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<p class="MsoNormal">Hi libav users,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I’m trying to use BlackMagic Decklink Capture/Output cards with libav but I’ve got problem with avformat_open_input.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’m using the following ffmpeg wrapper project in C# (which works flawlessly with all libav functions but not using decklink input or output) :
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span lang="EN-US"><a href="https://github.com/Ruslan-B/FFmpeg.AutoGen">https://github.com/Ruslan-B/FFmpeg.AutoGen</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’ve compiled by myself a shared version of ffmpeg 2.8.5 with the decklink extra lib (also tried with git-37db3e8 from zeranoe) and run the following ffmpeg command and it was ok :
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> ffmpeg –f decklink –i “DeckLink SDI (1)@3” –pix_fmt yuv420p –f sdl “DeckLink Input”<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">But not using libav directly (“ffmpeg.” prefix before all libav functions is just a namespace created by “FFmpeg.Autogen” export) :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//I’ve alredy registrered libav functions<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;background:white;mso-highlight:white">AVFormatContext</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">*
dlk_in_ctx = </span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;background:white;mso-highlight:white">ffmpeg</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">.avformat_alloc_context();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">//this function is working well<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;background:white;mso-highlight:white">AVInputFormat</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">*
dlk_in_fmt = </span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;background:white;mso-highlight:white">ffmpeg</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">.av_find_input_format(</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#A31515;background:white;mso-highlight:white">"decklink"</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">);</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:blue;background:white;mso-highlight:white">if</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">
(dlk_in_fmt == </span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:blue;background:white;mso-highlight:white">null</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">{</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt;text-autospace:none"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:blue;background:white;mso-highlight:white">goto</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">
end;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">//this function return an error</span><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:blue;background:white;mso-highlight:white">if</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">
((ret = </span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;background:white;mso-highlight:white">ffmpeg</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">.avformat_open_input(&dlk_in_ctx,
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#A31515;background:white;mso-highlight:white">"DeckLink SDI (1)@3"</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">,
dlk_in_fmt, </span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:blue;background:white;mso-highlight:white">null</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">))
!= </span><span style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">0)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">{</span><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span style="font-size:9.5pt;font-family:Consolas;color:blue;background:white;mso-highlight:white">goto</span><span style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">
end;</span><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I always get an error code equals to -5 (don’t know how to get a description of the error code).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’ve search a lot on the web for a decklink example in C/C++ to adapt it in C# (like I did with transcoding and filtering without any problem), but could not find anything.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Did someone already tried this?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Can someone send an example on how to do it in a “normal way” (in C/C++)?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks for your comments,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Julien<o:p></o:p></span></p>
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