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• How to detect blue screen of ffmpeg video packet ?

  28 novembre 2017, par 심상원

  Good morning. There is one question about FFMPEG.

  I’m using FFMPEG to study C ++ on Linux.

  When the camera spirituality is RTSP and the format is H.264,

  I would like to determine if the camera image is a blue screen, but the following concepts are confusing.

  1. KeyFrame comes in 1 second or every X seconds cycle. Does the KeyFrame get delivered from the camera even if it is still the same image ?

  2. If the KeyFrame is delivered, is the size of the packet transmitted between the cycles zero ?

  3. If the above method is the same as normal image, should I compare the individual frames after decoding ?

  If you do not have any of these questions, please let me know if you have a good way.

  Thank you.

• How should I write my privacy notice for Matomo Analytics under GDPR ?

  24 avril 2018, par InnoCraft

  Important note : this blog post has been written by digital analysts, not lawyers. The purpose of this article is to show you an example of a privacy notice for Matomo under GDPR. This work comes from our interpretation of the UK privacy commission : ICO. It cannot be considered as professional legal advice. So as GDPR, this information is subject to change. We strongly advise you to have a look at the different privacy authorities in order to have up to date information.

  A basic rule of thumb is that if you are not processing personal data, then you do not need to show any privacy notice. But if you are doing so, such as processing full IP addresses, then a privacy notice is required at the time of the data collection. Please note that personal data may also be hidden, for example, in page titles or page URLs.

  In this blog post, we will define what a privacy notice is according to GDPR and how to write it if you are using Matomo and you are processing personal data.

  What is a privacy notice under GDPR ?

  One of the most important rights that a data subject has under GDPR, is the right to be informed about the collection and use of their personal data.

  Here is what ICO is saying about the privacy notice :

  “You must provide individuals with information including : your purposes for processing their personal data, your retention periods for that personal data, and who it will be shared with. We call this ‘privacy information’.”

  “When you collect personal data from the individual it relates to, you must provide them with privacy information at the time you obtain their data.”

  Note that a privacy notice is different from a privacy policy.

  The privacy notice has to include :

  • the reasons why you are processing the personal data
  • for how long
  • who the different parties you are going to share them with are

  So whatever lawful basis you are using (explicit consent or legitimate interest), you need to have a privacy notice if you collect personal data.

  What does this privacy notice look like ?

  ICO is providing best practices in order to display the information :

  • a layered approach
  • dashboards
  • just-in-time notices
  • icons
  • mobile and smart device functionalities

  Once more, it really depends on the data you are processing with Matomo. If you wish to track personal data on the entire website, you will probably have an upper or footer privacy notice such as :

  

  If you wish to process specific data, you could also insert just-in-time notices such as :

  

  What is the information you need to disclose to the final user ?

  To us, there are two things to distinguish between the privacy notice and the privacy policy.

  According to ICO, the privacy notice needs to include the 3 following elements :

  • the reasons why you are processing the personal data
  • for how long
  • who are the different parties you are going to share them with

  But you also need to inform them about :

  • The name and contact details of your organisation.
  • The name and contact details of your representative (if applicable).
  • The contact details of your data protection officer (if applicable).
  • The purposes of the processing.
  • The lawful basis for the processing.
  • The legitimate interests for the processing (if applicable).
  • The categories of personal data obtained (if the personal data is not obtained from the individual it relates to).
  • The recipients or categories of recipients of the personal data.
  • The details of transfers of the personal data to any third countries or international organisations (if applicable).
  • The retention periods for the personal data.
  • The rights available to individuals in respect of the processing.
  • The right to withdraw consent (if applicable).
  • The right to lodge a complaint with a supervisory authority.
  • The source of the personal data (if the personal data is not obtained from the individual it relates to).
  • The details of whether individuals are under a statutory or contractual obligation to provide the personal data (if applicable, and if the personal data is collected from the individual it relates to).
  • The details of the existence of automated decision-making, including profiling (if applicable).

  Pretty long, don’t you think ? In order to reduce it, you can either adopt a layered approach where your “pop-up” window will act as a drop down menu. Or from what we understood, page 5 of this document provided by ICO, a privacy notice can link to a more detailed document, such as a privacy policy page.

  Examples

  Let’s take the example of a website which tracks the non-anonymised full IP address, and using User ID functionality to keep track of logged-in users. Under GDPR, the owner of the website will have to choose either to process personal data based on “Legitimate interests” or on “Consent”. Here is how it will look like :

  Example of a privacy notice under GDPR Legitimate interests

  This site uses Matomo to analyze traffic and help us to improve your user experience.

  We process your email address and IP address and cookies are stored on your browser for 13 months. This data is only processed by us and our web hosting platform. Please read our Privacy Policy to learn more.

  Example of a privacy notice under GDPR Consent

  This site uses Matomo to analyze traffic and help us to improve your user experience.

  We process your email address and IP address and cookies are stored on your browser for 13 months. This data is only processed by us and our web hosting platform.

  [Accept] or [Opt-out]

  Please read our Privacy Policy to learn more.

  Once that information is provided to the user, you can then link it to your privacy policy where you will provide more details about it. Soon we will issue a blog post dealing with how to write a privacy policy page for Matomo.

  The post How should I write my privacy notice for Matomo Analytics under GDPR ? appeared first on Analytics Platform - Matomo.

• How to merge segmented webvtt subtitle files and output a single file ?

  15 février, par Dobbelina

  How to merge a segmented webvtt subtitle file and output a single file ?,
m3u8 looks like this example :

  



  #EXTM3U
#EXT-X-VERSION:4
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-MEDIA-SEQUENCE:1
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-TARGETDURATION:4
#USP-X-TIMESTAMP-MAP:MPEGTS=900000,LOCAL=1970-01-01T00:00:00Z
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-1.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-2.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-3.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-4.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-5.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-6.webvtt
#EXT-X-ENDLIST


  



  I noticed that each segment is not synchronized/cued against total playing time, but against the individual ts segments.
If ffmpeg could be used to do this, what magic input do i need to give it ?

  



  A single correctly cued vtt or srt file is what i want.

  



  I have a great appetite and don't like chunks, lol !

  



  Thanks for any replies you lovely people !

  



  ---

  



  With this i get a merged vtt file, but the cues are all wrong :

  



  ffmpeg -i "https://cmoreseusphlsvod60.akamaized.net/vod/bea44/0ghzi1b2cz5(11792107_ISMUSP).ism/0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000.m3u8" -f segment -segment_time 4 -segment_format webvtt -scodec copy out-%05d.vtt


  



  Each segment is not synchronized/cued against total playing time, but against the individual ts segments.
Example output of above command :

  



  WEBVTT

00:00.000 --> 00:03.040
Du har aktier i ett företag
som saknar framtid.

00:00.000 --> 00:03.280
De vill ha aktierna.
Du känner dem inte, Olga.

00:00.000 --> 00:01.720
De som får Kastrups aktier vinner.


  



  Cues all start like this which isn't very helpfull : 00:00.000

  



  Some segments contains no cues, like segment 15 for example :
https://cmoreseusphlsvod60.akamaized.net/vod/bea44/0ghzi1b2cz5(11792107_ISMUSP).ism/0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-15.webvtt

  



  


  "A WebVTT Segment MAY contain no cues ; this indicates that no
 subtitles are to be displayed during that period."