<div dir="ltr"><div dir="ltr">Hi,<div><br></div><div>I'm using libavfilter to detect black frame in my video. I followed this example <a href="https://ffmpeg.org/doxygen/3.4/filtering_video_8c-example.html">https://ffmpeg.org/doxygen/3.4/filtering_video_8c-example.html</a> , but this example doesn't shows how to print black frame detected duration, instead it prints out video frames. As of now, I have replaced </div><div><span class="gmail-keyword" style="font-size:13px;color:rgb(0,128,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">const</span><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)"> </span><span class="gmail-keywordtype" style="font-size:13px;color:rgb(96,64,32);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">char</span><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)"> *</span><a name="a0" style="font-size:13px;color:rgb(61,87,140);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)"></a><a class="gmail-code" href="https://ffmpeg.org/doxygen/3.4/filtering__video_8c.html#a84b31b94c024a45c4bcebd875a54e73d" style="font-size:13px;color:rgb(70,101,162);text-decoration-line:none;font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">filter_descr</a><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)"> = </span><span class="gmail-stringliteral" style="font-size:13px;color:rgb(0,32,128);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">"scale=78:24,transpose=cclock"</span><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">; to </span><span class="gmail-keyword" style="font-size:13px;color:rgb(0,128,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">const</span><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)"> </span><span class="gmail-keywordtype" style="font-size:13px;color:rgb(96,64,32);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">char</span><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)"> *</span><a name="a0" style="font-size:13px;color:rgb(61,87,140);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)"></a><a class="gmail-code" href="https://ffmpeg.org/doxygen/3.4/filtering__video_8c.html#a84b31b94c024a45c4bcebd875a54e73d" style="font-size:13px;color:rgb(70,101,162);text-decoration-line:none;font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">filter_descr</a><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)"> = </span><span class="gmail-stringliteral" style="font-size:13px;color:rgb(0,32,128);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">"blackdetect=d=2:pix_th=0.00"</span><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">;</span></div><div><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">in the code. </span></div><div><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)"><br></span></div><div><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">Thanks & regards,</span></div><div><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)">S.Venkateswaran</span></div><div><span style="font-size:13px;color:rgb(0,0,0);font-family:monospace,fixed;white-space:pre-wrap;background-color:rgb(251,252,253)"><br></span></div></div></div>