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• Why is one ffmpeg webm dash stream much larger than the others ?

  5 janvier 2017, par ranvel

  Over the summer, I worked on putting together a script which took a x264 video/mp3 stream and broke it up into the different streams so that it would work via MSE-DASH. (Based heavily on the instructions on the webmproject.org website) Those same scripts have ceased to work, turning a 6GB video into several 25 Gb videos. I kept up with updates of ffmpeg and so I don’t know when it stopped working, but I am guessing it was due to the way that their DASH Webm implementation was updated.

  I found new method which works better, but still has a major problem with one stream. I was hoping someone could explain how this encoding works so that I could understand the underlying cause.

  #!/bin/bash
  
  COMMON_OPTS="-map 0:0 -an -threads 11 -cpu-used 4 -cmp chroma"
  
  WEBM_OPTS="-f webm -c:v vp9 -keyint_min 50 -g 50 -dash 1"
  
  
  
  ffmpeg -i $1 -vn -acodec libvorbis -ab 128k audio.webm &
  
  ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 500k -vf scale=1280:720 -y vid-500k.webm &
  
  ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 700k -vf scale=1280:720 -y vid-700k.webm & 
  
  ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 1000k -vf scale=1280:720 -y vid-1000k.webm &
  
  ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 1500k -vf scale=1280:720 -y vid-1500k.webm  

  The transcode is not yet complete, but you can see where this is headed :

  -rw-r--r--  1 user  staff    87M Jan  4 23:27 audio.webm
  
  -rw-r--r--  1 user  staff    27M Jan  4 23:42 vid-1000k.webm
  
  -rw-r--r--  1 user  staff   285M Jan  4 23:42 vid-1500k.webm
  
  -rw-r--r--  1 user  staff    15M Jan  4 23:42 vid-500k.webm
  
  -rw-r--r--  1 user  staff    20M Jan  4 23:42 vid-700k.webm

  The 1500k variant is disproportionately larger than the other streams.

  The other problem is that when I use a shorter video, lets say eight or nine minutes, the above configuration runs as expected and everything is perfect. I don’t know where the limit for this is since each test costs a lot of processing power and time, but if it’s less than ten minutes, it works and if its longer than an hour, it produces massive files.

• Grow your business and understand your conversion funnel with Funnels for Piwik

  14 décembre 2016, par InnoCraft — Plugins

  Hi, this is Tom from InnoCraft. The company of the makers of Piwik.

  No matter what type of website or app you have, whether you are trying to get your users to sign up for something or sell products, there is a certain number of steps your visitors have to go through. I bet the same applies to you.

  Have you ever wondered if your visitors or users actually follow that path in your website or app ? And wondered where you lose your visitors ? Where they maybe get confused ? Want to see when something is not working anymore ? Maybe you have a multi step signup form or onboarding process ? On every step you lose visitors and therefore potential revenue and conversions. It’s critical to know how well your visitors go through these steps, where they originally came from and where they go to when they drop off.

  If you are wondering about such things like we do, or want to drive your conversions and sales, we have something for you.

  -> Read the rest of the story on the Funnels Marketplace page.

  What does the new Funnel report look like ?

  Here is below just a little preview of the Funnel report.

  

  You get this funnel report for each of your goals so you can optimise each of your conversion funnels.

  Where do I get Funnel for Piwik ?

  Funnels is available on the Piwik Marketplace :

  Get Funnel on the Marketplace

  Funnels is premium plugin for Piwik and comes with our 14 day money back guarantee and 1-click installation & updates (all product updates come for free).

  You can also signup for a free Piwik Cloud-hosted trial to discover the power of Funnels !

• Users Flow for Piwik : discover the most popular paths your users take through your website or app

  14 décembre 2016, par InnoCraft — Plugins

  Hi, this is Tom from InnoCraft. The company of the makers of Piwik.

  Do you know how your visitors navigate through your website or app ? Well, we thought we did, but it turned out we didn’t until we actually were able to visualize those paths over several steps in an easy to understand graph. We were really surprised by some paths our users took every day. We discovered new popular pages where we totally under-estimated their importance. We found that many users actually had a problem on our home page so they had to reload it and we improved some popular paths we didn’t expect users were going. Now these paths are much more straight-forward for our users.

  -> Read the rest of the story on the Users Flow Marketplace page.

  What does the new Users Flow report look like ?

  Here is below just a little preview of the Users Flow report. The plugin includes more reports and goodies !

  

  Where do I get Users Flow ?

  Users Flow is available on the Piwik Marketplace :

  Get Users Flow on the Marketplace

  Users Flow is premium plugin for Piwik and comes with our 14 day money back guarantee and 1-click installation & updates (all product updates come for free).

  You can also signup for a free Piwik Cloud-hosted trial to discover the power of Users Flow !

  Happy Analytics,