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• ffmpeg color, size and amplitude

  9 décembre 2017, par user266005

  Trying to get ffmpeg to create an audio waveform while being able to control the image size, color, and amplitude. I have tried this (and many variations) but it just returns unmatched " .

  ffmpeg -i input -filter_complex "aformat=channel_layouts=mono,compand=gain=-3,showwavespic=s=1000x350,color=s=1000x350:color=A072FD” -frames:v 1 output.png

  Thoughts ?

• Power-Up your Piwik installation with Custom Reports

  13 novembre 2017, par InnoCraft — Plugins

  Would you like to create a report in Piwik with just the data you want and nothing else ? Would you like to be free to decide the shape of it ? Are you struggling with the Piwik database and wish you could have an easy interface to create the report you want ? Are you tired of exporting your data in a spreadsheet ? Since last October, there’s a solution and it’s called Custom Reports.

  With custom reports you will :

  1. get a user-friendly interface to create the report you wish
  2. see all the possible combinations to create the report you desire
  3. reveal new data combinations which were not directly available in Piwik

  User friendly interface

  The time when you created your reports from MySQL database is over. Now with custom reports you can create the report you want and get the data you need in just a few seconds.
  Custom reports are part of the main user interface. You can access them in just one click :

  

  As you can see from above the interface is straightforward, just indicate the name of your report and start to select the dimensions and metrics you would like to see.

  See all the possible combinations to create the report you desire

  As a user the big question has always been, how much data does Piwik collect and where can I find a list of all those data points ? Here you have the solution. Piwik is gathering in custom reports all the possible combinations so you can select only the data you want :

  

  Creating such a report is going to take you no more than a minute. As with any reports within Piwik, you can easily get information regarding the specific data you are using by hovering your mouse on the question mark next to each dimension and metric :

  

  Make new combinations which were not directly available in Piwik

  By default, not all combinations are possible within the Piwik user interface. Now thanks to Custom Reports, you can easily design the report you want. Here is for example a report crossing page titles and page url :

  

  You can then identify if there are any duplicate titles within your content and see the associated URL in a single report.

  You could also identify easily what are your most viewed entry page from Google :

  

  Custom reports can also be used with segments and filters in order to get even more specific data.
  Here we have an example of a custom report designed to take into consideration only the visits coming from Wikipedia :

  

  What is the next step ?

  As you understood it, Piwik custom reports is the must-have plugin in order to take your Piwik to the next level. Why wait ? Piwik custom reports are available through the marketplace.

  Get Custom Reports

  If you are not sure yet, you can always give it a try within our Piwik Cloud infrastructure.

• Getting An Indexed Color Table to Encode Custom Filetype FFmpeg

  16 février 2018, par ThoseKind

  I am messing with a custom image format to be supported in FFmpeg with a custom encoder and decoder. In order to encode images, it seems like using an indexed color table is a good approach, but I am unsure if this is something that FFmpeg can already provide me or if this is something that I will have to build functionality for myself.

  Does FFmpeg have built-in functionality to get an indexed color table from an input stream ?

  If so, what are they ?

  If not, are there any good resources to learn about the best way to do this ?