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• FFMPEG hwaccel convert WEBM to MP4 video failed : could not find codec parameters

  1er juillet 2020, par Yen Nguyen

  I use FFMPEG to convert webm videos into mp4 format using a Nvidia GPU GeoForce GTX 1660 card on Windows 10. It has worked perfectly since the beginning for few months but now it's stopped working with strange error as below :

  



  [h264 @ 0000013d8b5eee00] missing picture in access unit with size 431
[extract_extradata @ 0000013d8b6aef40] No start code is found.
big-buck-bunny-trailer.webm: could not find codec parameters


  



  FFMPEG version and Nvidia driver version are the same as before it just crashed overnight without a clue. I tried Googling around and did update to the latest ffmpeg version as well Nvidia driver version but it still doesn't help.
If I switch to CPU decoder (without hwaccel arg) using libx264 it just works fine.

  



  Environment Windows 10 64bit | ffmpeg version git-2020-04-15-51db0a4 (latest) | Nvidia GeForce GTX 1660, 
 - Geoforce Game Ready Driver version:445.87 Release Date Apr 15, 2020

  



   ffmpeg -y -vsync 0 -hwaccel cuvid -c:v h264_cuvid -i big-buck-bunny-trailer.webm -c:v h264_nvenc output.mp4

ffmpeg version git-2020-04-15-51db0a4 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200328
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 42.102 / 56. 42.102
  libavcodec     58. 78.102 / 58. 78.102
  libavformat    58. 42.100 / 58. 42.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 77.101 /  7. 77.101
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
[h264 @ 0000013d8b5eee00] missing picture in access unit with size 431
[extract_extradata @ 0000013d8b6aef40] No start code is found.
big-buck-bunny-trailer.webm: could not find codec parameters
WARNING: defaulting hwaccel_output_format to cuda for compatibility with old commandlines. This behaviour is DEPRECATED and will be removed in the future. Please explicitly set "-hwaccel_output_format cuda".
Guessed Channel Layout for Input Stream #0.1 : mono
Input #0, matroska,webm, from 'big-buck-bunny-trailer.webm':
  Metadata:
    encoder         : http://sourceforge.net/projects/yamka
    creation_time   : 2010-05-20T08:21:12.000000Z
  Duration: 00:00:32.48, bitrate: N/A
    Stream #0:0(eng): Video: h264, none, 640x360, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn (default)
    Stream #0:1(eng): Audio: vorbis, 44100 Hz, mono (default)
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (h264_cuvid) -> h264 (h264_nvenc))
  Stream #0:1 -> #0:1 (vorbis (native) -> aac (native))
Press [q] to stop, [?] for help
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 66
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1339
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1415
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1908
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2123
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2504
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2294
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2684
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2468
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2622
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2867
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2737
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 3017
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2556
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 7811
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1880
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1722
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2309
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1215
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2080
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1775
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2247
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1782
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1945
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1529
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1807
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2015
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1568
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2159
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1861
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2397
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1627
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2364
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1821
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2282
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2068
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1699
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2129
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2268
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2197
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1981
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2169
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2888
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1600
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2958
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1518
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2738
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2319
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2421
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2841
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 1949
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2422
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2288
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2559
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2332
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2403
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2257
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2573
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2320
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2231
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2408
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2415
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2194
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2697
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2480
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2256
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2245
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2519
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2203
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2332
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2341
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2439
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2201
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2882
[NULL @ 0000013d8b5eee00] missing picture in access unit with size 2467
Too many packets buffered for output stream 0:1.
[aac @ 0000013d8b6bf5c0] Qavg: 115.929
[aac @ 0000013d8b6bf5c0] 2 frames left in the queue on closing
Conversion failed!


  



  Does anyone know how to fix it, i am getting stuck for few days ?
Much appreciated !

  


• Paid Advertising Performance – target the right customers and invest confidently

  21 avril 2020, par Joselyn Khor — Development, Marketing, Plugins
  You can now analyse the success of your Google Ads campaigns and accounts directly in your Matomo with ease. See what keywords and search queries are leading to clicks for your paid ads and bringing your business the highest ROI, right down to devices and networks – for more effective targeting.

  For many Matomo users, Google Ads is the lifeline for their business. If people are looking for products you sell, you’ll want them to find you first.

  Invest confidently in the right keywords and target the right customers for higher ROI

  You can accurately measure the success of your impressions, clicks, costs, CPC and CPAs and see how they directly relate to the goals you’ve created in your Matomo.

  -> Read the rest of the story on the Form Analytics Marketplace page.

  What does the new Paid Advertising Performance feature look like ?

  The PPC Advertising Performance plugin integrates seamlessly with Matomo’s Row Evolution feature to show you how the performance of your campaigns change over time. This way you can see if the changes you’ve made have a positive or negative effect on sales over time.

  

  The Visitor Profiles feature is also integrated within the plugin so you can get a detailed overview of everyone who clicks on your ads. This will tell you if they have visited your website in the past and to what extent, so you can identify and target more like-minded customers for more sales when setting up your next campaign.

  

  Where do I get the Paid Advertising Performance feature ?

  Paid Advertising Performance is available on the Matomo Marketplace :

  Get the Paid Advertising Performance feature here

  Learn more from the PaidAdvertisingPerformance user guide and FAQs.

• 12 ways Matomo Analytics helps you to protect your visitor’s privacy

  5 mai 2020, par InnoCraft — Analytics Tips, Privacy, Security

  This post was originally published on January 11, 2017, and updated on May, 2020.

  At Matomo we think privacy matters. From the beginning, Matomo has had a strong focus on privacy and ensuring the privacy of your visitors and analytics data. 

  Here are some ways how you can ensure your users and visitors privacy by using Matomo (Piwik).

  1. Owning the data gives you power to protect user privacy

  Whether you host Matomo on-premises yourself, or whether you use Matomo’s cloud, YOU keep control of your data and nobody else. By knowing exactly where your data is stored and having full control over what happens to it, you have the power to protect your user’s privacy. No-one else can claim ownership. 

  2. GDPR compliance

  GDPR is one of the most important privacy laws to have come out in the last few years. As such, Matomo takes GDPR compliance very seriously. There’s even a 12-step checklist for you to follow to ensure your Matomo is GDPR compliant. Not only that Matomo is HIPAA, CCPA, LGPD, and PECR compliant.

  3. Data anonymization

  For better privacy by default, Matomo implements a range of data anonymization techniques. One of the main techniques is not recording the full IP address of your visitors. Some countries even require you to anonymize additional info considered Personally Identifiable Information (PII).

  To change the IP anonymization settings go to “Administration > Privacy”. 

  

  4. Configuring Matomo to not process personal data or personally identifiable information (PII)

  To further protect the privacy of your visitors, you can learn how to not process any personal information or PII. 

  5. Deleting old visitor logs

  The is important because visitor logs contain information all the collected raw data about every visitor and every action. You can configure Matomo to automatically delete logs from the database. When you delete old logs, only the real time and visitor log reports will no longer work for this old time period, all other aggregated reports will still work.

  For privacy reasons, we highly recommend that you keep the detailed Matomo logs for only 3 to 6 months and delete older log data. This has one other nice side effect : it will free significant database space, which will, in turn, slightly increase performance !

  

  6. Supporting the Do Not Track preference

  Do Not Track enables users to opt out of any tracking by websites they do not visit, including analytics services, advertising networks, and social platforms. By default, Matomo respects users preference and will not track visitors which have specified “I do not want to be tracked” in their web browsers. Get more information about DoNotTrack.

  To make sure Do Not Track is respected, go to “Administration => Privacy”.

  7. Including an Opt-Out Feature on your website or app

  By embedding the Opt-Out feature in your website, you give your visitors the possibility to opt-out of the tracking. When you go to “Administration > Privacy”, you will be able to copy and paste an HTML Iframe code to embed the opt-out feature for example into your privacy policy page or in your ‘Legal’ page. Your users can then click on a link to opt-out.

  On the Matomo Marketplace there are also some plugins available to customize the Opt-Out experience. For example AjaxOptOut and CustomOptOut.

  

  8. Disabling Live features

  The Real-Time, Visitor Log and Visitor Profile features give you insights into the tracked raw data by showing you details about every visitor and every action they performed. To protect the privacy of your visitors you may decide to prevent access to such features by disabling the “Live” plugin in “Administration => Plugins”. This way only aggregated reports will be shown in your Matomo.

  9. Disabling fingerprinting across websites

  By default, when one of your visitors visits several of your websites, Matomo will create a fingerprint for this user that will be different across the websites to increase the visitors’ privacy. You can make sure that this feature is disabled by going to “Administration => Config file” and verifying that the value of “enable_fingerprinting_across_websites” is set to zero.

  10. Disabling tracking cookies

  Matomo uses first-party cookies to store some information about visitors between visits. In some countries, the legislation requires websites to provide a way for users to opt-out of all tracking, in particular tracking cookies. You can disable cookies by adding one line in the Matomo Javascript code.

  11. Creating the tool of your dreams by developing your own plugins and getting access to the API

  Matomo is an open platform that lets you extend and customise the tracking ; reporting ; and user interface to your needs and to protect your visitors’ privacy the way you want or need it. Learn more in the Matomo Developer Zone. You may also have a look at our Matomo Marketplace where you can find several free and premium features to extend your Matomo.

  12. Transparency

  By default, all information and all collected data in your Matomo server are protected and nobody can access it. However, Matomo allows you to optionally make your collected data public and you can export any Matomo report including the whole dashboard to embed it into your website. This way you can show your users exactly which information you track. When you decide to make reports public, we do our best to protect privacy and automatically hide any Personally Identifiable Information such as the Visitor Profile and we make sure to not show any Visitor IP address and the Visitor ID.

  Bonus tip – A privacy policy template for you

  When you use Matomo to track your visitors, we recommend you update your Privacy Policy to explain how Matomo is used and what data it gathers. Here’s a Privacy Policy template for you to copy on your site.

  Continuous privacy improvements

  We are always interested in improving the privacy. If you miss any feature or have an idea on how to improve the privacy, please let us know.

  More information about all the Matomo features

  If you want to learn more about all the features in Matomo, have a look at our User Guides and FAQ entries.