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• How I can to extract video thumbnails(keyframes) from videofile without blackframes using Ffmpeg ? [on hold]

  21 mars 2014, par user3021440

  How I can to extract video thumbnails(keyframes) from videofile without blackframes using Ffmpeg ? Now, my command is

  ffmpeg -progress "/home/bogdanovich/parser/images/videos/previews/Klondike.2014.S01E01.Paradox.WEBDLRip/original/createlog.txt" -y -ss 10 -timelimit 3600 -i "/home/bogdanovich/Media/Klondike.(s01).Paradox/Klondike.2014.S01E01.Paradox.WEBDLRip.flv" -frames:v 10 -r 0.05 -vf select="isnan(prev_selected_t)+gte(t-prev_selected_t\,180)*eq(pict_type\,I)" -an -vsync vfr "/home/bogdanovich/parser/images/videos/previews/Klondike.2014.S01E01.Paradox.WEBDLRip/original/%03d.jpeg" > /dev/null &

• OpenCV libopencv_core.so.2.4.1 File Not Found

  14 novembre 2013, par benrules2

  I am trying to setup OpenCV v2.4.1 with FFMPEG v0.11 support on Scientific Linux SL release 5.0 (Boron), and I am running into a problem with a missing file that seems completely undocumented. The error I am getting is as follows :

  -- Install configuration: "Release"
  
  
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv/cv.h
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv/cxmisc.h
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv/cvwimage.h
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv2/opencv.hpp
  
  CMake Error at modules/core/cmake_install.cmake:63 (FILE):
  
  file INSTALL cannot find file
  
    "/home/s18/s1138832/OpenCV/lib/libopencv_core.so.2.4.1" to install.
  
  Call Stack (most recent call first):
  
    modules/cmake_install.cmake:57 (INCLUDE)
  
    cmake_install.cmake:56 (INCLUDE)

  I honestly don't know where to begin troubleshooting this at this point. I successfully installed without ffmpeg a few days ago, but now I can't even install with ffmpeg support set to off.

  The files that link to the missing library are :

  lrwxrwxrwx 1 s1138832 s18      21 Jun 17 18:26 libopencv_core.so ->    libopencv_core.so.2.4
  
  lrwxrwxrwx 1 s1138832 s18      23 Jun 17 18:26 libopencv_core.so.2.4 -> libopencv_core.so.2.4.1

  Any advice or prods in the right direction would be much appreciated. I would also be happy to provide more info on whatever interesting details I may have omitted.

  UPDATES : This website seems to have the same error, but I can't read it and translations patchy - http://www.opencv.org.cn/forum/viewtopic.php?f=1&t=15664 ( http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.opencv.org.cn%2Fforum%2Fviewtopic.php%3Ff%3D1%26t%3D15664&act=url )

  libopencv_core.so.2.4.1 exists after "make", but "make install" deletes it somehow. I copied it and added it again, but it didn't change anything

• Size Discrepany in the ‘du’ Command

  22 juin 2012, par Multimedia Mike — General

  I had a problem today while using the common Unix command ’du’. As a refresher, ’du’ stands for disk usage and is a handy tool for understanding how much disk space is being occupied.

  I think ’du’ is probably doing the right thing. The problem might be that I’m getting strange (read : 1/2 the expected number) when running the tool against directories on vmhgfs, the VMware filesystem.

  Science Project
  On an Ubuntu Linux VMware session, my home directory is on the main file system, which is ext4. The directory /mnt/hgfs is reported by ’mount’ to be of type vmhgfs and is shared with the host machine.

  Create a directory in the home directory and generate a 10 MiB file :

  mkdir /home/melanson/dir
  dd if=/dev/urandom of=/home/melanson/dir/random-file bs=1048576 count=10
  

  Create a directory on the shared drive and copy the same file :

  mkdir /mnt/hgfs/vmshare/dir
  cp /home/melanson/dir/random-file /mnt/hgfs/vmshare/dir
  

  Run ’du’ on each directory using the -k and -h options :

  du -k /home/melanson/dir /mnt/hgfs/vmshare/dir
  10244   /home/melanson/dir
  5120    /mnt/hgfs/vmshare/dir
  du -h /home/melanson/dir /mnt/hgfs/vmshare/dir
  
  11M    /home/melanson/directory
  
  5.0M   /mnt/hgfs/vmshare/directory
  

  I noticed this discrepancy when I was trying to pack a set of files (akin to ’tar’-ing) living in a directory in the shared location. I was going mad trying to understand why the original directory was only 2 MB as reported by ’du’ but the final packed file was 4 MB.

  To be fair, the man page for ’du’ succinctly states that the tool’s purpose is merely to "estimate file space usage".