Video spec sheet
Octomind Agents Registry
npx -y skills add Muvon/octomind-tap --skill video-spec-sheetAssembled from the repository path, not quoted from the project. Check it against their README if it does not work.
One thing to look at
- 3 stars3 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.
What its author says it does
Copied from the file, not written here
Canonical reference for platform-by-platform video output specs: aspect ratio, length cap, codec, bitrate, frame rate, color, caption style and safe-zone bands. Use when picking output settings, validating an export, or spec-checking before publishing. Covers TikTok, Reels, Shorts, IG/FB feed, Stories, X, LinkedIn — all four format families: short-form vertical, square/feed, long-form 16:9, story 9:16.
The file declares its own license as Apache-2.0. That is the author’s claim about this one file, and it is not the same thing as the license GitHub reports for the repository, which is listed with the other numbers below.
SKILL.md
8.2 KB, ~2.6k tokens by cl100k_base, as published. Nobody here has run it
Overview
Each social platform has its own combination of aspect ratio, max duration, codec, bitrate, frame rate, and caption / UI safe zones. Getting any of these wrong on the export means the platform will either reject, re-encode (quality drop), or crop your creative. This skill encodes the current 2026 specs as a single-source-of-truth table the agent can extract from per brief.
Instructions
Core Rules
- Always pick the platform spec before generating frames — generation must match the export aspect ratio (don't generate 16:9 then crop to 9:16 unless intentional).
- Burn captions on top of the base render, not as a sidecar — sound-off viewing is the default.
- Respect the safe zone — keep all critical text and faces away from where the platform's UI sits (top, bottom, right side for TikTok).
- Final encode in H.264 / yuv420p, even if the source is HEVC / 10-bit. Universal compatibility beats marginal quality.
- Audio: AAC stereo, 128 kbps minimum, 48 kHz sample rate. Mono audio reads as low-quality on most feeds.
- Loudness: -14 LUFS integrated (TikTok / IG / YT now normalize to roughly this — overshooting means platform compression hits you).
Platform Spec Table
| Platform | Aspect | Resolution | Length cap | Frame rate | Codec | Bitrate | Audio |
|---|---|---|---|---|---|---|---|
| TikTok feed | 9:16 | 1080×1920 | 60s (organic), 60min (max) | 30 / 60 | H.264 | 8–10 Mbps | AAC 128k 48kHz |
| Instagram Reels | 9:16 | 1080×1920 | 90s (organic), 15min (Reels Long) | 30 | H.264 | 5–8 Mbps | AAC 128k 48kHz |
| YouTube Shorts | 9:16 | 1080×1920 | 60s (cap is enforced) | 30 / 60 | H.264 | 8–12 Mbps | AAC 192k 48kHz |
| IG / FB feed video | 1:1 or 4:5 | 1080×1080 / 1080×1350 | 60min (FB), 90s organic on Reels | 30 | H.264 | 5–8 Mbps | AAC 128k 48kHz |
| IG / FB Stories | 9:16 | 1080×1920 | 60s per card | 30 | H.264 | 5–8 Mbps | AAC 128k 48kHz |
| Snapchat | 9:16 | 1080×1920 | 60s | 30 | H.264 | 5–8 Mbps | AAC 128k 48kHz |
| YouTube long-form | 16:9 | 1920×1080 (1080p) / 3840×2160 (4K) | 12hr | 30 / 60 | H.264 (or H.265 source) | 8–12 Mbps (1080p) / 35–45 Mbps (4K) | AAC 192k 48kHz |
| X / Twitter | 16:9 or 1:1 | 1280×720+ | 140s organic, 10min Premium | 30 / 60 | H.264 | 5–25 Mbps | AAC 128k 48kHz |
| LinkedIn feed | 16:9, 1:1, 9:16 | 1920×1080 / 1080×1080 / 1080×1920 | 10min | 30 | H.264 | 8–10 Mbps | AAC 128k 48kHz |
| Pinterest Idea Pin | 9:16 | 1080×1920 | 60s | 30 | H.264 | 5–8 Mbps | AAC 128k 48kHz |
Safe Zones (don't put critical content here)
| Platform | Top reserve | Bottom reserve | Right reserve | Left reserve |
|---|---|---|---|---|
| TikTok | 130 px | 350 px (caption + buttons) | 200 px (action rail) | 0 px |
| IG Reels | 200 px (header) | 360 px (caption + reel CTA) | 100 px | 0 px |
| YT Shorts | 110 px | 280 px | 180 px | 0 px |
| IG Stories | 250 px (DM bar) | 250 px (Send to / Reactions) | 0 px | 0 px |
| FB Reels | 200 px | 350 px | 120 px | 0 px |
| YT long-form 16:9 | 60 px | 100 px (progress bar) | 0 px | 0 px |
(All measured at 1080×1920 or 1920×1080. Scale with output resolution.)
Captions / On-Screen Text Rules
- Center caption block, never bottom-aligned (bottom is platform UI).
- For 9:16: caption block sits roughly in the upper-center third (between Y=600 and Y=1200 of 1080×1920) — avoids both header and CTA bar.
- Font: bold sans (Inter Bold, Helvetica Black, SF Pro Display Bold, Montserrat Black). 80–110 pt for headline hooks at 1080×1920.
- Stroke + drop shadow: 2 px stroke, 1 px shadow, opacity 0.6 — preserves readability over any background.
- One sentence per card max. Two-sentence cards get skipped.
- Word-by-word reveal in time with VO outperforms full-sentence flat captions on TikTok / Reels.
Output Presets (ffmpeg) — copy-paste ready
# 9:16 — TikTok / Reels / Shorts / Stories
-vf "scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:color=black,fps=30" \
-c:v libx264 -profile:v high -level 4.0 -crf 21 -preset slow -pix_fmt yuv420p \
-c:a aac -b:a 128k -ar 48000 -ac 2 \
-movflags +faststart
# 1:1 — IG / FB feed
-vf "scale=1080:1080:force_original_aspect_ratio=decrease,pad=1080:1080:(ow-iw)/2:(oh-ih)/2:color=black,fps=30" \
-c:v libx264 -profile:v high -crf 21 -preset slow -pix_fmt yuv420p \
-c:a aac -b:a 128k -ar 48000 -ac 2 -movflags +faststart
# 16:9 — YouTube long-form / LinkedIn
-vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2:color=black,fps=30" \
-c:v libx264 -profile:v high -level 4.2 -crf 19 -preset slow -pix_fmt yuv420p \
-c:a aac -b:a 192k -ar 48000 -ac 2 -movflags +faststart
Workflow
- Identify primary platform for the brief (TikTok / Reels / Shorts / etc.).
- Pick aspect, length cap, fps from the table.
- Mark safe zones when storyboarding — keep face, hook text, CTA inside the center region.
- At export, use the matching ffmpeg preset above.
- If publishing to multiple platforms, render the master in the largest aspect (e.g. 9:16 1080×1920 30fps) and downconvert to others — never upscale.
Decision Guide
| Brief says | Output |
|---|---|
| "TikTok ad" | 9:16, 1080×1920, 30fps, ≤60s, H.264 8 Mbps |
| "Instagram Reel" | 9:16, 1080×1920, 30fps, ≤90s, H.264 6 Mbps |
| "YouTube Short" | 9:16, 1080×1920, 60fps if motion-heavy else 30, ≤60s, H.264 10 Mbps |
| "Story (any platform)" | 9:16, 1080×1920, 30fps, ≤15s per card |
| "IG feed" | 4:5, 1080×1350, 30fps |
| "FB feed" | 1:1, 1080×1080, 30fps |
| "YouTube long-form" / "explainer" | 16:9, 1920×1080, 30fps (60fps if screen-cap) |
| "Hero video for landing page" | 16:9, 1920×1080, 30fps, mute by default, MP4 + WebM |
| "X / Twitter post" | 16:9 1280×720 if widescreen, else 1:1 1080×1080 |
| "LinkedIn post" | 1:1 1080×1080 (preferred) or 16:9 1920×1080 |
| "Pinterest" | 9:16 1080×1920 |
Examples
Example 1: TikTok ad export
Source: 4K 16:9 24fps generated at Veo. Target: TikTok ad.
ffmpeg -i source.mp4 \
-vf "scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:color=black,fps=30" \
-c:v libx264 -profile:v high -level 4.0 -crf 21 -preset slow -pix_fmt yuv420p \
-c:a aac -b:a 128k -ar 48000 -ac 2 \
-movflags +faststart \
tiktok-ad-9x16.mp4
Example 2: Cross-platform render plan
Brief: One ad, ship to TikTok + IG Reels + IG feed + YT Shorts + YT long-form trailer.
| Cut | Aspect | Resolution | Length |
|---|---|---|---|
| Master | 9:16 | 1080×1920 | 45s |
| TikTok | 9:16 | 1080×1920 | 45s (master) |
| IG Reels | 9:16 | 1080×1920 | 45s (master) |
| YT Shorts | 9:16 | 1080×1920 | 45s (master, captions repositioned higher) |
| IG feed (1:1 cut-down) | 1:1 | 1080×1080 | 30s (re-edited, key beats only) |
| YT long-form trailer | 16:9 | 1920×1080 | 60s (re-edited, b-roll padded) |