How to get a YouTube thumbnail from a YouTube iframe?

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暗喜 2021-01-30 09:00
For instance I have a blog post that has the following iframe.
</script>
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                <span>(楼主)</span>
            
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                <span>2021-01-30 09:40</span>
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<p><strong>Get Youtube thumbnail images using below urls</strong></p>

<p><strong>Low quality</strong></p>

<pre><code> https://img.youtube.com/vi/[video-id]/sddefault.jpg
</code></pre>

<p><strong>medium quality</strong></p>

<pre><code> https://img.youtube.com/vi/[video-id]/mqdefault.jpg
</code></pre>

<p><strong>High quality</strong></p>

<pre><code>http://img.youtube.com/vi/[video-id]/hqdefault.jpg
</code></pre>

<p><strong>maximum resolution</strong></p>

<pre><code>http://img.youtube.com/vi/[video-id]/maxresdefault.jpg
</code></pre>

<p>example: https://img.youtube.com/vi/OYr-KPboPDw/hqdefault.jpg</p>
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