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• Download a youtube video without storing it on the server

  6 mai 2019, par Baraque Obahamas

  I have a personal php script that allows me to download the videos of my choice. Currently, this runs youtube-dl and if necessary convert the video, ffmpeg then.

  I’m looking for a way to allow my script to download/convert the video without even storing it on the server. Make sure that youtube-dl/ffmpeg acts as a gateway but without downloading the file.

  Do you have any idea how to do this ? The idea would be to run ffmpeg on the youtube link and not on the video after it has been downloaded, and allow the user to download it at the same time as the conversion is in progress.

  We can see that this site for example www.onlinevideoconverter.com uses this method, because if we ask for a video of 2 hours or more, it allows us to download it immediately.

• saving frames from webcam stream

  30 décembre 2018, par Alex Witsil

  I would like a routine that systematically extracts and saves the frames from webcam footage to a local directory on my personal computer.

  Specifically, I am trying to save frames from the webcam at Old Faithful geyser in Yellowstone Natl. Park. (https://www.nps.gov/yell/customcf/geyser_webcam_updated.htm)

  Ideally, I would like to :

  1. be able to control the rate at which frames are downloaded (e.g. take 1 frame every minute)
  2. use FFMPEG or R
  3. Save the actual frame and not a snapshot of the webpage

  Despite point 3 above, I’ve tried simply taking a screenshot in R using the package webshot :

  library(webshot)
  
  i=1
  
  while(i<=2) { 
  
  webshot('https://www.nps.gov/yell/customcf/geyser_webcam_updated.htm',delay=60,paste(i,'.png',sep=""))
  
  
  
  i=i+1
  
  }

  However, from the above code I get these two images :

  
  
  Despite the delay in the webshot() function (60 seconds) the two images are the same not to mention the obvious play button in the middle. This method also seems a bit of a hack as it is saving a snapshot of the website and not the frames themselves.

  I am certainly open to to using more appropriate command line tools (I am just unsure of what they are). Any help is greatly appreciated !

• Use ffmpeg on OSX Xcode Project for Mac

  21 décembre 2018, par cmario

  I am planning to create a new app for personal use on my Mac that uses FFMPEG library, to store a feed from a RTSP IP camera.

  Following this official installation procedure from FFMPEG I have manage to successfully achieve the following 2 steps :

  To get ffmpeg for OS X, you first have to install ​Homebrew. If you don’t want to use Homebrew, see the section below.

  • ruby -e "$(curl -fsSL
    https://raw.githubusercontent.com/Homebrew/install/master/install)"

  Then :
  - brew install automake fdk-aac git lame libass libtool libvorbis
  libvpx \ opus sdl shtool texi2html theora wget x264 xvid yasm

  Question :
  My question here because I am confused, is how to import a library into Xcode so I can use it in the application I am about to build for my Mac. I can see plenty of GitHub projects related to FFMPEG with IOS/Android, but none for OSX.

  All the FFMPEG commands under terminal are working fine, such as converting a video etc.