Guides
Sume guides: the API, Formats, agents, models, media tools and pricing, each answer dated and sourced.
Create motivational videos with AI: voice, shots, and music
Create motivational videos with AI: a slow spoken quote over cinematic shots, a music bed that builds and ducks under the voice, and big captions.
What is audio ducking? Meaning, settings, and how it works
Audio ducking automatically lowers music while a voice speaks and raises it in the pauses. How the sidechain works, and what each setting does.
SRT vs VTT: the difference between the two subtitle formats
SRT and VTT are both plain-text subtitle files. VTT adds a WEBVTT header, dot milliseconds, positioning and styling, and is what HTML5 players read.
Hormozi-style captions: what they are and how to make them
Hormozi-style captions are big uppercase words shown one at a time, timed to speech, with key words in a contrast color. How to make them by API.
Video shot list template: columns, example, AI version
A video shot list is one row per shot: number, what we see, framing, move, length, audio, source. A template to copy, plus the columns AI video needs.
n8n YouTube Shorts automation: make a video, then upload it
Automate YouTube Shorts in n8n: start a vertical video with an HTTP Request node, download the finished MP4, and post it with the YouTube node's Upload.
n8n Schedule Trigger: time zone, cron, and why it won't fire
n8n's Schedule Trigger runs a workflow on an interval or cron, in the workflow's time zone, once the workflow is published. Setup, fixes, and safe paid calls.
n8n human in the loop: approve each AI video before posting
In n8n, a Send and Wait for Response step pauses the workflow until a person approves or declines. Put it after the video is made and before it is posted.
n8n RSS Feed Trigger: start a video for each new feed item
n8n's RSS Feed Trigger polls a feed and emits items newer than the last one it saw. Send each item's text to a video run keyed on its guid.
n8n: upload a file to Google Drive from a URL
Download the file with n8n's HTTP Request node set to return a File, then upload that binary with the Google Drive node's Upload operation into a folder.
n8n Google Sheets Trigger: start a video from each new row
n8n's Google Sheets Trigger polls a sheet and fires on added or updated rows. Key each row's video run on a row id so an edit doesn't bill twice.
Google Sheets onEdit trigger: call an API when a row changes
A simple onEdit trigger can't call UrlFetchApp, which needs authorization. Use an installable edit trigger to call an API from a Sheets edit.
Can you schedule YouTube Shorts? Yes, in Studio or by API
Yes. Upload a Short in YouTube Studio and set a publish time on the Schedule card, or set status.publishAt on a private upload with the Data API.
n8n upload to TikTok with the HTTP Request node
n8n has no TikTok node in its docs. Upload with HTTP Request nodes: query creator info, init a Direct Post with FILE_UPLOAD, then PUT the bytes.
YouTube Zapier integration: upload a video from a Zap
Zapier's YouTube integration has an Upload Video action. Map a public, direct file URL into its Video field to post a finished video from a Zap.
Schedule by Zapier: run a Zap every day to make a video
Schedule by Zapier starts a Zap every hour, day, week, or month. Add a Custom Request keyed on the date to start one video run per day.
Make.com scheduler: run a scenario daily to make a video
Make.com schedules each scenario in its Schedule settings: intervals, daily, weekly, monthly, set dates, or on demand. Start a daily video run this way.
Zapier: upload a file to Google Drive from a URL
Use Google Drive's Upload File action in Zapier and map a file object or a public, direct-download URL into its File field. Zapier fetches it.
HeyGen API pricing: how pay-as-you-go credits work
HeyGen's API is pay-as-you-go: USD credits bought apart from any plan, priced per minute by avatar engine and charged by actual seconds generated.
Synthesia API pricing: which plan, and how credits work
Synthesia's API comes with a subscription on the Creator plan and up. API video is paid in plan credits: 75 credits per minute of API usage.
AI training video generator: from written steps to video
An AI training video generator turns written steps into presenter videos. Build one module from short avatar clips: one clip per step, captioned, joined.
Employee onboarding video: a new-hire series made with AI
An employee onboarding video shows new hires how the company works. Make it as short AI avatar clips, one topic each, so you can replace one at a time.
Customer onboarding video: one short clip per setup step
A customer onboarding video walks a new customer through one step of getting started. Render one short AI avatar clip per step from your backend.
Security awareness training video: short clips made with AI
A security awareness training video teaches staff one security habit per clip. Make each topic a short captioned AI avatar clip and refresh only what changed.
Sales enablement video: short talk-track clips made with AI
A sales enablement video teaches reps one talk track: a pitch, an objection, a release. Make each a short AI avatar clip and re-render it when it goes stale.
Video prospecting with an AI avatar: one clip per prospect
Video prospecting puts a short personal video in a sales outreach message. With an AI avatar, fill one script template per prospect and render each clip.
New product launch video with an AI avatar presenter
A new product launch video names the problem, shows what's new, and ends on one call to action. Make it from launch copy with an AI avatar presenter.
Press release video: an announcement read by an AI avatar
A press release video reads the headline, key facts, and a quote in about a minute, captioned from the release text. How to make one with an AI avatar.
Convert video to SCORM: wrap an MP4 in a SCORM package
A video isn't SCORM by itself. To convert it, put the MP4 in a ZIP with an imsmanifest.xml, as a static asset or inside a page that reports completion.
Creatify API: AI avatar videos, Aurora lip sync and credits
The Creatify API makes avatar videos from text or audio, Aurora talking videos from a photo and audio, and ads from a URL, billed in plan credits.
Synthesia alternatives with an API: access, pricing, limits
Argil, Creatify, HeyGen and Sume each document an avatar video API. They differ in how API access is sold, the price unit and the length limits.
Lip sync AI API options: photo or video input, limits, price
Lip sync APIs take a face and audio and return a talking clip. Some animate a photo, others redub an existing video. Inputs, limits and price units.
HeyGen text to speech API: endpoint, limits and price
HeyGen's API has a text to speech endpoint, POST /v3/voices/speech: up to 5,000 characters per call, catalog voices, word timestamps, $0.12 a minute.
Seedance 2.0 Fast vs Seedance 2.0 (and Mini): what differs
Seedance 2.0 Fast and Seedance 2.0 take the same inputs and 4–15 s lengths; the price differs: about $0.30 vs $0.38 a 720p second.
Seedance vs Seedream: ByteDance's video and image models
Seedance is ByteDance Seed's video model family; Seedream is its image model family. What each makes, takes, and costs through one API.
Kling vs Grok Imagine: Kling 3.0 and Grok Imagine Video 1.5
Kling 3.0 makes clips from text or an image, with an end frame and sound; Grok Imagine Video 1.5 animates one image, silent, for $0.0125/s.
AI video generator comparison table: price, length, sound
An AI video generator comparison on the same columns: billed rate, clip length, resolutions, sound and inputs for 11 video models, dated.
Seedance vs Sora 2: specs side by side after the shutdown
Sora 2 shut down on September 24, 2026. Its clip lengths, frame sizes, inputs, extensions and edits beside Seedance 2.0 and 2.5, which you can still call.
Sora 2 API pricing: per-second rates and the shutdown
OpenAI priced the Sora 2 API per second: $0.10 for Sora 2, $0.30–$0.70 for Sora 2 Pro. The API shut down on September 24, 2026. What a clip costs now.
How to download Sora videos after the shutdown
To download Sora videos, open sora.chatgpt.com/sunset and click Export; OpenAI emails you when it's ready. Export soon: the data is deleted later.
Runway API pricing: credits per second by video model
Runway's API sells credits at $0.01 each and bills video per second: 12 credits a second on Gen-4.5, 5 on Gen-4 Turbo. Rates, minimums and add-ons.
Runway credits per video: what one clip costs
A Runway video costs its length times the model's credits per second: Gen-4.5 uses 60 credits for 5 seconds. What each plan's credits buy, dated.
How do AI credits work? Price, tokens and expiry
AI credits are prepaid units a vendor sells at a set price and spends per generation. What a credit is worth, how it differs from tokens, when it expires.
Pay as you go AI video generator: API or subscription?
A pay-as-you-go AI video generator bills each clip by its length, with no monthly allowance to use up or lose. How that compares with credit plans.
AI video production cost: a line-item breakdown
AI video production cost is the clips plus voiceover, music, captions and assembly. A 30-second video on Sume, line by line, at each published rate.
Shopify Flow automation: start an AI product video
Shopify Flow automation can start an AI product video: a Send HTTP request action posts each new product to a video API, keyed so retries can't repeat.
Shopify product metafields: add a video to a product
Shopify product metafields are custom product fields. A File metafield holds one MP4 or MOV video, and a text field can track the video's status.
How to add a video to a Shopify product page
Add a video to a Shopify product page from the product's Media section: upload the file or paste a YouTube or Vimeo link. Your theme must support video.