JosiahSiegel/viral-video-platform-specs
plugins/ffmpeg-social-video/skills/viral-video-platform-specs/SKILL.md
Complete platform upload specifications for viral video creation across TikTok, YouTube Shorts, Instagram Reels, Facebook Reels, Snapchat Spotlight, and Twitter/X. PROACTIVELY activate for: (1) Platform-specific video encoding, (2) Upload requirements lookup, (3) Multi-platform export, (4) File size optimization, (5) Aspect ratio conversion, (6) Duration limits, (7) Audio requirements, (8) Caption/subtitle specs, (9) Thumbnail requirements, (10) Quality vs compatibility trade-offs. Provides: Comprehensive spec tables, FFmpeg presets per platform, optimal encoding settings, file size calculators, batch export workflows, and 2025-2026 platform-specific algorithm insights.
$ install --global
skillsauthnpx skillsauth add JosiahSiegel/claude-plugin-marketplace viral-video-platform-specsInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: May 22, 2026, 6:59 AM150.8s2 files scanned
SKILL.md
- name:
- viral-video-platform-specs
- description:
- |
- PROACTIVELY activate for:
- (1) Platform-specific video encoding, (2) Upload requirements lookup, (3) Multi-platform export, (4) File size optimization, (5) Aspect ratio conversion, (6) Duration limits, (7) Audio requirements, (8) Caption/subtitle specs, (9) Thumbnail requirements, (10) Quality vs compatibility trade-offs.
- Provides:
- Comprehensive spec tables, FFmpeg presets per platform, optimal encoding settings, file size calculators, batch export workflows, and 2025-2026 platform-specific algorithm insights.
Viral Video Platform Specifications
Use this skill to choose export settings for TikTok, YouTube Shorts, Instagram Reels, Facebook Reels, Snapchat Spotlight, Twitter/X, Pinterest, LinkedIn, and mobile-browser playback. This SKILL is a lean orchestrator; detailed platform tables, commands, and recipes are preserved in references/platform-details-and-recipes.md.
Quick Reference
| Platform | Aspect | Recommended resolution | Practical duration | Max size | Default codec | |---|---:|---:|---:|---:|---| | TikTok | 9:16 | 1080x1920 | 21-34s | 287 MB iOS | H.264 + AAC | | YouTube Shorts | 9:16 | 1080x1920 | 50-59s | 256 GB | H.264 or VP9 | | Instagram Reels | 9:16 | 1080x1920 | 7-30s | 4 GB | H.264 + AAC | | Facebook Reels | 9:16 | 1080x1920 | 15-30s | 4 GB | H.264 + AAC | | Snapchat Spotlight | 9:16 | 1080x1920 | <=60s | 300 MB | H.264 + AAC | | Twitter/X | 9:16, 16:9, 1:1 | 1080x1920 | <=140s | 512 MB | H.264 + AAC |
Universal Social Export Baseline
ffmpeg -i input.mp4 \
-vf "scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:black,setsar=1,fps=30" \
-c:v libx264 -preset medium -crf 22 -profile:v high -level 4.1 \
-c:a aac -b:a 192k -ar 48000 -ac 2 \
-pix_fmt yuv420p -movflags +faststart \
output_social.mp4
Adjust loudness, duration, bitrate, and metadata per platform from the reference file.
Core Workflow
- Verify
ffmpeg -version; prefer current stable builds for security and codec fixes. - Identify target platform(s) and whether the video is native-app upload or mobile-browser playback.
- Normalize to vertical 9:16 unless the platform or campaign calls for square/horizontal.
- Use H.264/AAC for the broadest acceptance. Use VP9 only when intentionally targeting YouTube/WebM.
- Apply platform loudness targets: TikTok/Reels often around -10 to -12 LUFS; YouTube around -14 LUFS; Facebook around -13 LUFS.
- Keep
-pix_fmt yuv420pand-movflags +faststartfor compatibility. - Verify output with
ffprobebefore upload.
Key Gotchas
- All major social platforms re-encode uploads; high-quality H.264 is usually a better upload source than HEVC/AV1 for social delivery.
- For web/mobile-browser playback, profile/level,
yuv420p, and faststart matter more than platform upload limits. - Keep captions and UI out of unsafe top/bottom regions, especially lower 35% on Reels-style interfaces.
- Two-pass bitrate control is useful when a platform file-size ceiling is strict.
Reference Map
references/platform-details-and-recipes.md- Full preserved reference: per-platform spec tables, FFmpeg presets, two-pass examples, multi-platform export script, file-size calculation, codec comparison, mobile-safe playback, color grading, text/caption readability, verification commands, sources.
Related Skills
viral-video-animated-captions- CapCut-style caption generationviral-video-hook-templates- Hook patterns and retention tacticsffmpeg-animation-timing-reference- Timing, readability, sync, and platform pacingffmpeg-command-syntax- Correct option placement
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