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• poster adjustment after getting it from video

  30 juin 2016, par Jass

  I am capturing poster from this video https://www.youtube.com/watch?v=wg-kEWsL6Xc using following code. Video can be any, I am just giving example.

  shell_exec('ffmpeg -y  -itsoffset -4  -i "'.base_path().'/assets/videos/'.$file_name.'.mp4" -vcodec mjpeg -vframes 1 -an -f rawvideo -filter:v scale=1170:ih*1170/iw "'.base_path().'/assets/videos/thumbnail/'.$file_name.'.jpg"')

  Width = 1170px,

  Height= 300px (as it is background image so it does not matter)

  But I am facing adjustment problem. Following are my current views

  First : Head is cutting, here I am using css property background : url(’completepath’) center no-repeat ;
  

  Second : Showing black portion on top of head. This is the original image that I am getting from ffmpeg code.

  

  My Question : But I need image like in you tube, you can notice that in all videos we can see top portion of humans without being cutting even black portion is well adjusted.

  Currently I am downloading and testing with youtube videos but in actual job seekers will make their own videos using android/iphone or any camera and will upload on our site.

  so how i can overcome this issue means show image with proper human face and body ?

  thanks in advance.

• FFMPEG Open several video files at the same time ? C++ [on hold]

  8 octobre 2017, par LemanRass

  I wrote a C++ plugin for playing videos using FFmpeg libraries. All works perfectly when playing a single video, but when I try to play at least 2 videos at the same time I have these errors :

  #01 pc 0000714d  /data/app/com.ffmpeg.sdk.videoplugin-
  
  1/lib/arm/libAndroidVideoPlugin.so (_ZN12FFmpegReader13ReadNextFrameEPvPc+404)
  
  #02 pc 00005a9f  /data/app/com.ffmpeg.sdk.videoplugin-
  
  1/lib/arm/libAndroidVideoPlugin.so (_ZN9Videofile17UpdateFramesCacheEv+118)
  
  #03 pc 000057d1  /data/app/com.ffmpeg.sdk.videoplugin-
  
  1/lib/arm/libAndroidVideoPlugin.so (_firstUpdateThread+80)

  It seems that when I open the second video it, replaces the first one.
  I came up with this idea when I opened 2 videos one by one (without any errors) then I started to play only the second one and as a result I didn’t get any errors. But when I tried to read frames from the first video, my app crashed with the error above.

  A bit about plugin`s structure :

  1. I created a class called FFmpegReader where methods work
     directly with ffmpeg (Opening file, ReadFrames and returning them as void*,
     Seek and Close).

  2. Then I created one more class which creates a FFmpegReader instance using
     the "new" operator inside its constructor, descriptor (unique id of the opened
     file), queue of cached frames (up to 100 at the same time) and
     methods to operate with FFmpegReader and framesCache.

  3. I created a main file where I created a vector of objects of class from
     the second point I described above. Also I declared 4 threads for each
     opened video file (4 opened videos is the max number of allowed opened
     videos at the same time). They call the method to update a cache of frames in
     its own video file using the video file descriptor. Finally I declared methods
     which will be called from the main app which is using this plugin to retrieve
     cached frames from cache.

  As you can see, I did everything to let it works separately with each new opened video. It seems the problem is inside of FFmpeg. There might be some restrictions I’m not aware of.

  ================UPDATE=================

  Sources of Main: https://pastebin.com/DfGH0BRZ
  
  Sources of Videofile class: https://pastebin.com/WjdS532B
  
  Sources of FFmpegReader class: https://pastebin.com/aPHpBvBv

  Hope it’s gonna help...

• sudo checkinstall - installation failed

  12 janvier 2017, par Mathiem

  I’m trying to install ffmpeg on Raspbian by following these steps :

   cd ffmpeg
  
  ./configure --prefix=/usr
  
  time make -j 8
  
  cat RELEASE
  
  sudo checkinstall

  but when I do the sudo checkinstall step, it gave me an error :

  pi@raspberrypi ~/ffmpeg $ sudo checkinstall -y
  
  
  
  checkinstall 1.6.2, Copyright 2009 Felipe Eduardo Sanchez Diaz Duran
  
             This software is released under the GNU GPL.
  
  
  
  
  
  
  
  *****************************************
  
  **** Debian package creation selected ***
  
  *****************************************
  
  
  
  This package will be built according to these values:
  
  
  
  0 -  Maintainer: [ root@raspberrypi ]
  
  1 -  Summary: [ Package created with checkinstall 1.6.2 ]
  
  2 -  Name:    [ ffmpeg ]
  
  3 -  Version: [  ]
  
  4 -  Release: [ 1 ]
  
  5 -  License: [ GPL ]
  
  6 -  Group:   [ checkinstall ]
  
  7 -  Architecture: [ armhf ]
  
  8 -  Source location: [ ffmpeg ]
  
  9 -  Alternate source location: [  ]
  
  10 - Requires: [  ]
  
  11 - Provides: [ ffmpeg ]
  
  12 - Conflicts: [  ]
  
  13 - Replaces: [  ]
  
  
  
  Enter a number to change any of them or press ENTER to continue:
  
  
  
  Installing with make install...
  
  
  
  ========================= Installation results ===========================
  
  INSTALL doc/ffmpeg.1
  
  INSTALL doc/ffprobe.1
  
  INSTALL doc/ffserver.1
  
  INSTALL doc/ffmpeg-all.1
  
  INSTALL doc/ffprobe-all.1
  
  INSTALL doc/ffserver-all.1
  
  INSTALL doc/ffmpeg-utils.1
  
  INSTALL doc/ffmpeg-scaler.1
  
  INSTALL doc/ffmpeg-resampler.1
  
  INSTALL doc/ffmpeg-codecs.1
  
  INSTALL doc/ffmpeg-bitstream-filters.1
  
  INSTALL doc/ffmpeg-formats.1
  
  INSTALL doc/ffmpeg-protocols.1
  
  INSTALL doc/ffmpeg-devices.1
  
  INSTALL doc/ffmpeg-filters.1
  
  INSTALL doc/libavutil.3
  
  INSTALL doc/libswscale.3
  
  INSTALL doc/libswresample.3
  
  INSTALL doc/libavcodec.3
  
  INSTALL doc/libavformat.3
  
  INSTALL doc/libavdevice.3
  
  INSTALL doc/libavfilter.3
  
  INSTALL doc/ffmpeg.1
  
  INSTALL doc/ffprobe.1
  
  INSTALL doc/ffserver.1
  
  INSTALL doc/ffmpeg-all.1
  
  INSTALL doc/ffprobe-all.1
  
  INSTALL doc/ffserver-all.1
  
  INSTALL doc/ffmpeg-utils.1
  
  INSTALL doc/ffmpeg-scaler.1
  
  INSTALL doc/ffmpeg-resampler.1
  
  INSTALL doc/ffmpeg-codecs.1
  
  INSTALL doc/ffmpeg-bitstream-filters.1
  
  INSTALL doc/ffmpeg-formats.1
  
  INSTALL doc/ffmpeg-protocols.1
  
  INSTALL doc/ffmpeg-devices.1
  
  INSTALL doc/ffmpeg-filters.1
  
  INSTALL doc/libavutil.3
  
  INSTALL doc/libswscale.3
  
  INSTALL doc/libswresample.3
  
  INSTALL doc/libavcodec.3
  
  INSTALL doc/libavformat.3
  
  INSTALL doc/libavdevice.3
  
  INSTALL doc/libavfilter.3
  
  INSTALL install-progs-yes
  
  INSTALL ffmpeg
  
  INSTALL ffprobe
  
  INSTALL ffserver
  
  mkdir: cannot create directory ‘/usr/share/ffmpeg’: No such file or directory
  
  Makefile:161: recipe for target 'install-data' failed
  
  make: *** [install-data] Error 1
  
  
  
  ****  Installation failed. Aborting package creation.
  
  
  
  Cleaning up...OK
  
  
  
  Bye.

  Can anyone help me ? What can I do ? I’m not gonna lie, I’m a noob and I don’t really know where to start, I tried 3-4 things but it didn’t work.

  Thanks !