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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="#piping-data-to-packager">Piping data to packager</a></li>
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<li><a class="reference internal" href="#encoding-capture-command">Encoding / capture command</a><ul>
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<li><a class="reference internal" href="#camera-capture">Camera capture</a></li>
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<li><a class="reference internal" href="#rtp-input">RTP input</a></li>
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title="previous chapter">PlayReady</a></p>
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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, or rtp input. The concept
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depicted here can be applied to other <em>FFmpeg</em> supported device or protocols.</p>
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<div class="section" id="piping-data-to-packager">
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<h2>Piping data to packager<a class="headerlink" href="#piping-data-to-packager" title="Permalink to this headline">¶</a></h2>
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<p>There are two options to pipe data to packager.</p>
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<ul>
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<li><p class="first">UDP socket</p>
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<blockquote>
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<div><p><em>FFmpeg</em> supports writing to a UDP socket and <em>packager</em> supports reading
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from UDP sockets:</p>
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<div class="highlight-default"><div class="highlight"><pre><span></span>$ packager 'input=udp://127.0.0.1:40000,...' ...
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$ ffmpeg ... -f mpegts udp://127.0.0.1:40000
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</pre></div>
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</div>
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<p>VP9 cannot be carried in mpegts. Another container, e.g. webm needs to be
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used when outputs VP9. In this case, transcoding has to be started after
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starting packager as the initialization segment is only transmitted in the
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beginning of WebM output.</p>
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</div></blockquote>
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</li>
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<li><p class="first">pipe</p>
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<blockquote>
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<div><p>Similarily, pipe is also supported in both <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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$ packager 'input=pipe1,...' ... --io_block_size 65536
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$ ffmpeg ... -f mpegts pipe: > pipe1
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</pre></div>
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</div>
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</div></blockquote>
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</li>
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</ul>
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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 when using pipe as reading from pipe
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blocks until the specified number of bytes, which is specified in
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io_block_size for threaded io file, thus the value of io_block_size cannot
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be too large.</p>
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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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<div class="section" id="camera-capture">
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<h3>Camera capture<a class="headerlink" href="#camera-capture" title="Permalink to this headline">¶</a></h3>
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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 example assumes Mac OS X 10.7 (Lion) or later. It captures from the default
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audio / video devices on the machine:</p>
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<div class="highlight-default"><div class="highlight"><pre><span></span>$ ffmpeg -f avfoundation -i "default" -f mpegts udp://127.0.0.1:40000
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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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2017-10-24 22:51:02 +00:00
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<div class="section" id="rtp-input">
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<h3>RTP input<a class="headerlink" href="#rtp-input" title="Permalink to this headline">¶</a></h3>
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<p>Assume there is an RTP input described by <cite>saved_sdp_file</cite>:</p>
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<div class="highlight-default"><div class="highlight"><pre><span></span>$ ffmpeg -protocol_whitelist "file,rtp,udp" -i saved_sdp_file -vcodec h264 \
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-tune zerolatency -f mpegts udp://127.0.0.1:40000
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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>For testing, you can generate an RTP input from a static media file:</p>
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<div class="last highlight-default"><div class="highlight"><pre><span></span>$ ffmpeg -re -stream_loop 100 -i <static.mp4> -vcodec copy -acodec \
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copy -f rtp rtp://239.255.0.1:1234 -sdp_file saved_sdp_file
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</pre></div>
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</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 or above. If not, adjust the encoding parameters to increase it.</p>
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</div>
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</div>
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</div>
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<div class="section" id="example-packaging-command-in-dash">
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<h2>Example packaging command in DASH<a class="headerlink" href="#example-packaging-command-in-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=udp://127.0.0.1:40000,stream=audio,init_segment=live_cam_audio.mp4,segment_template=live_cam_audio_$Number$.m4s' \
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'in=udp://127.0.0.1:40000,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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</pre></div>
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