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• Compile FFmpeg Zeranoe Build with Visual Studio 2013

  19 janvier 2016, par mFeinstein

  I downloaded the most recent Zeranoe dev build here, included the header files to my code, placed extern "C" around the includes, since this is a C++ project and FFmpeg is a C library, and added the libs to Visual Studio as well, and I get this linker error :

  1>Camera.obj : error LNK2019 : unresolved external symbol _av_free referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_freep referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_frame_alloc referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_frame_free referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_register_all referenced in function __catch$ ??0Camera@MicroDFV_Camera@@QAE@V ?$basic_string@DU ?$char_traits@D@std@@V ?$allocator@D@2@@std@@0PAX@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_alloc_context3 referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_open2 referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_close referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_init_packet referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_packet_unref referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_find_encoder referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_encode_video2 referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_opt_set referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_image_alloc referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>M :\Desktop\OpenCVTest\Debug\OpenCVTest.exe : fatal error LNK1120 : 14 unresolved externals

  Searching here and on Google I found many recommendations, such as to add #pragma comment(lib,...), and that the libs are static, so their order is important, and none of this helps.

  So I scratched my head even more and realized that the Zeranoe build is made with MinGW-w64, so probably it won’t link with Visual Studio. I inspected the lib using dumpbin and the symbols on the libs don’t have the underscore, so I am pretty sure it won’t work.

  The other Zeranoe builds for Windows don’t have libs, they are just plain .exe or exe + .dll.

  Will I have to make my own VS2013 build of FFmpeg to link it, or is there some alternative way ?

• How to upload files to Azure Blob Stotage like FTP ?

  25 janvier 2016, par CG-Guy

  I am able to upload files from my ffmpeg app to an FTP using this path :

  ftp://[user:password]@server[:port]/MyFolder/video/video.flv

  How do I achieve the same thing in Azure Blob ? I have tried this path :

  https://[account-name].blob.core.windows.net/video/video.flv /DestKey:[account-storage-key]

  But that doesn’t seem to work. TCP connection shows the app is making a connection with the Azure account to the remote address 104.208.XXX.XX and remote port 443. However, it drops the connection and starts attempts to reconnect repeatedly. It will then time out after countless attempts and crash the app. I have also tried /> without success. The same thing happens. It attempts connecting to the remote address and port 80.

  The FFMPEG app has full access to firewall ports and the app communication shell show files are published without errors. System is a Server 2008 R2 unit on-site, not VM.

• How to use ffmpeg and javascript for user to add input box inside of a video

  23 janvier 2016, par Donalda Donalda

  I work on my website and the problem i faces is that i cant find a working way to get the chance for a user to drag an input box and set it into video specifying duration for the item.

  so i have a video and a textbox and my problem is when i grag the box i want it to stck to the video and stay there.

  Code is here :

      
  
      
  
      
  
      <code class="echappe-js">&lt;script&gt;<br />
  
          function allowDrop(ev) {<br />
  
              ev.preventDefault();<br />
  
          }<br />
  
  <br />
  
          function drag(ev) {<br />
  
              ev.dataTransfer.setData(&quot;text&quot;, ev.target.id);<br />
  
          }<br />
  
  <br />
  
          function drop(ev) {<br />
  
              ev.preventDefault();<br />
  
              var data = ev.dataTransfer.getData(&quot;text&quot;);<br />
  
              ev.target.appendChild(document.getElementById(data));<br />
  
          }<br />
  
      &lt;/script&gt;