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• Best streaming way for images generated on the fly

  28 novembre 2018, par Vincent Bavaro

  Good morning,
  I have a server that sends me an increasing sequence of images and I need to stream them as a VOD to anyone that, after it inputs username and password in a simple HTML5 site, accesses them. I found ffmpeg to be the best solution so I’m studying it a lot these days. I wanted to know from experts in ffmpeg and streaming, what should be my main route to follow for my purposes.

  My personal thought and what I’m working on is to have ffmpeg encode the images on the fly to a video through a pipe, and then with another command have it transformed into segmented MPeg-4 and playlist for HLS stream, I think I will use an apache webserver for that as well. Is this the best course to follow ? Anyone has better/more efficient (like a single command)/more easy solutions to develop ?

• 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.

• 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 !