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bturkus 2017-06-29 15:12:42 -04:00 committed by Reto Kromer
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@ -1469,6 +1469,36 @@ foreach ($file in $inputfiles) {
</div>
<!-- ends QCTools Report (no audio) -->
<!-- Read/Extract EIA-608 Closed Captions -->
<span data-toggle="modal" data-target="#readeia608"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Read or extract EIA-608 (Line 21) closed captioning">Read/Extract EIA-608 Closed Captioning</button></span>
<div id="readeia608" class="modal fade" tabindex="-1" role="dialog">
<div class="modal-dialog modal-lg">
<div class="modal-content">
<div class="well">
<h3>Read/Extract EIA-608 (Line 21) closed captioning</h3>
<p><code>ffprobe -f lavfi -i movie=<i>input_file</i>,readeia608 -show_entries frame=pkt_pts_time:frame_tags=lavfi.readeia608.0.cc,lavfi.readeia608.1.cc -of csv > <i>input_file</i>.csv</code></p>
<p>This command uses FFmpeg's <a href="https://ffmpeg.org/ffmpeg-filters.html#readeia608" target="_blank">readeia608</a> filter to extract the hexidecimal values hidden within <a href="https://en.wikipedia.org/wiki/EIA-608" target="_blank">EIA-608 (Line 21)</a> Closed Captioning, outputting a csv file. For more information about EIA-608, check out Adobe's <a href="https://www.adobe.com/content/dam/Adobe/en/devnet/video/pdfs/introduction_to_closed_captions.pdf" target="_blank">Introduction to Closed Captions</a>.</p>
<p>If hex isn't your thing, closed captioning <a href="http://www.theneitherworld.com/mcpoodle/SCC_TOOLS/DOCS/CC_CHARS.HTML" target="_blank">character</a> and <a href="http://www.theneitherworld.com/mcpoodle/SCC_TOOLS/DOCS/CC_CODES.HTML" target="_blank">code</a> sets can be found in the documentation for SCTools.</p>
<dl>
<dt>ffprobe</dt><dd>starts the command</dd>
<dt>-f lavfi</dt><dd>tells ffprobe to use the Libavfilter input virtual device <a href="http://ffmpeg.org/ffmpeg-devices.html#lavfi" target="_blank">[more]</a></dd>
<dt>-i</dt><dd>input file and parameters</dd>
<dt>readeia608 -show_entries frame=pkt_pts_time:frame_tags=lavfi.readeia608.0.cc,lavfi.readeia608.1.cc -of csv</dt><dd>identifies the first two lines of EIA-608 data and outputs a csv file</dt>
<dt><code>></code></dt><dd>redirects the standard output (the data made by ffprobe about the video)</dt>
<dt><i>input_file</i>.csv</dt><dd>names the csv output file</dt>
</dl>
<div class="sample-image">
<h4>Example</h4>
<p>Side-by-side video with true EIA-608 captions on the left, zoom in on the right (with hex values represented). To achieve something similar with your own captioned video, try out the EIA608/VITC viewer in <a href="https://github.com/bavc/qctools" target="_blank">QCTools</a>.</p>
<img src="img/eia608.gif" alt="GIF of Closed Captions">
</div>
<p class="link"></p>
</div>
</div>
</div>
</div>
<!-- ends Read/Extract EIA-608 Closed Captions -->
</div>
<div class="well">
<h4>Test files</h4>