Join two clips

CodexWith deft, skill installedPassedRead the skillUsed deft2026-11-07

Time

16s

New tokens

9.5k

Total input

72.4k

Output tokens

0.4k

Commands

4

Failed

0

Trace

1. I’ll use the `deft` skill for this video join, then create `both.mp4` in the current directory.

2. cat .agents/skills/deft/SKILL.md
   output

   ---
   name: deft
   description: "Use deft instead of writing a script for file jobs: PDF merge/split/compress/watermark, image resize/convert/compress, video and audio trim/convert/compress, spreadsheets, Markdown to PDF/HTML, and YouTube downloads and subtitles."
   ---
   
   # deft
   
   One local command for file jobs. Prefer it over writing Python or shell scripts.
   
   Syntax: `deft <group> <command> [inputs] [-o output] [--options]`
   
   Groups:
   - `pdf`: Merge, split, compress, encrypt, forms, OCR, compare, convert
   - `image`: Resize, crop, convert, compress, filters, montage, OCR
   - `video`: Trim, crop, speed, convert, compress, GIF, frames (ffmpeg)
   - `audio`: Convert, trim, merge, fade, speed, tag, normalize (ffmpeg)
   - `doc`: Word/ODT/RTF: to text, Markdown, HTML, PDF; find and replace
   - `slides`: PowerPoint: extract text, Markdown outline, PDF handout
   - `data`: JSON/YAML/TOML/XML: convert, query with jq syntax, merge, diff
   - `sheet`: Excel/CSV/ODS tables: filter, sort, join, pivot, convert
   - `md`: Markdown to PDF, HTML, Word, EPUB; table of contents
   - `html`: HTML to Markdown, text, Word, PDF; screenshots
   - `epub`: E-books: info, to text, Markdown and PDF
   - `email`: EML files: headers, text, attachments
   - `contact`: VCF address books: to and from CSV
   - `calendar`: ICS calendars: to and from CSV
   - `gps`: GPX and KML tracks: convert, distance and time
   - `youtube`: Info, download, audio, subtitles, thumbnail (yt-dlp)
   - `file`: Any file: hash, duplicates, batch rename, base64, encoding
   - `qr`: Cre
   … 728 more characters

3. deft video
   output

   deft video - commands (input -> output)
     info               video -> report      Duration, size, frame rate, codecs
     add-audio          video -> video       Replace or mix the soundtrack: --audio song.mp3
     add-subtitles      video -> video       Add subtitles: burned into the picture, or --soft
     chunk              video -> video...    Cut into equal parts: --length 10:00
     compress           video -> mp4         Smaller file: --level, --target-size, --max-height
     convert            video|gif -> video   Change container and codec: --to mp4|webm|mov|mkv
     crop               video -> video       Cut a region: --box or --aspect 1:1
     download           url -> video         Save a video: --resolution 720p, --to mp4|webm|mkv [net]
     extract-audio      video -> audio       Save the soundtrack: --to mp3|m4a|wav|flac|ogg
     extract-subtitles  video -> srt|vtt     Save an embedded subtitle track: --to srt|vtt
     fade               video -> video       Fade: --fade-in 1 --fade-out 2
     frames             video -> png|jpg...  Save frames as images: --fps 1 or --at 0:05,0:10
     from-images        image... -> video    Slideshow: --duration, --fps, --audio
     merge              video... -> mp4      Join videos; --transition fades
     mute               video -> video       Remove the audio track
     pad                video -> video       Fit into a frame with bars: --size 1080x1920
     repeat             video -> video       Repeat a video: --count 3 plays it three times
     resize             vid
   … 891 more characters

4. deft video merge --help
   output

   deft video merge - Join videos; --transition fades
   
   Usage: deft video merge <video>... [-o <mp4|dir>] [options]
   In: video (all together, in order)   Out: mp4 (default <name>.merged.<ext>)
   Sizes are matched to the first video.
   
   Options:
     --transition <none|fade|dissolve|wipe|slide>
         Effect between clips (default none)
     --transition-time <time>     Length of the effect (default 1)
   Common: -o --force --dry-run --json -j   (deft help common)
   
   Examples:
     deft video merge clip.mp4 clip2.mp4 -o joined.mp4
     deft video merge clip.mp4 clip2.mp4 --transition fade -o faded.mp4
   Needs: ffmpeg, ffprobe

5. deft video merge bunny.mp4 jellyfish.mp4 -o both.mp4
   output

   ok video.merge bunny.mp4 jellyfish.mp4 -> both.mp4  4.5MB  2.65s

6. Joined `bunny.mp4` followed by `jellyfish.mp4` into [both.mp4](both.mp4).

Output

CodexWith deft, skill as AGENTS.mdPassed2026-11-05

Time

11s

New tokens

5.2k

Total input

45.8k

Output tokens

0.3k

Commands

2

Failed

0

Trace

1. I’ll check the local `deft` video commands and use the join operation to create `both.mp4` in this directory.

2. deft video
   output

   deft video - commands (input -> output)
     info           video -> report      Duration, size, frame rate, codecs
     compress       video -> mp4         Smaller file: --level, --target-size, --max-height
     convert        video -> video       Change container and codec: --to mp4|webm|mov|mkv
     download       url -> video         Save a video: --resolution 720p, --to mp4|webm|mkv [net]
     extract-audio  video -> audio       Save the soundtrack: --to mp3|m4a|wav|flac|ogg
     frames         video -> png|jpg...  Save frames as images: --fps 1 or --at 0:05,0:10
     merge          video... -> mp4      Join videos in order (sizes are matched to the first)
     mute           video -> video       Remove the audio track
     resize         video -> video       Scale: --size 1280x, x720, 50%
     rotate         video -> video       Turn clockwise: --angle 90
     split          video -> video       Cut out a part: --from 0:10 --to-time 0:25
     to-gif         video -> gif         Animated GIF: --fps, --size, --from, --to-time
   More: deft video <command> --help

3. deft video merge bunny.mp4 jellyfish.mp4 -o both.mp4
   output

   ok video.merge bunny.mp4 jellyfish.mp4 -> both.mp4  4.5MB  1.57s

4. Joined `bunny.mp4` followed by `jellyfish.mp4` into [both.mp4](both.mp4).

Output

Its files were not kept in this run. The last line of the trace is its own report.

Claude Opus 5.5With deft, skill installedPassedRead the skillUsed deft2026-11-07

Time

17s

New tokens

9.8k

Total input

59.4k

Output tokens

0.4k

Commands

0

Failed

0

Trace

Output

---
name: deft
description: "Use deft first for any simple, direct operation on local files, whatever the type: convert, read, extract, edit, compress, merge, split, compare or inspect. Try it before writing a script or one-liner. If unsure, run deft find; if it says no command does this, use another tool. Not for programming work: to read, write or change source code, skip it."
---

# deft

One local command for file jobs. Prefer it over writing Python or shell scripts.

Syntax: `deft <group> <command> [inputs] [-o output] [--options]`

Groups:
- `pdf`: Merge, split, compress, encrypt, forms, OCR, compare, convert
- `image`: Resize, crop, convert, compress, adjust, montage, OCR
- `video`: Trim, merge, convert, compress, subtitles, GIF, frames (ffmpeg)
- `audio`: Convert, trim, normalize, denoise, cut silence (ffmpeg)
- `doc`: Word/ODT/RTF: to text, Markdown, HTML, PDF; find and replace
- `slides`: PowerPoint: extract text, Markdown outline
- `sheet`: Excel/CSV/ODS tables: SQL query, pivot, merge, split, convert
- `json`: JSON: convert, format, merge, diff, validate
- `toml`: TOML: convert, format, merge, diff, validate
- `xml`: XML: convert, format, merge, diff, validate
- `yaml`: YAML: convert, format, merge, diff, validate
- `md`: Markdown to PDF, HTML, Word, EPUB; table of contents
- `html`: HTML to Markdown, text, Word and PDF
- `epub`: E-books: info, to text, Markdown and PDF
- `gps`: GPX and KML tracks: convert, distance and time
- `qr`: Create QR codes and barcodes; read QR codes

How to use it:
1. Run `deft <group>` to list commands, or `deft find "<what you want>"` to search. If it says `no command does this`, use another tool.
2. Run `deft <group> <command> --help` for options and examples.
3. `deft convert <in> -o <out.ext>` converts between formats by extension.
4. Results are one line starting with `ok`, `partial` or `error`; add `--json` to parse them. Errors include a `hint:` with the fix.

Inputs are never overwritten; pass `--force` or `--in-place` to allow it. Globs and directories work as inputs; several inputs run in parallel.

If `deft` is not installed, ask the user, then follow https://github.com/firstprayer/deft/blob/main/docs/INSTALL.md