Recherche avancée

Sur d’autres sites (5849)

• Availability of WebM (VP8) Video Hardware IP Designs

  10 janvier 2011, par noreply@blogger.com (John Luther)

  Hello from the frigid city of Oulu, in the far north of Finland. Our WebM hardware development team, formerly part of On2 Technologies, is now up-to-speed and working hard on a number of video efforts for WebM.
  

  • VP8 (the video codec used in WebM) hardware decoder IP is available from Google for semiconductor companies who want to support high-quality WebM playback in their chipsets.
  • The Oulu team will release the first VP8 video hardware encoder IP in the first quarter of 2011. We have the IP running in an FPGA environment, and rigorous testing is underway. Once all features have been tested and implemented, the encoder will be launched as well.

  WebM video hardware IPs are implemented and delivered as RTL (VHDL/Verilog) source code, which is a register-level hardware description language for creating digital circuit designs. The code is based on the Hantro brand video IP from On2, which has been successfully deployed by numerous chipset companies around the world. Our designs support VP8 up to 1080p resolution and can run 30 or 60fps, depending on the foundry process and hardware clock frequency.

  The WebM/VP8 hardware decoder implementation has already been licensed to over twenty partners and is proven in silicon. We expect the first commercial chips to integrate our VP8 decoder IP to be available in the first quarter of 2011. For example, Chinese semiconductor maker Rockchip last week demonstrated full WebM hardware playback on their new RK29xx series processor at CES in Las Vegas (video below).
  

  
  Note : To view the video in WebM format, ensure that you’ve enrolled in the YouTube HTML5 trial and are using a WebM-compatible browser. You can also view the video on YouTube.

  Hardware implementations of the VP8 encoder also bring exciting possibilities for WebM in portable devices. Not only can hardware-accelerated devices play high-quality WebM content, but hardware encoding also enables high-resolution, real-time video communications apps on the same devices. For example, when VP8 video encoding is fully off-loaded to a hardware accelerator, you can run 720p or even 1080p video conferencing at full framerate on a portable device with minimal battery use.

  The WebM hardware video IP team will be focusing on further developing the VP8 hardware designs while also helping our semiconductor partners to implement WebM video compression in their chipsets. If you have any questions, please visit our Hardware page.

  Happy New Year to the WebM community !

  Jani Huoponen, Product Manager
  Aki Kuusela, Engineering Manager

  

• Change AVI creation date with ffmpeg ?

  1er novembre 2016, par brock

  As far as I can tell the following ffmpeg command should copy all existing metadata in the input file to the output file and modify the specified field in the output file :

  ffmpeg -i VID_20130502_220104.avi -metadata creation_time="2013-05-02 22:01:04" -codec copy VID_20130502_220104-2.avi

  Instead, it seems to strip all metadata from the output file. Here is the output of a few commands. I am going nuts. I think this should work, but why is it not ?

  Command to edit the creation time :

  ffmpeg -i VID_20130502_220104.avi -metadata creation_time="2013-05-02 22:01:04" -codec copy VID_20130502_220104-2.avi
  
  
  
  ffmpeg version 3.1.5 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 41.100 / 57. 41.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 47.100 /  6. 47.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Guessed Channel Layout for Input Stream #0.1 : mono
  
  Input #0, avi, from 'VID_20130502_220104.avi':
  
    Metadata:
  
      encoder         : 
  
      maker           : NIKON
  
      model           : COOLPIX S4300
  
      creation_time   : 2011-01-01 00:00:00
  
    Duration: 00:01:30.50, start: 0.000000, bitrate: 32135 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 31782 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, 1 channels, s16, 352 kb/s
  
  [avi @ 000000000032ad40] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
      Last message repeated 1 times
  
  Output #0, avi, to 'VID_20130502_220104-2.avi':
  
    Metadata:
  
      creation_time   : 2013-05-02 22:01:04
  
      maker           : NIKON
  
      model           : COOLPIX S4300
  
      ISFT            : Lavf57.41.100
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, q=2-31, 31782 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono, 352 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  891 fps=0.0 q=-1.0 size=  116171kB time=00:00:29.69 bitrate=32043.1kbits/s speed=59.4x    
  
  frame= 1739 fps=1739 q=-1.0 size=  227191kB time=00:00:57.96 bitrate=32107.5kbits/s speed=  58x    
  
  frame= 2609 fps=1739 q=-1.0 size=  340940kB time=00:01:26.96 bitrate=32115.9kbits/s speed=  58x    
  
  frame= 2715 fps=1734 q=-1.0 Lsize=  355018kB time=00:01:30.49 bitrate=32136.3kbits/s speed=57.8x    
  
  video:350984kB audio:3897kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.038597%

  Command to inspect the output file metadata with ffmpeg :

  ffmpeg -i VID_20130502_220104-2.avi
  
  
  
  ffmpeg version 3.1.5 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 41.100 / 57. 41.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 47.100 /  6. 47.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Guessed Channel Layout for Input Stream #0.1 : mono
  
  Input #0, avi, from 'VID_20130502_220104-2.avi':
  
    Metadata:
  
      encoder         : Lavf57.41.100
  
    Duration: 00:01:30.50, start: 0.000000, bitrate: 32136 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 31782 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, 1 channels, s16, 352 kb/s
  
  At least one output file must be specified

  Command to inspect the input file metadata with exiftool :

  exiftool.exe VID_20130502_220104.avi
  
  
  
  ExifTool Version Number         : 10.30
  
  File Name                       : VID_20130502_220104.avi
  
  Directory                       : .
  
  File Size                       : 347 MB
  
  File Modification Date/Time     : 2013:05:13 16:33:52-04:00
  
  File Access Date/Time           : 2015:11:10 23:08:25-05:00
  
  File Creation Date/Time         : 2015:11:10 23:08:25-05:00
  
  File Permissions                : rw-rw-rw-
  
  File Type                       : AVI
  
  File Type Extension             : avi
  
  MIME Type                       : video/x-msvideo
  
  Frame Rate                      : 30
  
  Max Data Rate                   : 488.3 kB/s
  
  Frame Count                     : 2715
  
  Stream Count                    : 2
  
  Stream Type                     : Video
  
  Video Codec                     : mjpg
  
  Video Frame Rate                : 30
  
  Video Frame Count               : 2715
  
  Quality                         : 10000
  
  Sample Size                     : Variable
  
  Image Width                     : 1280
  
  Image Height                    : 720
  
  Planes                          : 1
  
  Bit Depth                       : 24
  
  Compression                     : MJPG
  
  Image Length                    : 2764800
  
  Pixels Per Meter X              : 0
  
  Pixels Per Meter Y              : 0
  
  Num Colors                      : Use BitDepth
  
  Num Important Colors            : All
  
  Audio Codec                     : 
  
  Audio Sample Rate               : 22050
  
  Audio Sample Count              : 1995256
  
  Encoding                        : Microsoft PCM
  
  Num Channels                    : 1
  
  Sample Rate                     : 22050
  
  Avg Bytes Per Sec               : 44100
  
  Bits Per Sample                 : 16
  
  Maker Note Type                 : NIKON
  
  Maker Note Version              : 0.1.0.0
  
  Make                            : NIKON
  
  Model                           : COOLPIX S4300
  
  Software                        : V1.0
  
  Equipment                       : NIKON DIGITAL CAMERA
  
  Orientation                     : Horizontal (normal)
  
  Exposure Time                   : 1/15
  
  F Number                        : 3.5
  
  Exposure Compensation           : 0
  
  Max Aperture Value              : 3.2
  
  Metering Mode                   : Multi-segment
  
  Focal Length                    : 4.6 mm
  
  X Resolution                    : 72
  
  Y Resolution                    : 72
  
  Resolution Unit                 : inches
  
  Date/Time Original              : 2011:01:01 00:00:00
  
  Create Date                     : 2011:01:01 00:00:00
  
  Focus Mode                      : AF-S
  
  Digital Zoom                    : 1
  
  Color Mode                      : COLOR
  
  Sharpness                       : AUTO
  
  White Balance                   : NORMAL
  
  Noise Reduction                 : OFF
  
  Thumbnail Image                 : (Binary data 3082 bytes, use -b option to extract)
  
  Aperture                        : 3.5
  
  Duration                        : 0:01:30
  
  Image Size                      : 1280x720
  
  Megapixels                      : 0.922
  
  Shutter Speed                   : 1/15
  
  Focal Length                    : 4.6 mm

  Command to inspect the output file metadata with exiftool :

  exiftool.exe VID_20130502_220104-2.avi
  
  
  
  ExifTool Version Number         : 10.30
  
  File Name                       : VID_20130502_220104-2.avi
  
  Directory                       : .
  
  File Size                       : 347 MB
  
  File Modification Date/Time     : 2016:11:01 00:17:38-04:00
  
  File Access Date/Time           : 2016:11:01 00:17:36-04:00
  
  File Creation Date/Time         : 2016:11:01 00:15:18-04:00
  
  File Permissions                : rw-rw-rw-
  
  File Type                       : AVI
  
  File Type Extension             : avi
  
  MIME Type                       : video/x-msvideo
  
  Frame Rate                      : 30
  
  Max Data Rate                   : 3923 kB/s
  
  Frame Count                     : 2715
  
  Stream Count                    : 2
  
  Stream Type                     : Video
  
  Video Codec                     : MJPG
  
  Video Frame Rate                : 30
  
  Video Frame Count               : 2715
  
  Quality                         : Default
  
  Sample Size                     : Variable
  
  Image Width                     : 1280
  
  Image Height                    : 720
  
  Planes                          : 1
  
  Bit Depth                       : 24
  
  Compression                     : MJPG
  
  Image Length                    : 2764800
  
  Pixels Per Meter X              : 0
  
  Pixels Per Meter Y              : 0
  
  Num Colors                      : Use BitDepth
  
  Num Important Colors            : All
  
  Audio Codec                     : .
  
  Audio Sample Rate               : 22050
  
  Audio Sample Count              : 1995256
  
  Encoding                        : Microsoft PCM
  
  Num Channels                    : 1
  
  Sample Rate                     : 22050
  
  Avg Bytes Per Sec               : 44100
  
  Bits Per Sample                 : 16
  
  Software                        : Lavf57.41.100
  
  Duration                        : 0:01:30
  
  Image Size                      : 1280x720
  
  Megapixels                      : 0.922

• How to obtain time markers for video splitting using python/OpenCV

  30 mars 2016, par Bleddyn Raw-Rees

  Hi I’m new to the world of programming and computer vision so please bare with me.

  I’m working on my MSc project which is researching automated deletion of low value content in digital file stores. I’m specifically looking at the sort of long shots that often occur in natural history filming whereby a static camera is left rolling in order to capture the rare snow leopard or whatever. These shots may only have some 60s of useful content with perhaps several hours of worthless content either side.

  As a first step I have a simple motion detection program from Adrian Rosebrock’s tutorial [http://www.pyimagesearch.com/2015/05/25/basic-motion-detection-and-tracking-with-python-and-opencv/#comment-393376]. Next I intend to use FFMPEG to split the video.

  What I would like help with is how to get in and out points based on the first and last points that motion is detected in the video.

  Here is the code should you wish to see it...

  # import the necessary packages
  
  import argparse
  
  import datetime
  
  import imutils
  
  import time
  
  import cv2
  
  
  
  # construct the argument parser and parse the arguments
  
  ap = argparse.ArgumentParser()
  
  ap.add_argument("-v", "--video", help="path to the video file")
  
  ap.add_argument("-a", "--min-area", type=int, default=500, help="minimum area size")
  
  args = vars(ap.parse_args())
  
  
  
  # if the video argument is None, then we are reading from webcam
  
  if args.get("video", None) is None:
  
  camera = cv2.VideoCapture(0)
  
  time.sleep(0.25)
  
  
  
  # otherwise, we are reading from a video file
  
  else:
  
      camera = cv2.VideoCapture(args["video"])
  
  
  
  # initialize the first frame in the video stream
  
  firstFrame = None
  
  
  
  # loop over the frames of the video
  
  while True:
  
      # grab the current frame and initialize the occupied/unoccupied
  
      # text
  
      (grabbed, frame) = camera.read()
  
      text = "Unoccupied"
  
  
  
      # if the frame could not be grabbed, then we have reached the end
  
      # of the video
  
      if not grabbed:
  
          break
  
  
  
      # resize the frame, convert it to grayscale, and blur it
  
      frame = imutils.resize(frame, width=500)
  
      gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
  
      gray = cv2.GaussianBlur(gray, (21, 21), 0)
  
  
  
      # if the first frame is None, initialize it
  
      if firstFrame is None:
  
          firstFrame = gray
  
          continue
  
  
  
      # compute the absolute difference between the current frame and
  
      # first frame
  
      frameDelta = cv2.absdiff(firstFrame, gray)
  
      thresh = cv2.threshold(frameDelta, 25, 255, cv2.THRESH_BINARY)[1]
  
  
  
      # dilate the thresholded image to fill in holes, then find contours
  
      # on thresholded image
  
      thresh = cv2.dilate(thresh, None, iterations=2)
  
      (_, cnts, _) = cv2.findContours(thresh.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
  
  
  
      # loop over the contours
  
      for c in cnts:
  
          # if the contour is too small, ignore it
  
          if cv2.contourArea(c) < args["min_area"]:
  
              continue
  
  
  
          # compute the bounding box for the contour, draw it on the frame,
  
          # and update the text
  
          (x, y, w, h) = cv2.boundingRect(c)
  
          cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)
  
          text = "Occupied"
  
  
  
      # draw the text and timestamp on the frame
  
      cv2.putText(frame, "Room Status: {}".format(text), (10, 20),
  
          cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 255), 2)
  
      cv2.putText(frame, datetime.datetime.now().strftime("%A %d %B %Y %I:%M:%S%p"),
  
          (10, frame.shape[0] - 10), cv2.FONT_HERSHEY_SIMPLEX, 0.35, (0, 0, 255), 1)
  
  
  
      # show the frame and record if the user presses a key
  
      cv2.imshow("Security Feed", frame)
  
      cv2.imshow("Thresh", thresh)
  
      cv2.imshow("Frame Delta", frameDelta)
  
      key = cv2.waitKey(1) & 0xFF
  
  
  
      # if the `q` key is pressed, break from the lop
  
      if key == ord("q"):
  
          break
  
  
  
  # cleanup the camera and close any open windows
  
  camera.release()
  
  cv2.destroyAllWindows()

  Thanks !