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• OpenCV in Python on Windows does not report correct video properties from VideoReader

  24 décembre 2015, par Mircea Davidescu

  I am running into a problem with using VideoReader in OpenCV with Python. Many of the properties that I should be able to get from the video reader are either somehow invalid (returning 0), or return the wrong number. For instance.

  vidFile = cv2.VideoCapture('movie.avi')
  
  vidFile.get(cv2.CAP_PROP_FRAME_COUNT)
  
  vidFile.get(cv2.CAP_PROP_FPS)

  The first get command returns a wrong value, while the second get command returns 0. The output of the ffprobe command is given below :

  built with gcc 5.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls 
  
  --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm 
  
  --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus 
  
  --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab 
  
  --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 
  
  --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55.  5.100 / 55.  5.100
  
    libavcodec     57. 12.100 / 57. 12.100
  
    libavformat    57. 11.100 / 57. 11.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 14.101 /  6. 14.101
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, avi, from 'movie.avi':
  
    Metadata:
  
      encoder         : Lavf55.0.100
  
    Duration: 00:31:59.97, start: 0.000000, bitrate: 24321 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj420p(pc, bt470bg/unknown/unknown), 1392x1040 [SAR 1:1 DAR 87:65], 24316 kb/s, 30 fps, 30 tbr, 30 tbn, 
  
  30 tbc

  I am running a Windows 10 machine with Python 2.7.11 (Anaconda 2.4.1 64-bit). I have installed OpenCV 3.0.0 according the instructions provided here. Because I am using the VideoReader feature I also added C :\opencv\sources\3rdparty\ffmpeg to the system PATH and renamed both opencv_ffmpeg300.dll and opencv_ffmpeg_x64.dll to opencv_ffmpeg300.dll and opencv_ffmpeg300_64.dll respectively, as specified here.

  Thank you for your help with this problem !

• Update bar-ui.js

  16 septembre 2015, par minorgod

  Update bar-ui.js
  When using a playlist that has divs nested inside li elements, clicking the "next" button on the player interface results in the parent div of the next playlist link being passed to findOffsetFromItem, which returns -1 and resets the playlist back to the first item. Passing the "liElement" instead of the "item" fixes this. You will not see this problem when testing the demo on http://www.schillmania.com/projects/soundmanager2/demo/bar-ui/, because the example playlists only have nested divs in the first playlist item. If you change the playlists to have multiple items containing nested divs you’ll see that it breaks the "next" button functionality.
  

• Core : guard against null & undefined values in required method

  2 septembre 2017, par Arkni

  Core : guard against null & undefined values in required method
  An input element will never have undefined or null as value
  
  but the normalizer may return null or undefined for an element.
  Also, jQuery (< 3.x) returns `null` for select element with the
  
  multiple attribute set if no options are selected.
  As a result, the required method should guard against that.