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• How to extract Images from MP4 video on upload - FFMPEG

  11 février 2015, par michael hanon

  I am putting together a training site for my company and we need to extract an image from each mp4 video we upload. I have searched lots and decided to try FFMPEG.

  Here is what I have so far. I’m not getting errors, but no image in the specified folder.

  Any help would be appreciated.

             string inputfile = Server.MapPath("/Report/TrainingLibrary/Material/Videos/RMSIMAILSignature.mp4");
           //string withouttext;
           string thumbpath;
           string thumbname;
           string thumbargs;
           //string thumbre;
          thumbpath = AppDomain.CurrentDomain.BaseDirectory + "Reports\\ TrainingLibrary\\Material\\Videos\\";
           thumbname = thumbpath + "Image" + "%d" + ".jpg";
           thumbargs = "-i " + inputfile + " -vframes 1 -ss 00:00:07 -s 150x150 " + thumbname;
           Process thumbproc = new Process();
           thumbproc = new Process();
           thumbproc.StartInfo.FileName = "C:\\FFMPEG\\Bin\\ffmpeg.exe";
           thumbproc.StartInfo.Arguments = thumbargs;
           thumbproc.StartInfo.UseShellExecute = false;
           thumbproc.StartInfo.CreateNoWindow = false;
           thumbproc.StartInfo.RedirectStandardOutput = false;
           try
           {
               thumbproc.Start();
           }
           catch (Exception ex)
           {
               Response.Write(ex.Message);
           }
           thumbproc.WaitForExit();
           thumbproc.Close();

• FFMpeg Command work in command line, but not in python script

  20 février 2015, par Fooldj

  Okay, kind of a weird problem. But I’m not sure whether it’s python, ffmpeg, or some stupid thing I’m doing wrong.

  I’m trying to take a video, and take 1 frame a second, and output that frame to an image. Right now, if i use the command line with ffmpeg :

  ffmpeg -i test.avi -r 1 -f image2 image-%3d.jpeg -pix_fmt rgb24 -vcodec rawrvideo

  It outputs about 10 images, the images look fine, awesome. Now I have this code (right now some code from some github, as I wanted stuff that i was relatively sure would work, and mine is allll convoluted)

  import subprocess as sp
  
  import numpy as np
  
  import re
  
  import cv2
  
  import time
  
  
  
  FFMPEG_BIN = r'ffmpeg.exe'
  
  INPUT_VID = 'test.avi'
  
  
  
  def getInfo():
  
      command = [FFMPEG_BIN,'-i', INPUT_VID, '-']
  
      pipe = sp.Popen(command, stdout=sp.PIPE, stderr=sp.PIPE)
  
      pipe.stdout.readline()
  
      pipe.terminate()
  
      infos = pipe.stderr.read()
  
      infos_list = infos.split('\r\n')
  
      res = re.search(' \d+x\d+ ',infos)
  
      res = [int(x) for x in res.group(0).split('x')]
  
      return res
  
  res = getInfo()
  
  command = [ FFMPEG_BIN,
  
          '-i', INPUT_VID,
  
          '-f', 'image2pipe',
  
          '-pix_fmt', 'rgb24',
  
          '-vcodec', 'rawvideo', '-']
  
  pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=10**8)
  
  n = 0
  
  im2 = []
  
  try:
  
      mog = cv2.BackgroundSubtractorMOG2(120,2,True)
  
      while True:
  
          raw_image = pipe.stdout.read(res[0]*res[1]*3)
  
          # transform the byte read into a numpy array
  
          image =  np.fromstring(raw_image, dtype='uint8')
  
          image = image.reshape((res[1],res[0],3))
  
          rgbImg = image.copy()
  
  
  
          fname = ('_tmp%03d.png'%time.time())
  
          cv2.imwrite(fname, rgbImg)
  
          # throw away the data in the pipe's buffer.
  
          #pipe.stdout.flush()
  
          n += 1
  
          print n
  
  except:
  
      print 'done',n
  
      pipe.kill()
  
      cv2.destroyAllWindows()

  When I run this, I get 10 images, but they all have a Blue Tint ! I cannot for the life of me figure out why. I’ve done tons of searches, I’ve tried quite a few different codecs (usually just messes things up worse). The media info for the video file is here :

   General
  
   Complete name                            : test.avi
  
  Format                                   : AVI
  
  Format/Info                              : Audio Video Interleave
  
  File size                                : 85.0 KiB
  
  Duration                                 : 133ms
  
  Overall bit rate                         : 5 235 Kbps
  
  
  
  Video
  
  ID                                       : 0
  
  Format                                   : JPEG
  
  Codec ID                                 : MJPG
  
  Duration                                 : 133ms
  
  Bit rate                                 : 1 240 Kbps
  
  Width                                    : 640 pixels
  
  Height                                   : 480 pixels
  
  Display aspect ratio                     : 4:3
  
  Frame rate                               : 30.000 fps
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:2
  
  Bit depth                                : 8 bits
  
  Compression mode                         : Lossy
  
  Bits/(Pixel*Frame)                       : 0.135
  
  Stream size                              : 20.1 KiB (24%)

  Any suggestions ? It seems like it should be an RGB mixup...just not sure where at...

• avcodec/nvenc : Add support for H.265 encoding

  24 mars 2015, par Philip Langdale

  avcodec/nvenc : Add support for H.265 encoding
  Sufficiently new nvenc hardware (GM20x or later) has support for H.265
  
  encoding. This works the same as the H.264 encoder except the
  
  codec parameters are different.
  Due to the fact that common codec parameters are not shareable, there’s
  
  quite a bit of conditional logic you’d wish we could do without, but
  
  such is life.
  Signed-off-by : Philip Langdale <philipl@overt.org>
  
  Reviewed-by : Timo Rothenpieler <timo@rothenpieler.org>
  

  • [DH] libavcodec/Makefile
  • [DH] libavcodec/allcodecs.c
  • [DH] libavcodec/nvenc.c