Put a watermark on a video

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

Time

18s

New tokens

5.5k

Total input

72.9k

Output tokens

0.4k

Commands

4

Failed

0

Trace

1. I’ll check the available video tools and the clip’s dimensions, then add “SAMPLE” as a bottom-right overlay for the full duration and save `marked.mp4` here.

2. cat .agents/skills/deft/SKILL.md; rg --files -g 'bunny.mp4' -g 'AGENTS.md' -g 'deft*' .
   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
   … 740 more characters

3. I found the `deft` file tools and will use them for the video edit, as its workflow specifies.

4. 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

5. deft video watermark --help && deft video info bunny.mp4
   output

   deft video watermark - Add text or a logo: --text, --image, --position
   
   Usage: deft video watermark <video>... [-o <video|dir>] [options]
   In: video (each handled separately)   Out: video (default <name>.watermarked.<ext>)
   Any script works; text uses the fonts on this machine.
   
   Options:
     --text <text>                Text to add
     --image <path>               Logo or picture to add
     --opacity <n>                Opacity in percent (default 70)
     --position <position>        Where on the frame (default bottom-right)
     --color <color>              Text color (default white)
     --font-size <number>         Text size in pixels (default: 5% of the height)
     --font <text>                Font family
     --scale <number>             Logo width as a fraction of the frame width (default 0.2)
   Common: -o --force --dry-run --json -j   (deft help common)
   
   Examples:
     deft video watermark clip.mp4 --text Sample -o marked.mp4
     deft video watermark clip.mp4 --image logo.png --position top-left -o branded.mp4
   Needs: ffmpeg, ffprobe
   ok video.info bunny.mp4  0:10, 1280x720
   duration=10.0 width=1280 height=720 fps=30.0 video_codec=h264 bitrate=775360

6. deft video watermark bunny.mp4 --text SAMPLE --position bottom-right -o marked.mp4
   output

   ok video.watermark bunny.mp4 -> marked.mp4  1.9MB  0.87s

7. Added “SAMPLE” at the bottom right for the full video. Saved as [marked.mp4](marked.mp4).

Output

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

Time

18s

New tokens

6.4k

Total input

76.7k

Output tokens

0.5k

Commands

4

Failed

0

Trace

1. I’ll inspect the local video tools, then use the available media workflow to add the label for the full duration and save `marked.mp4` in this directory.

2. deft video
   output

   deft video - commands (input -> output)
     info               video -> report      Duration, size, frame rate, codecs
     add-subtitles      video -> video       Add subtitles: burned into the picture, or --soft
     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
     extract-subtitles  video -> srt|vtt     Save an embedded subtitle track: --to srt|vtt
     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
     watermark          video -> video       Add text or a logo: --text, --image, --position
   More: deft video <command> --help

3. ls -l bunny.mp4
   output

   -rw-r--r--@ 1 user  staff  969201 Nov  4 19:32 bunny.mp4

4. deft video watermark --help
   output

   deft video watermark - Add text or a logo: --text, --image, --position
   
   Usage: deft video watermark <video>... [-o <video|dir>] [options]
   In: video (each handled separately)   Out: video (default <name>.watermarked.<ext>)
   Any script works; text uses the fonts on this machine.
   
   Options:
     --text <text>                Text to add
     --image <path>               Logo or picture to add
     --opacity <n>                Opacity in percent (default 70)
     --position <position>        Where on the frame (default bottom-right)
     --color <color>              Text color (default white)
     --font-size <number>         Text size in pixels (default: 5% of the height)
     --font <text>                Font family
     --scale <number>             Logo width as a fraction of the frame width (default 0.2)
   Common: -o --force --dry-run --json -j   (deft help common)
   
   Examples:
     deft video watermark clip.mp4 --text Sample -o marked.mp4
     deft video watermark clip.mp4 --image logo.png --position top-left -o branded.mp4
   Needs: ffmpeg, ffprobe

5. The video is present, and `deft` has a text watermark command with bottom-right as its default placement. I’m applying it across the video and writing the requested output file.

6. The watermark job is still running; I’m waiting for it to finish before confirming the file.

7. deft video watermark bunny.mp4 --text SAMPLE --position bottom-right -o marked.mp4
   output

   ok video.watermark bunny.mp4 -> marked.mp4  1.9MB  2.58s

8. Done. Added “SAMPLE” to the bottom right of the full video and saved it as [marked.mp4](marked.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

19s

New tokens

12.9k

Total input

111.4k

Output tokens

0.9k

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