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• Is it possible to merge two or more videos in real-time like this ?

  25 février 2015, par Marko

  Is it possible to play video online that’s made of two or more video files ?

  Since my original post wasn’t clear enough, here’s expanded explanation and question.

  My site is hosted on Linux/Apache/PHP server. I have video files in FLV/F4V format. I can also convert them to other available formats if necessary. All videos have same aspect ratio and other parameters.

  What I want is to build (or use if exist) online video player that plays video composed of multiple video files concatenated together in real-time, i.e. when user clicks to see a video.

  For example, visitor comes to my site and sees video titled "Welcome" available to play. When he/she clicks to play that video, I take video files "Opening.f4v", "Welcome.f4v" and "Ending.f4v" and join/merge/concatenate them one after another to create one continuous video on the fly.

  Resulting video looks like one video, with no visual clues, lags or even smallest observable delay between video parts. Basically what is done is some form of on-the-fly editing or pre-editing, and user sees the result. This resulting video is not saved on the server, it’s just composed and played that way real-time.

  Also, if possible, user shouldn’t be made to wait for this merging to be over before he/she sees resulting video, but to be able to get first part of the video playing immediately, while merging is done simultaneously.

  Is this possible with flash/actionscript, ffmpeg, html5 or some other online technology ? I don’t need explanation how it’s possible, just a nod that it’s possible and some links to further investigate.

  Also, if one option is to use flash, what are alternatives for making this work when site is visited from iphone/ipad ?

• New Piwik Mobile 2.2.0 is released

  21 décembre 2014, par Thomas Steur — Piwik Mobile Releases

  We are proud to announce that Piwik Mobile 2.2.0 is now available ! This new version brings many improvements to our Android app. Here’s the list of changes :

  • Android : The keyboard is no longer displayed when opening the app [#5320]
  • Android : Back button did not work in a few screens and could cause the app to unexpectedly close under circumstances [#5316]
  • Android : The graph is now displayed fullscreen on tablets when maximizing it [#5315]
  • Android : New material design icons [#5310]
  • Android : Better exit workflow – we now open the left sidebar before closing the app if the left sidebar was opened at least once. Another back button press closes the app [#4305]
  • iOS : The left sidebar was positioned too far down on iPhone 4s with iOS 8 [#5306]
  • Region is now shown in visitor screen if possible [#5300]
  • Other performance, UI and usability improvements
  • List of all 18 closed issues

  Download

  Update now or install either the iOS version or the Android version.
  In case you are an Android user who is not using the Google Play Store you can download Piwik Mobile 2.2.0 for Android 4+.

  Feel free to send us feature wishes, bug reports, wireframes, mockups or even layouts. We can improve Piwik Mobile much better with your feedback. and suggestions

• Timelapse (1/6 fps) from slo-mo (240 fps) with ffmpeg

  4 avril 2022, par baskak

  I recorded slo-mo video on an iPhone SE (2) by mistake instead of timelapse.

  


  I know there's a lot of answers to this question here, but I'm trying again and again and always something's wrong (like a video that has a correct total no. of frames, but lasts 3 hours and is basically a freeze :D )
My recent command was

  


  


  ffmpeg -i IMG_2174.MOV -vf framestep=1440,setpts=N/120/TB -c:v libx264
-preset slow -crf 22 -an -r 30 IMG_2174.timelapse.MOV

  


  


  but it resulted in a one-second-long video, so way over-timelapsed. Should be several seconds IINM. The source video is 30 minutes long @240fps, 17GB.
Thx.