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<h3><a href="../index.html">Table Of Contents</a></h3>
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<ul>
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<li><a class="reference internal" href="#">ffmpeg piping</a><ul>
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<li><a class="reference internal" href="#ffmpeg-camera-capture">ffmpeg camera capture</a></li>
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<li><a class="reference internal" href="#create-pipe">Create pipe</a></li>
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<li><a class="reference internal" href="#encoding-capture-command">Encoding / capture command</a></li>
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<div class="section" id="ffmpeg-piping">
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<h1>ffmpeg piping<a class="headerlink" href="#ffmpeg-piping" title="Permalink to this headline">¶</a></h1>
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<p>We can use <em>ffmpeg</em> to redirect / pipe input not supported by <em>packager</em>
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to <em>packager</em>, for example, input from webcam devices. The example below uses
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webcam input device. The concept depicted here can be applied to
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other <em>ffmpeg</em> supported capture device.</p>
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<div class="section" id="ffmpeg-camera-capture">
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<h2>ffmpeg camera capture<a class="headerlink" href="#ffmpeg-camera-capture" title="Permalink to this headline">¶</a></h2>
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<p>Refer to <a class="reference external" href="https://trac.ffmpeg.org/wiki/Capture/Webcam">ffmpeg Capture/Webcam</a>
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on how to use <em>ffmpeg</em> to capture webmcam inputs.</p>
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<p>The examples below assumes Mac OS X 10.7 (Lion) or later. It is similar on
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other platforms. Refer to the above link for details.</p>
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</div>
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<div class="section" id="create-pipe">
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<h2>Create pipe<a class="headerlink" href="#create-pipe" title="Permalink to this headline">¶</a></h2>
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<p>We use pipe to connect <em>ffmpeg</em> and <em>packager</em>:</p>
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<div class="highlight-default"><div class="highlight"><pre><span></span>$ mkfifo pipe1
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</pre></div>
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</div>
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</div>
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<div class="section" id="encoding-capture-command">
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<h2>Encoding / capture command<a class="headerlink" href="#encoding-capture-command" title="Permalink to this headline">¶</a></h2>
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<p>The below command captures from the default audio / video devices on the
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machine:</p>
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<div class="highlight-default"><div class="highlight"><pre><span></span>$ ffmpeg -f avfoundation -i "default" -f mpegts pipe: > pipe1
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</pre></div>
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</div>
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<p>The command starts only after packager starts.</p>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">After encoding starts, monitor encoding speed carefully. It should always be
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1x and above. If not, adjust the encoding parameters to recude it.</p>
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</div>
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</div>
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<div class="section" id="packaging-command-dash">
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<h2>Packaging command (DASH)<a class="headerlink" href="#packaging-command-dash" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-default"><div class="highlight"><pre><span></span>$ packager \
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'in=pipe1,stream=audio,init_segment=live_cam_audio.mp4,segment_template=live_cam_audio_$Number$.m4s' \
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'in=pipe1,stream=video,init_segment=live_cam_video.mp4,segment_template=live_cam_video_$Number$.m4s' \
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--mpd_output live_cam.mpd \
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--io_block_size 65536
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</pre></div>
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</div>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">Option -io_block_size 65536 tells packager to use an io_block_size of 65K
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for threaded io file. This is necessary as reading from pipe blocks until
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the specified number of bytes, which is specified in io_block_size for
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threaded io file, thus the value of io_block_size cannot be too large.</p>
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</div>
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<h3>Navigation</h3>
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<ul>
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<li class="right" style="margin-right: 10px">
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>index</a></li>
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>previous</a> |</li>
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