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• Revision b4b5af6acd : Use SATD based mode decision for block sizes below 16x16 This commit makes the

  30 mars 2015, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_pickmode.c

  
  
  Use SATD based mode decision for block sizes below 16x16

  This commit makes the encoder to select between SATD/variance as
  metric for mode decision. It also allows to account chroma
  component costs for mode decision as well. The overall encoding
  time increase as compared to variance based mode selection is about
  15% for speed -6. The compression performance is on average 2.2%
  better than variance based approach, with about 5% compression
  performance gains for hard clips (e.g., jimredvga, nikas720p, and
  mmmoving) at lower bit-rate range.

  Change-Id : I4d04a31d36f4fcb3f5f491dacd6e7fe44cb9d815

• ffmpeg video convert library on my VPS Linux based godaddy server not working

  6 mai 2017, par mahesh vora

  I have some query here for using your ffmpeg video convert library on my VPS Linux based godaddy server.

  I have php 5.6.30 version on my server and I want to use your ffmpeg video convert library on my server so I can use that with 5.6.30 php version ?

  As I have already many time try my self to install it but each time I am getting different errors while installing process so after that for installation of it on my server I have taken godaddy’s support team help and paid them $100 for install ffmpeg on my VPS server then in end (after 12 days) they said me ffmpeg will work with older version of php only (they saying it will work until you will have php 4.0 after that with any latest version of php it will not work) so they said me downgrade your php version then only it will work, but I can’t do that as I if I will do that then I will fetch some other issues in my project.

  So here can you please confirm "your ffmpeg video convert library will work with my php version 5.6.30 (website hosted on godaddy’s VPS Linux based server)" ?

  if not working then please suggest me to best other similar library similar to ffmpeg i want only two of the functionality 1) to cut the video 2)may be compress 3)Create thumb from the video.

  Waiting for valuable response !

• Web-based video editor

  10 octobre 2014, par Danny

  We have a web-based editor currently that allows users to build animated web apps. The apps are made up of shapes, text, images, and videos. Except for videos, all other elements can also be animated around the screen. The result of building a animated app is basically a big blob of JSON.

  The playback code for the web app is web-based as well. It takes the JSON blob and constructs the HTML, which ends up playing back in some sort of browser environment. The problem is that most of the time this playback occurs on lower-end hardware like televisions and set-top boxes.

  These performance issues go away if there is some way to be able to convert a digital sign to video. Then the STB/smart TV simply plays a video, which is much more performant than playing back animations in a web view.

  Given a blob of JSON describing each layer and how to draw each type of object, its animation points, etc, how could I somehow take that and convert it to video on the server ?

  My first attempt at this was using PhantomJS to load the playback page in a headless browser, take a series of screenshots, and then use ffmpeg to merge those screenshots into a video. That worked great so long as there is no video. But it does not work with video since there is no HTML5 video tag support in PhantomJS, and even if there was, I would lose any audio.

  The other way I was thinking of doing it would be to again load the playback page in PhantomJS, but turn off the video layers and leave them transparent, then take screenshots as a series of PNGs with transparency. I would then combine these with the video layers.

  None of this feels very elegant though. I know there are web-based video editors out there that basically do what I’m trying to accomplish, so how do they do it ?