How to Make an AI Podcast Clip Generator With Castmagic

There are a range of AI podcast clip generator tools on the market that claim to generate short clips and viral videos from podcast episodes.

After trying a number of these tools out, I’ve found that they’re quite underwhelming – the majority of them generating mediocre content at best.

In this guide, I’ll show you how to use two separate AI tools as an AI podcast clip generator that actually generates incredible content.

And don’t worry, it’s simple and free to get started.

Don’t believe me? Here’s a sample of an AI podcast clip I made using this method. From the time I found the full clip on YouTube, it took about 10 minutes and took no editing or previous skills.

How to Make an AI Podcast Clip Generator

The main title of this article should be How to Make an AI Podcast Clip Generator With Castmagic AND Submagic… but that’s too long for Google.

Here’s a quick rundown of exactly what we’ll do.

  1. Find a podcast episode we want to make clips from

  2. Identify viral podcast clips using Castmagic

  3. Clip your long form video

  4. Create the final podcast clips using Submagic

The good news is, both these AI tools have free plans to get you started.

Let’s begin! 👇

1. Find Your Podcast Episode on YouTube

First things first we want to find podcast episodes to use for our engaging podcast clips.

The best place to do this is YouTube as we’ll needing both the audio and video clips from the episode.

For this tutorial, I’m going to use the following Joe Rogan podcast clip from the JRE Clips channel.

You can use full episodes, but usually these short video clips are enough!

2. Identify Podcast Clips Automatically

Once you’ve found your podcast episodes, head over to Castmagic and sign up.

You get 300 minutes of free audio when you sign up to Castmagic which is a very generous free plan to get you started. You will need a credit card to sign up to prevent misuse of the tool.

Transcribe Your Podcast Clip

Getting started with Castmagic is simple. Once you’re in click Import audio or video in the top right hand corner and paste the YouTube URL of your podcast episode.

Castmagic will automatically begin processing your video and you’ll receive an email when it’s completed (Sometimes it can take a while on the free plan).

Assign Speakers to the Transcript

Once your clip is processed, click it to enter the Transcript tab. Click the Speakers button in the upper right and assign names to the speakers in the video.

Labeling speakers in the Castmagic Transcript user interface

Create a Podcast Clip Generator Prompt

When you’re happy with the transcript we want to input a custom prompt that Castmagic will use to generate suggested podcast clips each time you upload a video.

Click the AI Content tab in Castmagic and scroll to the bottom of the page, click New custom prompt.

There are 3 fields in the custom prompt popup that appears: Name, Prompt, and Content sample.

Generating a custom prompt in the Castmagic AI Content user interface

Copy over the following prompts in the appropriate fields:


🎞️ Podcast Clip Generator



Identify key conversations, comments, stories, or moments from the podcast transcript that have the highest potential to go viral on short-form media feeds. Each selected clip should be under 50 seconds in length.


Engaging Content: Focus on moments that are emotionally engaging, thought-provoking, humorous, or controversial. These should capture the audience's attention quickly and leave a strong impression.

Conciseness: Ensure each selected clip is concise and self-contained, providing enough context within the 50-second limit to be understandable and impactful.

Justification: Provide a clear and concise justification for why each clip has high viral potential. Consider the following factors:

Emotional Impact: Does the clip evoke strong emotions (e.g., laughter, surprise, inspiration)?

Relatability: Is the content relatable to a broad audience?

Uniqueness: Does the clip offer a unique perspective or story that stands out?

Trend Alignment: Does the content align with current trends or popular topics on social media?

Shareability: Is the clip likely to be shared due to its content, message, or the personality of the speaker?


Use the above guidelines to scan through the podcast transcript, identifying and extracting clips that fit the criteria. Provide the timestamp, clip description, and justification for each selected clip.

Content sample

Example Outputs

Timestamp: 10:15 - 10:45

Clip Description: Host shares a hilarious anecdote about a travel mishap involving a mix-up at an international airport.

Justification: The clip has high potential to go viral due to its humor and relatability. Many people have experienced travel mishaps, making it easy to connect with and share.

Timestamp: 35:20 - 35:50

Clip Description: Guest discusses a transformative life lesson learned during a challenging period.

Justification: This clip is emotionally impactful and inspirational, making it highly shareable. It aligns with current trends of motivational content on social media.

Timestamp: 58:05 - 58:40

Clip Description: Host and guest debate a controversial topic with opposing viewpoints.

Justification: The clip’s controversial nature and dynamic exchange can spark discussions and debates, increasing its virality potential.

Click Save custom prompt

3. Identify Engaging Clips

Upon clicking Save custom prompt, Castmagic will automatically get to work generating ideas for viral short form video clips.

Read through them and identify which clip you want to use – note the timestamps of the clips you like.

If you want more suggestions, click Modify and enter the custom modification prompt: Give me 10 more examples.

Here’s a sample of what Castmagic generated from the JRE Clip I provided:

Example of the custom prompt output for AI podcast clips in Castmagic

4. Clip Your Long Form Video

Now we need to clip down the long form video into manageable podcast clips using the timestamps from step 3.

Download the YouTube video to your computer using a YouTube to mp4 converter (just search Google for one and be careful you’re not downloading any malicious files).

Once downloaded you can use a free online tool for clipping your video.

I prefer to clip the video in CapCut and change the aspect ratio to 9:16 while I’m there (CapCut is a free video editing app that’s super simple to use).

5. Generate Podcast Clips Automatically

Now this is the fun part – creating the short form video clips with Submagic.

Head over to Submagic and sign up. They offer a free plan with watermarks to get you started.

Upload Your Clip

Upload your video clip to Submagic – it’s will automatically transcribe your content.

Modify Style Settings

Once your clip is uploaded, choose the style of captions you like in the Style tab. These can be changed as the video is playing.

Submagic Style User-Interface Settings and Options

Here you can also change the Color, Size, Y Position, and Highlight Colors of your captions.

Check Captions

Click the Captions tab and make any fixes to your captions. You can see specific words the AI wasn’t sure about highlighted in red.

You can also change Emojis here or delete them altogether from your captions.

Add B-Roll and Transitions

Click over to the B-Rolls section to add transitions, b-roll video, and images to your podcast clip.

Trim Silences

Click the Trim tab to remove silences and filler words from your podcast audio.

Generate Titles, Hashtags, and Add Music

Finally, click over to the Boost tab to generate

AI Podcast Clip Generator Results

Here’s 2 clips I generated from the JRE Clips video straight from YouTube.

From start to finish these took me just over 15 minutes!

Clip 1: Bare Minimum

These captions were 100% generated by Submagic.

I uploaded the video to Submagic, chose DEVIN, and clicked export.

Pretty neat right?

Clip 2: Add B-Roll + Transitions

This clip I added some b-roll and scene transitions to boost engagement and make the video look way more professional.

Wrapping Up

Today I showed you how to make an AI podcast clip generator using two separate AI tools – Castmagic and Submagic.

Using these powerful AI content automation tools together has some amazing results and requires literally no editing skills.

If you’re looking to create clips for YouTube Shorts or TikTok but don’t have the time to watch hours of podcasts or learn video editing, this is the guide for you.

Hopefully you can go viral with this guide!

Tag me on Instagram @mattybrahhh with your creations!

Peace. ✌️

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