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• iFrameExtractor no ffmpeg with build_universal script

  15 août 2016, par AlecGamble

  I’m trying to follow this tutorial on how to extract the frames from an iphone video :

  http://www.codza.com/extracting-frames-from-movies-on-iphone#more-343

  It says to do the following :

  • open Terminal
  • clone the repository : git clone git://github.com/lajos/iFrameExtractor.git
  • go to the ffmpeg folder in the project : cd iFrameExtractor/ffmpeg
  • build the ffmpeg libraries : ./build_universal

  So there’s no ffmpeg folder in iFrameExtractor after cloning the repository so I went to the github page and it says to download the latest version of ffmpeg and move to to the ffmpeg folder (I presume it just means within iFrameExtractor) :

  • Download the latest ffmpeg (0.11.1 tested) :
    git clone git://source.ffmpeg.org/ffmpeg.git

  So I’ve done that but there’s no file or directory when I try to run ./build_universal and I can see that there isn’t.

  Any ideas what I’m doing wrong ?

  Alternatively I was also looking at just installing ffmpeg-ios and trying to extract the frames myself :

  https://github.com/kewlbear/FFmpeg-iOS-build-script

  and I’ve run the script so I’ve got that folder in my xcode project as well but I’m unsure on how to link it properly ?

• 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.

• How to make HLS start from the begining

  15 juillet 2016, par Ariel Argañaraz

  I need some help with HLS streaming, I’m trying to create a playlist for streaming,

  I’m using ffmpeg to generate the files and the .m3u8 files. And for playing i’m using a web page with videojs player

  The idea is to simulate a live streaming using files already created.

  The problem is that in some version of iphone works and in another does not work.
  The problem is that when I start play the video in the Safari browser of my phone it freezes for a while and then download and play the last segment.

  for example if the video is split in 4 differents .ts files.
  It starts playing from the 4th .ts file and then stop.

  The problem is that I have 2 iphone mobile phone, one of them works perfectly but the other one not

  The not working cell phone is a iphone 6 (version 9.2.1)

  Here is my m3u8 file. Note that I’m using the #EXT-X-PLAYLIST-TYPE:EVENT and I remove the #EXT-X-ENDLIST from the botton. So it should be played as an live streaming.

  It works for another phones, it begins from the 0 second when I set the #EXT-X-START:TIME-OFFSET=0

  but in this version (9.2.1) the video freezes and then jumps to the last segment (webinar-3.ts) plays that segment and finally stop.

  #EXTM3U
  
  #EXT-X-VERSION:4
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-ALLOW-CACHE:NO
  
  #EXT-X-PLAYLIST-TYPE:EVENT
  
  #EXT-X-START:TIME-OFFSET=0
  
  #EXT-X-TARGETDURATION:6
  
  #EXTINF:5.046444,
  
  webinar-0.ts
  
  #EXTINF:5,
  
  webinar-1.ts
  
  #EXTINF:5,
  
  webinar-2.ts
  
  #EXTINF:5,
  
  webinar-3.ts

  Have anybody got an idea of what i’m doing wrong or how to get a m3u8 config that works for this iphone version ?