Perform various data analysis on SEC 13-F and obtain some insights of fund activities such as number of holdings, AUM, and change of holdings between two quarters.
中文简介正在准备中。当前显示原文说明。
benchflow-ai/skillsbench18652026年10月13日 更新
免费在 GitHub 公开
ffmpeg-video-editing
Cut, trim, concatenate, and split video files - basic video editing operations
中文简介正在准备中。当前显示原文说明。
查看安装方法包含的文件（1）
- SKILL.md2.5 KB
SKILL.md（原文）
安装前可以查看交给 AI 代理的指令内容。
FFmpeg Video Editing Skill
Basic video editing operations: cutting, trimming, concatenating, and splitting videos.
When to Use
- Cut segments from video
- Trim video length
- Concatenate multiple videos
- Split video into parts
- Extract specific time ranges
Cutting and Trimming
# Cut from 10s to 30s (using -ss and -to)
ffmpeg -ss 00:00:10 -to 00:00:30 -i input.mp4 -c copy output.mp4
# Cut from 10s for 20 seconds duration
ffmpeg -ss 00:00:10 -t 20 -i input.mp4 -c copy output.mp4
# First 60 seconds
ffmpeg -t 60 -i input.mp4 -c copy output.mp4
# Last 30 seconds (need duration first)
ffmpeg -sseof -30 -i input.mp4 -c copy output.mp4
Precise Cutting
# With re-encoding (more precise)
ffmpeg -ss 00:00:10 -i input.mp4 -t 20 -c:v libx264 -c:a aac output.mp4
# Keyframe-accurate (faster, may be less precise)
ffmpeg -ss 00:00:10 -i input.mp4 -t 20 -c copy output.mp4
Concatenation
Method 1: File List (Recommended)
# Create list.txt file:
# file 'video1.mp4'
# file 'video2.mp4'
# file 'video3.mp4'
ffmpeg -f concat -safe 0 -i list.txt -c copy output.mp4
Method 2: Same Codec Files
# If all videos have same codec/format
ffmpeg -i "concat:video1.mp4|video2.mp4|video3.mp4" -c copy output.mp4
Method 3: Re-encode (Different Codecs)
# Re-encode for compatibility
ffmpeg -f concat -safe 0 -i list.txt -c:v libx264 -c:a aac output.mp4
Splitting Video
# Split into 60-second segments
ffmpeg -i input.mp4 -c copy -f segment -segment_time 60 \
-reset_timestamps 1 output_%03d.mp4
# Split at specific timestamps
ffmpeg -i input.mp4 -ss 00:00:00 -t 00:01:00 -c copy part1.mp4
ffmpeg -i input.mp4 -ss 00:01:00 -t 00:01:00 -c copy part2.mp4
Extract Segment with Re-encoding
# When you need to change quality/codec
ffmpeg -ss 00:00:10 -i input.mp4 -t 20 \
-c:v libx264 -crf 23 -c:a aac -b:a 192k output.mp4
Multiple Segments
# Extract multiple segments
ffmpeg -i input.mp4 \
-ss 00:00:10 -t 00:00:05 -c copy segment1.mp4 \
-ss 00:01:00 -t 00:00:10 -c copy segment2.mp4
Notes
- Use
-c copyfor speed (no re-encoding) -ssbefore-iis faster but less precise-ssafter-iis more precise but slower- Concatenation requires same codec/format for
-c copy - Use file list method for best concatenation results
评价
还没有评价。欢迎分享你的使用感受。
评论
无需登录即可发表。欢迎分享使用感受、提问，或说明在哪些环境下无法运行。
还没有评论。来写第一条吧。
同一仓库的技能
AC branch pi-model power flow equations (P/Q and |S|) with transformer tap ratio and phase shift, matching `acopf-math-model.md` and MATPOWER branch fields. Use when computing branch flows in either direction, aggregating bus injections for nodal balance, checking MVA (rateA) limits, computing branch loading %, or debugging sign/units issues in AC power flow.
中文简介正在准备中。当前显示原文说明。
benchflow-ai/skillsbench18652026年10月13日 更新
Redact text from PDF documents for blind review anonymization
中文简介正在准备中。当前显示原文说明。
benchflow-ai/skillsbench18652026年10月13日 更新
Use when checking simplified ADA-derived plan-view bathroom accessibility constraints such as turning space, door clear width, toilet centerline, grab bars, and lavatory knee/toe clearance.
中文简介正在准备中。当前显示原文说明。
benchflow-ai/skillsbench18652026年10月13日 更新
Analyze failed GitHub Action jobs for a pull request.
中文简介正在准备中。当前显示原文说明。
benchflow-ai/skillsbench18652026年10月13日 更新
Use when extracting plan-view architectural geometry from DXF files with semantic CAD layers, especially when outputs must normalize rooms, doors, fixtures, clearances, and grab bars into machine-checkable JSON.
中文简介正在准备中。当前显示原文说明。
benchflow-ai/skillsbench18652026年10月13日 更新