claude-video-export — Platform-Optimized Export

Pre-Flight

1. Run bash scripts/preflight.sh "$INPUT" "$OUTPUT"
2. Run bash scripts/detect_gpu.sh for encoder selection
3. Analyze input: ffprobe -v error -select_streams v:0 -show_entries stream=width,height,r_frame_rate -of json "$INPUT"

Platform Presets

YouTube (1080p)

ffmpeg -n -i "$INPUT" -c:v libx264 -preset slow -crf 18 -profile:v high -level 4.1 \
  -pix_fmt yuv420p -bf 2 -g 30 -movflags +faststart \
  -c:a aac -b:a 384k -ar 48000 "${INPUT%.*}_youtube.mp4"

YouTube 4K:

ffmpeg -n -i "$INPUT" -c:v libx264 -preset slow -crf 18 -profile:v high -level 5.1 \
  -pix_fmt yuv420p -movflags +faststart \
  -c:a aac -b:a 512k -ar 48000 "${INPUT%.*}_youtube_4k.mp4"

YouTube NVENC (5-10x faster):

ffmpeg -n -hwaccel cuda -hwaccel_output_format cuda -i "$INPUT" \
  -c:v h264_nvenc -preset p5 -tune hq -rc constqp -cq 19 \
  -profile:v high -movflags +faststart \
  -c:a aac -b:a 384k -ar 48000 "${INPUT%.*}_youtube.mp4"

TikTok / Reels / Shorts (9:16 Vertical)

Center crop (from 16:9 source):

ffmpeg -n -i "$INPUT" \
  -vf "crop=ih*9/16:ih,scale=1080:1920:flags=lanczos" \
  -c:v libx264 -crf 20 -preset medium -profile:v high -pix_fmt yuv420p \
  -c:a aac -b:a 128k -ar 44100 -movflags +faststart \
  -t 180 "${INPUT%.*}_tiktok.mp4"

Note: TikTok max 10 min, Reels max 3 min, Shorts max 3 min. The -t 180 caps at 3 min.

With padding (black bars, no crop):

ffmpeg -n -i "$INPUT" \
  -vf "scale=1080:-2:flags=lanczos,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:black" \
  -c:v libx264 -crf 20 -preset medium -profile:v high -pix_fmt yuv420p \
  -c:a aac -b:a 128k -movflags +faststart "${INPUT%.*}_vertical.mp4"

With blur background (cinematic, no black bars):

ffmpeg -n -i "$INPUT" -i "$INPUT" -filter_complex \
  "[0:v]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,gblur=sigma=20[bg];\
   [1:v]scale=1080:1920:force_original_aspect_ratio=decrease[fg];\
   [bg][fg]overlay=(W-w)/2:(H-h)/2" \
  -c:v libx264 -crf 20 -preset medium -c:a aac -b:a 128k \
  -movflags +faststart "${INPUT%.*}_tiktok_blur.mp4"

Instagram Feed (Square 1:1)

ffmpeg -n -i "$INPUT" \
  -vf "crop=min(iw\,ih):min(iw\,ih),scale=1080:1080:flags=lanczos" \
  -c:v libx264 -crf 20 -preset medium -profile:v high -pix_fmt yuv420p \
  -c:a aac -b:a 128k -movflags +faststart \
  -t 60 "${INPUT%.*}_ig_square.mp4"

Instagram Feed (Portrait 4:5)

ffmpeg -n -i "$INPUT" \
  -vf "crop=ih*4/5:ih,scale=1080:1350:flags=lanczos" \
  -c:v libx264 -crf 20 -preset medium -profile:v high -pix_fmt yuv420p \
  -c:a aac -b:a 128k -movflags +faststart \
  -t 60 "${INPUT%.*}_ig_portrait.mp4"

LinkedIn

ffmpeg -n -i "$INPUT" \
  -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2:black" \
  -c:v libx264 -crf 20 -preset medium -profile:v high -pix_fmt yuv420p \
  -c:a aac -b:a 192k -movflags +faststart \
  -fs 200M "${INPUT%.*}_linkedin.mp4"

Note: LinkedIn max 200MB / 10 min. The -fs 200M caps file size.

Web (VP9 + Opus for modern browsers)

ffmpeg -n -i "$INPUT" \
  -c:v libvpx-vp9 -crf 30 -b:v 0 -row-mt 1 \
  -c:a libopus -b:a 128k "${INPUT%.*}_web.webm"

Podcast (Audio-Only)

# AAC (most compatible)
ffmpeg -n -i "$INPUT" -vn \
  -af "loudnorm=I=-16:TP=-1.5:LRA=11" \
  -c:a aac -b:a 128k -ar 44100 "${INPUT%.*}_podcast.m4a"

# MP3 (universal)
ffmpeg -n -i "$INPUT" -vn \
  -af "loudnorm=I=-16:TP=-1.5:LRA=11" \
  -c:a libmp3lame -b:a 192k -ar 44100 "${INPUT%.*}_podcast.mp3"

High-Quality GIF

# Short clip (3 seconds starting at 5s)
ffmpeg -n -ss 5 -t 3 -i "$INPUT" \
  -vf "fps=15,scale=480:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
  "${INPUT%.*}.gif"

For longer GIFs, consider reducing fps to 10 and scale to 320px width.

Twitter/X

ffmpeg -n -i "$INPUT" \
  -vf "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2:black" \
  -c:v libx264 -crf 22 -preset medium -profile:v high -pix_fmt yuv420p \
  -c:a aac -b:a 128k -movflags +faststart \
  -fs 512M -t 140 "${INPUT%.*}_twitter.mp4"

Note: Twitter max 512MB / 2:20.

Platform Specs Quick Reference

Multi-Platform Export

To export for multiple platforms at once, Claude should chain exports sequentially. Each export is independent — they share the same input but produce separate outputs.

Output Naming

Auto-generated output names use the pattern: {input_basename}_{platform}.{ext}

• video.mp4 → video_youtube.mp4, video_tiktok.mp4, video_ig_square.mp4

Reference

Load references/export-presets.md for detailed per-platform codec settings, bitrate targets, and container requirements.