infile, 
  
                       "-c:v" ,codec, 
  
                       "-pix_fmt", pix_fmt, 
  
                       outfile],
  
                      stdout=open(os.devnull, 'w'), 
  
                      stderr=subprocess.STDOUT)
  
  except subprocess.CalledProcessError as e:   
  
      #except subprocess.CalledProcessError as e:
  
      sys.exit(e.output)
  
  except OSError as e:
  
      sys.exit(e.strerror)
  
  
  
  
  
  print "FFMPEG operations ended"

• FFMpeg access AVFoundation usb subdevice camera on OSX Mojave

  20 août 2020, par Retiarius

  I Have a dual USB camera for VR : two cameras, one usb connection. On linux, this appears in /dev/video0 and /dev/video1 and I can capture using ffmpeg -i /dev/video0

  



  On Mojave, I can see both devices in the USB hub :

  



  USB 2.0 Hub:

Product ID: 0x0101
Vendor ID:  0x1a40  (TERMINUS TECHNOLOGY INC.)
Version:    1.11
Speed:  Up to 480Mb/sec
Location ID:    0x14200000 / 8
Current Available (mA): 500
Current Required (mA):  100
Extra Operating Current (mA):   0

    Stereo Vision 2:

    Product ID: 0x9901
    Vendor ID:  0x0ac8  (Z-Star Microelectronics Corporation)
    Version:    27.02
    Serial Number:  SN0099
    Speed:  Up to 480Mb/sec
    Manufacturer:   SHENZHEN RERVISION TECHNOLOGY
    Location ID:    0x14220000 / 10
    Current Available (mA): 500
    Current Required (mA):  500
    Extra Operating Current (mA):   0

    Stereo Vision 2:

    Product ID: 0x9902
    Vendor ID:  0x0ac8  (Z-Star Microelectronics Corporation)
    Version:    27.02
    Serial Number:  SN0100
    Speed:  Up to 480Mb/sec
    Manufacturer:   SHENZHEN RERVISION TECHNOLOGY
    Location ID:    0x14210000 / 9
    Current Available (mA): 500
    Current Required (mA):  500
    Extra Operating Current (mA):   0


  



  But when I list devices, I can see only one [0] :

  



  ffmpeg -f avfoundation -list_devices true -i ""
    [AVFoundation input device @ 0x7fae5b501a80] AVFoundation video devices:
    [AVFoundation input device @ 0x7fae5b501a80] [0] Stereo Vision 2
    [AVFoundation input device @ 0x7fae5b501a80] [1] FaceTime HD Camera
    [AVFoundation input device @ 0x7fae5b501a80] [2] Capture screen 0


  



  capturing from this device captures from one of the cameras.

  



  How can I get ffmpeg to detect the second usb device as well ?

  


• Start of video is not labeled as "0" in QuickTime Video from GoPro

  26 mars 2020, par John Terragnoli

  I’m trying to combine four GoPro videos into a single video, and then rotate it 90 degrees. However, the time scales on the bottom of the videos are all wrong. The videos are 17 minutes and 42 second. But the beginning time is labeled as 5:15:20:32 and the ending time is 5:33:01:32. It just looks really weird and I’d like to fix it. After I use ffmpeg to rotate and concatenate the videos, the problem persists. Could it possibly be fixed with Exiftool ?

  ffmpeg -safe 0 -f concat -i list.txt -vcodec copy -acodec copy merged_videos.MP4

  ffmpeg -i input.mov -vf "transpose=1" output.mov

  Here is the exiftool information on one of the videos :

  File Name                       : GOPR3023.MP4
  
  Directory                       : .
  
  File Size                       : 3.7 GB
  
  File Modification Date/Time     : 2018:04:12 14:56:16-05:00
  
  File Access Date/Time           : 2020:03:25 12:17:18-05:00
  
  File Inode Change Date/Time     : 2020:03:25 17:57:04-05:00
  
  File Permissions                : rwxrwxrwx
  
  File Type                       : MP4
  
  File Type Extension             : mp4
  
  MIME Type                       : video/mp4
  
  Major Brand                     : MP4 v1 [ISO 14496-1:ch13]
  
  Minor Version                   : 2013.10.18
  
  Compatible Brands               : mp41
  
  Movie Data Size                 : 4001979951
  
  Movie Data Offset               : 28
  
  Movie Header Version            : 0
  
  Create Date                     : 2018:04:12 14:38:32
  
  Modify Date                     : 2018:04:12 14:38:32
  
  Time Scale                      : 60000
  
  Duration                        : 0:17:42
  
  Preferred Rate                  : 1
  
  Preferred Volume                : 100.00%
  
  Preview Time                    : 0 s
  
  Preview Duration                : 0 s
  
  Poster Time                     : 0 s
  
  Selection Time                  : 0 s
  
  Selection Duration              : 0 s
  
  Current Time                    : 0 s
  
  Next Track ID                   : 6
  
  Firmware Version                : HD5.03.02.51.00
  
  Lens Serial Number              : NAH6092300301117
  
  Camera Serial Number Hash       : 34676f2cdf49b86a1514817a93377bf7
  
  Track Header Version            : 0
  
  Track Create Date               : 2018:04:12 14:38:32
  
  Track Modify Date               : 2018:04:12 14:38:32
  
  Track ID                        : 1
  
  Track Duration                  : 0:17:42
  
  Track Layer                     : 0
  
  Track Volume                    : 0.00%
  
  Image Width                     : 1920
  
  Image Height                    : 1080
  
  Graphics Mode                   : srcCopy
  
  Op Color                        : 0 0 0
  
  Compressor ID                   : avc1
  
  Source Image Width              : 1920
  
  Source Image Height             : 1080
  
  X Resolution                    : 72
  
  Y Resolution                    : 72
  
  Compressor Name                 : GoPro AVC encoder
  
  Bit Depth                       : 24
  
  Color Representation            : nclx 1 1 1
  
  Video Frame Rate                : 59.94
  
  Time Code                       : 3
  
  Balance                         : 0
  
  Audio Format                    : mp4a
  
  Audio Channels                  : 2
  
  Audio Bits Per Sample           : 16
  
  Audio Sample Rate               : 48000
  
  Text Font                       : Unknown (21)
  
  Text Face                       : Plain
  
  Text Size                       : 10
  
  Text Color                      : 0 0 0
  
  Background Color                : 65535 65535 65535
  
  Font Name                       : Helvetica
  
  Other Format                    : tmcd
  
  Warning                         : [minor] The ExtractEmbedded option may find more tags in the movie data
  
  Matrix Structure                : 1 0 0 0 1 0 0 0 1
  
  Media Header Version            : 0
  
  Media Create Date               : 2018:04:12 14:38:32
  
  Media Modify Date               : 2018:04:12 14:38:32
  
  Media Time Scale                : 60000
  
  Media Duration                  : 0:17:42
  
  Handler Class                   : Media Handler
  
  Handler Type                    : NRT Metadata
  
  Handler Description             : GoPro SOS
  
  Gen Media Version               : 0
  
  Gen Flags                       : 0 0 0
  
  Gen Graphics Mode               : srcCopy
  
  Gen Op Color                    : 0 0 0
  
  Gen Balance                     : 0
  
  Meta Format                     : fdsc
  
  Image Size                      : 1920x1080
  
  Megapixels                      : 2.1
  
  Avg Bitrate                     : 30.1 Mbps
  
  Rotation                        : 0

  Part 2
  There is a pretty obvious "stutter" at the 17:42 mark where the two clips are combined. I’ve tried using ffmpeg and iMovie, but both give the same results. The GoPro broke up the event into multiple clips on it’s own so it seems weird that there would be any information missing. Is there any way to get rid of this stutter ?

  Thanks !