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Video and audio processing with FFmpeg.
Passed 19 of 23 test cases with the skill, and 17 of 23 without it.
2 fixed17 passed either way4 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.
Write an FFmpeg command to optimize out/video.mp4 for LinkedIn. I want high visual quality with CRF 22, main profile, scale constrained to 1080p max, and fast start streaming metadata enabled.
| Checked | Without skill | With skill |
|---|---|---|
| uses CRF 22 for video encoding | Passed | Passed |
| constrains video scale using min(1920,iw) and min(1080,ih) | Missed | Passed |
The instructions your model reads when the skill loads.
FFmpeg is the essential tool for video/audio processing. This skill covers common operations for Remotion video projects.
ffmpeg -i input.gif -movflags faststart -pix_fmt yuv420p \
-vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" output.mp4
Why these flags:
-movflags faststart - Moves metadata to start for web streaming-pix_fmt yuv420p - Ensures compatibility with most playersscale=trunc(...) - Forces even dimensions (required by most codecs)# To 1920x1080 (maintain aspect ratio, add black bars)
ffmpeg -i input.mp4 -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2" output.mp4
# To 1920x1080 (crop to fill)
ffmpeg -i input.mp4 -vf "scale=1920:1080:force_original_aspect_ratio=increase,crop=1920:1080" output.mp4
# Scale to width, auto height
ffmpeg -i input.mp4 -vf "scale=1280:-2" output.mp4
# Good quality, smaller file (CRF 23 is default, lower = better quality)
ffmpeg -i input.mp4 -c:v libx264 -crf 23 -preset medium -c:a aac -b:a 128k output.mp4
# Aggressive compression for web preview
ffmpeg -i input.mp4 -c:v libx264 -crf 28 -preset fast -c:a aac -b:a 96k output.mp4
test cases passed, vs 17 / 23 without
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