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• Unresolved external symbol when linking ffmpeg/avcodec with Visual Studio 2015 ?

  2 décembre 2015, par Ragnar

  I’m trying to build ffmpeg/avcodec library with Visual Studio 2015 and it gives me following linking error :

  allcodecs.obj : error LNK2001: unresolved external symbol ff_h263_vaapi_hwaccel 
  
  allcodecs.obj : error LNK2001: unresolved external symbol ff_h263_vdpau_hwaccel
  
  allcodecs.obj : error LNK2001: unresolved external symbol ff_h263_videotoolbox_hwaccel
  
  ...

  The problem comes from this macro https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/allcodecs.c#L34

  #include "config.h"
  
  #include "avcodec.h"
  
  #include "version.h"
  
  
  
  ...
  
  
  
  #define REGISTER_HWACCEL(X, x)                                      \
  
      {                                                               \
  
          extern AVHWAccel ff_##x##_hwaccel;                          \
  
          if (CONFIG_##X##_HWACCEL)                                   \
  
              av_register_hwaccel(&ff_##x##_hwaccel);                 \
  
      }
  
  
  
  ...
  
  
  
  void avcodec_register_all(void)
  
  {
  
      static int initialized;
  
  
  
      if (initialized)
  
          return;
  
      initialized = 1;
  
  
  
      /* hardware accelerators */
  
      REGISTER_HWACCEL(H263_VAAPI,        h263_vaapi);
  
      REGISTER_HWACCEL(H263_VIDEOTOOLBOX, h263_videotoolbox);
  
      ...

  I don’t understand why do these methods even get declared when my config has them set to 0

  #define CONFIG_H263_VAAPI_HWACCEL 0
  
  #define CONFIG_H263_VDPAU_HWACCEL 0
  
  #define CONFIG_H263_VIDEOTOOLBOX_HWACCEL 0
  
  ...

  Btw it builds OK when I use msys/make tooling.

• A *hot* Piwik Community Meetup 2015 !

  10 août 2015, par André Bräkling — Community

  Last weekend I arrived in Germany to attend the Piwik Community Meetup 2015 and now I am in Poland.

  The meetup was HOT in every sense ! Berlin temperatures reached 35 degrees (celsius), as I finally meet in person several long-time, dedicated Piwik community contributors.

  

  Meetup preparation in Berlin, photo by M. Zawadziński, licensed under CC-BY-SA 4.0

  Pictures from the meetup preparation sessions
  

  In the first leg of my trip I was in Berlin to meet Piwik community members to prepare for the 2015 annual Piwik community meetup. These are my notes taken during the meeting at the request of one of my colleagues. I also relayed live on Framasphère, Twitter and IRC.

  

  Community discussion at the meetup, photo by D.Czajka, licensed under CC-BY-SA 4.0

  More pictures from the Piwik meetup
  

  This was harder than I expected, as I took notes with my laptop, pictures with my phone, wrote live to social media (using the Android Diaspora Native Web App), and used my laptop to relay on IRC. Going forward this requires better preparation, I was glad I had a few links and pictures ready before hand but it really requires intense focus to achieve this. I am glad presenters were patient when I requested repeating some of the ideas they shared. I am also a bit disappointed not much happened in IRC.

  Two day preparation sessions

  The discussions and session we had during the two days prior to the meetup are available here.

  We gathered in rented apartments in Berlin, this reminded me very much of similar community gatherings and perhaps of BarCamp and, at a much smaller scale, UDS sessions.

  

  Piwik Pizza !, photo by F. Rodríguez, licensed under CC-BY-SA 4.0

  A list of ideas of topics was initially submitted, we then proceeded to have scheduled sessions for open discussion. Several people shared their concern there was no possible remote participation which led to making public the Trello boards used/linked here.

  Note : The Trello links below still have action items and notes that are pending bug report / feature requests filing which should happen over the coming weeks. Most importantly, many action items will need identifying leads for different community team including Translations and Documentation, and better coordination of coming community engagement.

  Monday sessions consisted of the following subjects :

  • What are Piwik values & how to communicate them ? (see below for details)
  • How to encourage and recognize new external contributors ?
  • How could we double the Piwik userbase ?
  • How Community can organise help resources

  On Tuesday we met again to discuss the following subjects :

  • Piwik Long Term support (LTS)
  • How do Piwik.org (project) and Piwik PRO (company) sit together / are organized ? – An important part of this session was about having better communication channels and improving the new team page (bug #8520 and bug #8519, respectively)
  • Improving usability of Piwik e.g. for new users – this last session was not held has we ran out of time and prepared to go to the meetup venue.

  Some more details about individual preparation sessions

  What are Piwik values & how to communicate them ?

  The main subjects in this session were important changes proposed in the project mission and values. This was edited directly on on the wiki page on GitHub, some of the changes can be seen by comparing revisions.

  Piwik mission statement (bug #7376)

  “To create the leading Free and open source analytics platform, and to support global organisations and communities to keep full control over their data.”

  Our values

  • Openness
  • Freedom
  • Transparency
  • Data ownership
  • Privacy
  • Kaizen (改善) : continuous improvement

  This was also presented by Matthieu Aubry at the meetup and is published in the Roadmap page. Bringing more visibility and perhaps having a top page for Mission and Values was also brought up.

  Meetup agenda and notes

  The official agenda is available here.

  Many Piwik PRO employees stayed in Berlin for the meetup, and we had good participation although less than last year in Munich as my colleagues told me. Some were consultants, others staff from public organizations, universities, etc. In retrospect considering the very hot weather and summer holidays the attendance was good. I was very happy to arrive at the beautiful Kulturbrauerei and enter the air-conditioned Soda Club. T-Shirts were waiting for all attendees and free drinks (non-alcohol !) were welcome

• configure : Support MSVC 2015

  5 juin 2015, par Luca Barbato

  configure : Support MSVC 2015
  The C runtime C99 compatibility had been improved a lot and it now
  
  rejects some of the compatibility defines provided for the older
  
  versions.
  Many thanks to Ray for the time spent testing.
  Bug-Id : 864
  
  CC : libav-stable@libav.org
  

  • [DH] configure
  • [DH] libavutil/internal.h