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• avcodec_encode_video2 crash on MinGW32 (but not on MinGW64)

  27 février 2018, par ksb496

  I have been testing for years a software that I am developing, compiled only for 64-bit systems through Qt-MinGW64, without experiencing any kind of issue regarding video encoding (which is one of the features of such application). Recently, I have been attempting to build the corresponding x86 version of my software by compiling it with Qt-MingGW32.

  However, after bulding the same ffmpeg and x264 library versions to create the 32-bit versions and successfully linking them to my project, the application keeps crashing after few frames are encoded, due to segmentation fault error. This is very strange because, as I indicated before, it works flawlessly when compiled for 64-bit systems.

  I have also lost a considerable amount hours trying to combine a big amount of different versions of both ffmpeg and x264 libraries, but with no luck either. Neither it works when disabling threads both for x264 and ffmpeg libraries, hence it does not seem to be a win32 threading issue. Therefore, I have concluded that the error is most likely in my code, which by some chance beyond my comprehension tells ffmpeg to allocate the right amount of memory in the x64 version, but not in the x86 version.

  It must be pointed out also that before the avcodec_encode_video2 call, I do the following calls, among others, in order to allocate the memory associated to the corresponding items (AVFrame, AVCodec, etc.), such as

  avcodec_open2( my_codec_context, my_codec, &opt );
  
  my_av_frame=av_frame_alloc();

  More precisely, the details involving the code structure that I am using can be found here.

  Therefore, the error appears to be more subtle than just issues regarding uninitialized memory.

  Many thanks in advance.

  UPDATE :

  I have discovered the focus of the problem. For some reason, FFmpeg/x264 libraries behave abnormally in Win32 GUI applications compiled with Qt-MinGW32, while they run correctly in Win32 console applications, also compiled with Qt-WinGW32. I have proven this claim performing two dummy tests, in which the exact same piece of code is run through a console application and on a GUI application, succeeding in the first case and failing in the latter one. The code for such tests can be found below, along with the x264 and FFmpeg libraries used in my projects, together with instructions to build them in msys2 with MinGW32 :

  https://takeafile.com/?f=hisusinivi

  I have no idea whether it can be solved by simply tweaking the code or it is a serious bug involving an incompatibility issue. If it is the latter, should it be reported to the Qt/FFmpeg/x264 staff as a major bug ?

• aacenc : use the fast coder as the default

  13 janvier 2018, par Rostislav Pehlivanov

  aacenc : use the fast coder as the default
  The twoloop coder sounds decent at low bitrates, however at higher bitrates
  
  it sounds worse than the fast coder (which used to be the old twoloop coder
  
  before October 2015) and needs quite a lot more CPU.
  
  Change the default to fast. It has been well tested and has had little changes
  
  over the years so its been confirmed to be quite stable.
  
  Also change its description (not valid for more than a year) and the
  
  documentation.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] doc/encoders.texi
  • [DH] libavcodec/aacenc.c
  • [DH] tests/fate/aac.mak

• Anomalie #4074 : Le code de plugin-dist/medias/modeles/video.html , produit un paragraphe de trop ...

  11 janvier 2018, par eldk -

  Code de base produit par SPIP
  
  
  
  
  
  
  Extrait video&nbsp ; : sens de la vie - Monthy Python - 1983 - Universal
  &lt;script&gt;/*&lt;![CDATA[*/var mejspath='plugins-dist/medias/lib/mejs/mediaelement-and-player.min.js?1508951836',mejscss='plugins-dist/medias/lib/mejs/mediaelementplayer.min.css?1508951836';<br />
  
  var mejsloader; (function(){var a=mejsloader;&quot;undefined&quot;==typeof a&amp;#38;&amp;#38;(mejsloader=a={gs:null,plug:{},css:{},init:null,c:0,cssload:null});a.init||(a.cssload=function(b){if(&quot;undefined&quot;==typeof a.css[b]){a.css[b]=!0;var c=document.createElement(&quot;link&quot;);c.href=b;c.rel=&quot;stylesheet&quot;;c.type=&quot;text/css&quot;;document.getElementsByTagName(&quot;head&quot;)[0].appendChild(c)}},a.init=function(){!0===a.gs&amp;#38;&amp;#38;function(b){jQuery(&quot;audio.mejs,video.mejs&quot;).not(&quot;.done&quot;).each(function(){function c(){var e=!0,h;for(h in d.css)a.cssload(d.css[h]);for(var f in d.plugins)&quot;undefined&quot;== typeof a.plug[f]?(e=!1,a.plug[f]=!1,jQuery.getScript(d.plugins[f],function(){a.plug[f]=!0;c()})):0==a.plug[f]&amp;#38;&amp;#38;(e=!1);e&amp;#38;&amp;#38;new MediaElementPlayer(&quot;#&quot;+b,jQuery.extend(d.options,{success:function(a){function b(){jQuery(a).closest(&quot;.mejs-inner&quot;).removeClass(a.paused?&quot;playing&quot;:&quot;paused&quot;).addClass(a.paused?&quot;paused&quot;:&quot;playing&quot;)}b();a.addEventListener(&quot;play&quot;,b,!1);a.addEventListener(&quot;playing&quot;,b,!1);a.addEventListener(&quot;pause&quot;,b,!1);a.addEventListener(&quot;paused&quot;,b,!1);g.attr(&quot;autoplay&quot;)&amp;#38;&amp;#38;a.play()}}))}var g=jQuery(this).addClass(&quot;done&quot;), b;(b=g.attr(&quot;id&quot;))||(b=&quot;mejs-&quot;+g.attr(&quot;data-id&quot;)+&quot;-&quot;+a.c++,g.attr(&quot;id&quot;,b));var d={options:{},plugins:{},css:[]},e,h;for(e in d)if(h=g.attr(&quot;data-mejs&quot;+e))d[e]=jQuery.parseJSON(h);c()})}(jQuery)});a.gs||(&quot;undefined&quot;!==typeof mejscss&amp;#38;&amp;#38;a.cssload(mejscss),a.gs=jQuery.getScript(mejspath,function(){a.gs=!0;a.init();jQuery(a.init);onAjaxLoad(a.init)}))})();/*]]&gt;*/&lt;/script&gt;
  

  
  
  
  
  
  
  Extrait video&nbsp ; : sens de la vie - Monthy Python - 1983 - Universal
  &lt;script&gt;/*&lt;![CDATA[*/var mejspath='plugins-dist/medias/lib/mejs/mediaelement-and-player.min.js?1508951836',mejscss='plugins-dist/medias/lib/mejs/mediaelementplayer.min.css?1508951836';<br />
  
  var mejsloader; (function(){var a=mejsloader;&quot;undefined&quot;==typeof a&amp;#38;&amp;#38;(mejsloader=a={gs:null,plug:{},css:{},init:null,c:0,cssload:null});a.init||(a.cssload=function(b){if(&quot;undefined&quot;==typeof a.css[b]){a.css[b]=!0;var c=document.createElement(&quot;link&quot;);c.href=b;c.rel=&quot;stylesheet&quot;;c.type=&quot;text/css&quot;;document.getElementsByTagName(&quot;head&quot;)[0].appendChild(c)}},a.init=function(){!0===a.gs&amp;#38;&amp;#38;function(b){jQuery(&quot;audio.mejs,video.mejs&quot;).not(&quot;.done&quot;).each(function(){function c(){var e=!0,h;for(h in d.css)a.cssload(d.css[h]);for(var f in d.plugins)&quot;undefined&quot;== typeof a.plug[f]?(e=!1,a.plug[f]=!1,jQuery.getScript(d.plugins[f],function(){a.plug[f]=!0;c()})):0==a.plug[f]&amp;#38;&amp;#38;(e=!1);e&amp;#38;&amp;#38;new MediaElementPlayer(&quot;#&quot;+b,jQuery.extend(d.options,{success:function(a){function b(){jQuery(a).closest(&quot;.mejs-inner&quot;).removeClass(a.paused?&quot;playing&quot;:&quot;paused&quot;).addClass(a.paused?&quot;paused&quot;:&quot;playing&quot;)}b();a.addEventListener(&quot;play&quot;,b,!1);a.addEventListener(&quot;playing&quot;,b,!1);a.addEventListener(&quot;pause&quot;,b,!1);a.addEventListener(&quot;paused&quot;,b,!1);g.attr(&quot;autoplay&quot;)&amp;#38;&amp;#38;a.play()}}))}var g=jQuery(this).addClass(&quot;done&quot;), b;(b=g.attr(&quot;id&quot;))||(b=&quot;mejs-&quot;+g.attr(&quot;data-id&quot;)+&quot;-&quot;+a.c++,g.attr(&quot;id&quot;,b));var d={options:{},plugins:{},css:[]},e,h;for(e in d)if(h=g.attr(&quot;data-mejs&quot;+e))d[e]=jQuery.parseJSON(h);c()})}(jQuery)});a.gs||(&quot;undefined&quot;!==typeof mejscss&amp;#38;&amp;#38;a.cssload(mejscss),a.gs=jQuery.getScript(mejspath,function(){a.gs=!0;a.init();jQuery(a.init);onAjaxLoad(a.init)}))})();/*]]&gt;*/&lt;/script&gt;