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Fix HTML, some typos and improve some explanations. Thanks for review.
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Basti Becker 2017-10-12 12:49:35 +02:00
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<div class="well">
<h3>Record and Live-Stream simultaneously</h3>
<p><code>ffmpeg -re -i <i>${INPUTFILE}</i> -map 0 -flags +global_header -vf scale="1280:-1,format=yuv420p" -pix_fmt yuv420p -level 3.1 -vsync passthrough -crf 26 -g 50 -bufsize 3500k -maxrate 1800k -c:v libx264 -c:a aac -b:a 128000 -r:a 44100 -ac 2 -t ${STREAMDURATION} -f tee <i>"[movflags=+faststart]${TARGETFILE}|[f=flv]${STREAMTARGET}"</i></code></p>
I use this script to stream to a RTMP target and record the stream locally as .mp4 with only one ffmpeg-instance.<br />
As input, I use <code>bmdcapture</code> which is piped to ffmpeg. But it can also be used with a static videofile as input.<br />
The input will be scaled to 1280px width, maintaining height. Also the stream will stop after a given time (see <code>-t</code> option.)</p>
<p><strong>Note 1</strong><br />
I recommend to use this inside a shell script. then you can define the variables <code>${INPUTFILE}</code>, <code>${STREAMDURATION}</code>, <code>${TARGETFILE}</code>, <code>${STREAMTARGET}</code>.</p>
<p><strong>Note 2</strong><br />
This is in daily use to live-stream a real-world TV show. No errors for nearly 4 years. Some parameters were found by trial-and-error or empiric testing. So suggestions / questions are welcome.</p>
<p>I use this script to stream to a RTMP target and record the stream locally as .mp4 with only one ffmpeg-instance.</p>
<p>As input, I use <code>bmdcapture</code> which is piped to ffmpeg. But it can also be used with a static videofile as input.</p>
<p>The input will be scaled to 1280px width, maintaining height. Also the stream will stop after a given time (see <code>-t</code> option.)</p>
<h4>Notes</h4>
<ol>
<li>I recommend to use this inside a shell script. then you can define the variables <code>${INPUTFILE}</code>, <code>${STREAMDURATION}</code>, <code>${TARGETFILE}</code>, <code>${STREAMTARGET}</code>.</li>
<li>This is in daily use to live-stream a real-world TV show. No errors for nearly 4 years. Some parameters were found by trial-and-error or empiric testing. So suggestions / questions are welcome.</li>
</ol>
<dl>
<dt>/usr/local/bin/ffmpeg </dt><dd>starts the command</dd>
<dt>ffmpeg </dt><dd>starts the command</dd>
<dt>-re </dt><dd>Read input at native framerate</dd>
<dt>-i input.mov </dt><dd>The input file. Can also be a <code>-</code> to use STDIN if you pipe in from webcam or SDI.</dd>
<dt>-map 0 </dt><dd>map ALL streams from input file to output</dd>
<dt> -flags +global_header </dt><dd>Dont place extradata in every keyframe</dd>
<dt>-flags +global_header </dt><dd>Don't place extra data in every keyframe</dd>
<dt>-vf scale="1280:-1" </dt><dd>Scale to 1280 width, maintain aspect ratio.</dd>
<dt> -pix_fmt yuv420p </dt><dd>convert to 420p color space</dd>
<dt>-pix_fmt yuv420p </dt><dd>convert to 420p chroma subsampling scheme</dd>
<dt>-level 3.1 </dt><dd>H264 Level (defines some thresholds for bitrate)</dd>
<dt>-vsync passthrough </dt><dd>Each frame is passed with its timestamp from the demuxer to the muxer.</dd>
<dt>-crf 26 </dt><dd>Constant rate factor - basically the quality</dd>
<dt>-g 50 </dt><dd>GOP size.</dd>
<dt>-bufsize 3500k </dt><dd>Ratecontrol buffer size (~ maxrate x2)</dd>
<dt>-maxrate 1800k </dt><dd>Maximum bit rate</dd>
<dt> -c:v libx264 </dt><dd>The video codec</dd>
<dt> -c:a aac </dt><dd>The audio codec</dd>
<dt>-c:v libx264 </dt><dd>encode output video stream using H.264</dd>
<dt>-c:a aac </dt><dd>encode output audio stream using AAC</dd>
<dt>-b:a 128000 </dt><dd>The audio bitrate</dd>
<dt>-r:a 44100 </dt><dd>The audio samplerate</dd>
<dt>-ac 2 </dt><dd>Two audio channels</dd>