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Chapcast adds a Podcast chapters meta box in the editor where you can enter start times and titles. On the front end, visitors see the standard HTML5 audio player plus a list of chapters; clicking a chapter jumps to that position in the audio.
<ul>
<li>Audio URL is resolved automatically: Seriously Simple Podcasting episode file, first audio file attached to the post (upload in editor), Audio block / <code>[audio]</code> shortcode in content, or a manual override / media library picker in the meta box.</li>
<li>Shortcode <code>[chapcast_player]</code> for manual placement (otherwise the player is appended after the post content when chapters exist). The legacy tag <code>[spc_player]</code> is still registered for backward compatibility.</li>
<li>Settings screen under Settings → Podcast Chapters (help text + toggle automatic player placement).</li>
<li>Media Library (list view): Chapters column on audio files shows whether chapter rows are saved on the attachment.</li>
<li>Filters for developers: <code>chapcast_post_types</code>, <code>chapcast_audio_url</code>, <code>chapcast_append_player_to_content</code>.</li>
</ul>

Chapcast – Podcast Chapters

HTML5 podcast player with clickable chapters. SSP optional; works with uploads, the Audio block, or any resolved audio URL.

Hugh Lashbrooke

Jonathan Bossenger

Serhiy Zakharchenko

Craig Hewitt

<blockquote>
This plugin is an add-on for <a href="https://www.seriouslysimplepodcasting.com/" rel="nofollow ugc">Seriously Simple Podcasting</a> and requires at least v1.14.8 of Seriously Simple Podcasting in order to work.
</blockquote>
Seriously Simple Podcasting is great for getting your audio (or video) content out there and making it available for everyone to find, but often you want to add that little bit of extra value for your listeners by supplying them with a written transcript of your episodes. Sure – you can do this by pasting all the text in your episode content, or adding a manual link in there, but a more automated and altogether cleaner option would be really great. That is exactly what this plugin provides.
Simply upload your transcript file (in any format) just like you would upload your podcast audio/video file and the link to download the transcript will appear underneath the episode media player with the rest of your episode details.
** Primary Seriously Simple Transcripts Add-On Features **
<ul>
<li>Adds a new file upload field to your episodes for adding your transcript file</li>
<li>Adds a ‘Download transcript’ link alongside the rest of the episode details on your episodes</li>
<li>Adds a Gutenberg ‘Transcripts’ block</li>
<li>Adds an Elementor ‘Transcripts’ block</li>
<li>Adds a podcast:transcript tag to podcast RSS feeds</li>
</ul>
How to contribute
If you want to contribute to Seriously Simple Transcripts, you can <a href="https://gitlab.com/castos/Seriously-Simple-Transcripts" rel="nofollow ugc">fork the GitLab repository</a> – all pull requests will be reviewed and merged if they fit into the goals for the plugin.

Seriously Simple Transcripts

Add downloadable transcripts to your Seriously Simple Podcasting episodes.

Chapcast – Podcast Chapters vs Seriously Simple Transcripts