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explains difference between streaming w ffplay and saving w ffmpeg

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Ashley Blewer 2017-12-03 11:52:51 -05:00
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</div>
<!-- End Basic structure of an FFmpeg command -->
<!-- Streaming vs. Saving -->
<label class="recipe" for="streaming-saving">Streaming vs. Saving</label>
<input type="checkbox" id="streaming-saving">
<div class="hiding">
<h3>Streaming vs. Saving</h3>
<p>FFplay allows you to stream created video and FFmpeg allows you to save video.</p>
<p>The following command creates and saves a 10-second video of SMPTE bars:</p>
<code>ffmpeg -f lavfi -i smptebars=size=640x480 -t 5 output_file</code>
<p>This command plays and streams SMPTE bars but does not save them on the computer:</p>
<code>ffplay -f lavfi smptebars=size=640x480</code>
<p>The main difference is small but significant: the <code>-i</code> flag is required for FFmpeg but not required for FFplay. Additionally, the FFmpeg script needs to have <code>-t 5</code> and <code>output.mkv</code> added to specify the length of time to record and the place to save the video.</p>
<p class="link"></p>
</div>
<!-- End Streaming vs. Saving -->
</div>
<div class="well">
<h2 id="concepts">Learn about more advanced FFmpeg concepts</h2>