Most AI video generator comparisons are about the model. For TikTok the model is rarely what breaks. What breaks is the file and everything after it: the wrong aspect, text under the interface, muddy audio, and a workflow that ends with an MP4 nobody posts. Here is what a generator has to get right, from prompt to post.
Clip generator or video generator#
A text-to-video model gives you a few seconds of footage. A short-form video needs much more: a hook, a script, several scenes, a voiceover, captions, music and a vertical render. If you start from a clip model, you do the rest by hand.
A full AI video generator does the whole chain. In Looptake you describe the video you want in one sentence. It writes the hook and script, picks a viral format, builds the visuals from AI clips, AI images, stock footage or an AI avatar, adds a voiceover, word-timed animated captions and music, and renders at 9:16. Each video gets a viral score, and you can change any scene before you post.
The output spec#
Resolution and aspect ratio#
Render natively at 1080 by 1920, 9:16. Not a horizontal video with bars, not 4:5 padded. Above 1080 wide buys nothing that survives TikTok’s re-encode.
If your source is horizontal, build a vertical layout around it: crop to the subject, or stack the clip with text above and below. A 16:9 clip fitted to a vertical frame fills only about a third of the height, and it reads instantly as content made for somewhere else.
Frame rate#
30 fps suits text, cuts and slow pushes, which is most short-form. Use 60 only for real motion such as gameplay or sport. Keep one frame rate through the whole video. Mixing 24 fps stock into a 30 fps render causes judder on every pan.
Length#
TikTok accepts long videos. It rewards videos that keep earning attention. Most brand shorts work best when they make one point and stop. If the last second does no work, cut it.
Audio#
Mix for a phone speaker in a noisy room. Keep the voice well above the music, avoid wide stereo, and do not leave silence before the first word.
Text safe zones#
TikTok draws its caption, handle and sound strip over the bottom, buttons down the right, and navigation at the top. Keep text between 8 and 92 percent across and between 12 and 80 percent down. A good generator places text and captions there by default. How to add captions to short videos has the full caption settings.
File#
H.264 in an MP4 with AAC audio. Keep the master. Never re-upload a file downloaded from TikTok, because it carries a watermark.
Consistency matters at volume#
Short-form runs on volume, and volume runs on templates. A template only helps if the same input gives the same result. Otherwise the approved version is not the posted version, and you cannot compare two variants to learn what changed between a winner and a loser. Look for brand settings you set once (logo, colours, fonts, voice, caption style, outro) that apply to every video.
The five stages around generation#
Generation is one stage. The others decide whether you post daily.
1. Brand context#
Without it, ten videos describe your product ten slightly different ways. A generator should read a source of truth, such as your website or a brand kit, and let you edit it once rather than re-prompt every time. Looptake can build videos from a website URL so they match your brand.
2. Review#
At one post a day on three platforms you review about 30 videos a month, and more drafts than that. You need a queue with an order, a status and a recorded decision. Make more drafts than you need and reject freely. If you keep most of them, your bar is too low.
Use any score as a sort key, not a forecast. A viral score helps you pick which draft to look at first. It does not promise views.
3. Scheduling as a cadence#
A calendar is something you keep filling. A cadence is a rule: posts per day, which days, which times, which accounts. The system fills every slot and asks you to review the next batch. Automations in Looptake work this way. Keep the posting times your own decision, based on when your audience is awake and when you can reply to comments.
4. Posting#
Look for these:
- OAuth connection. Never paste a password or token into a tool.
- TikTok’s official posting API. Tools that drive a browser session put your account at risk.
- A drafts option. Sending a post to your TikTok inbox to publish yourself is a good first step on a new account. See how to warm up a TikTok account.
- Clear failures. When TikTok accepts a post and YouTube rejects it, you need the account, the status and the platform’s error, plus a retry that does not re-render.
Looptake can auto-post to TikTok, Instagram Reels and YouTube Shorts on schedule.
5. Feedback#
Per-post views, likes, comments, shares and saves show what the platform did. The useful step is feeding that back: angles that worked get made again, angles that did not get dropped. In Looptake, analytics feed the next batch, and trends feed new hooks.
Trending sounds#
Trending audio helps on TikTok, but business accounts only get the commercial sound library. Be wary of any tool that promises any trending sound on a business account. What a tool can do is show which sounds, formats and topics are moving so you build to them.
Formats that suit TikTok#
- Text on screen. A bold statement over a quiet clip. It reads in the first half second and is the cheapest way to test a claim. See text-based videos for TikTok.
- Slideshow. Swipeable images with text. TikTok supports photo posts natively, and they need no footage.
- Green screen meme. A reaction-style cut with your product behind the presenter. Strong for apps and software.
- AI avatar or UGC style. A presenter speaking to camera, without filming anyone. See AI UGC.
Test claims on the cheap formats first, then spend on AI media for the winners.
Where to start#
- One platform, one format. Post for two weeks and check that you like your own output.
- Add a second platform only when the first runs smoothly. Each platform adds review work.
- Add a cadence when the bottleneck is “nobody pressed post”, not “we do not know what to say”.
Agencies should give each brand its own workspace. Two brands in one workspace means one blended brand voice and one mis-click away from posting a client’s video to another client’s account. Looptake for agencies adds client workspaces, brand kits and client review links.
Checklist#
- Native 1080 by 1920, no padding.
- One frame rate, 30 unless there is real motion.
- Text inside the safe zones.
- Voice above music, no silent start.
- Master file kept.
- Same input, same output.
- OAuth and the official posting API, with a drafts option.
- Per-platform failures that name the account and the error.