Evals / video / See inside a video

Grab one frame

Save the frame at 5 seconds in bunny.mp4 as frame.jpg.

The task

The reference answer shows the job can be done with deft. It is not an agent run.

deft video frames bunny.mp4 --at 5 -o frame.jpg

Input

bunny.mp4 946.5 KB · h264 1280x720, 10.0s

Reference output

frame.jpg 235.5 KB · 1280x720
frame.jpg
How a result is judged (1 check)
  • image: file = "frame.jpg", format = "JPEG", width = 1280

Runs

CodexWithout deftPassed2026-11-07

Time
7s
New tokens
4.1k
Total input
27.9k
Output tokens
0.2k
Commands
1
Failed
0

Trace

  1. I’ll extract the frame at 5 seconds from `bunny.mp4` and save it as `frame.jpg` in the current directory.

  2. ffmpeg -ss 5 -i bunny.mp4 -frames:v 1 -q:v 2 frame.jpg
    output
    ffmpeg version 7.1.1 Copyright (c) 2000-2025 the FFmpeg developers
      built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
      configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/7.1.1_1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
      libavutil      59. 39.100 / 59. 39.100
      libavcodec     61. 19.101 / 61. 19.101
      libavformat    61.  7.100 / 61.  7.100
      libavdevice    61.  3.100 / 61.  3.100
      libavfilter    10.  4.100 / 10.  4.100
      libswscale      8.  3.100 /  8.  3.100
      libswresample   5.  3.100 /  5.  3.100
      libpostproc    58.  3.100 / 58.  3.100
    Input #0, mov,mp4,m4a,3
    … 2198 more characters
  3. Saved the frame at 5 seconds as [frame.jpg](frame.jpg).

Output

frame.jpg 235.5 KB · 1280x720
frame.jpg

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

Time
17s
New tokens
5.7k
Total input
87.0k
Output tokens
0.5k
Commands
5
Failed
0

Trace

  1. I’ll inspect the available media tools and the video file, then extract the frame at 5 seconds to `frame.jpg` in this directory.

  2. pwd && rg --files -g 'bunny.mp4' -g 'AGENTS.md' -g 'SKILL.md'
    output
    bunny.mp4
  3. The video is present. I’m applying the local `deft` workflow for video frame extraction and will save the still at the requested timestamp.

  4. 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
  5. deft video frames --help
    output
    deft video frames - Save frames as images: --fps 1 or --at 0:05,0:10
    
    Usage: deft video frames <video>... [-o <dir>] [options]
    In: video (each handled separately)   Out: png|jpg files in <name>-frames/
    
    Options:
      --fps <number>               Frames per second
      --interval <time>            Time between frames, such as 2 or 0:30
      --from <time>                Start time for --fps or --interval (default 0)
      --at <times>                 Exact times
      --to <png|jpg>               Image format (default jpg)
    Common: -o --force --dry-run --json -j   (deft help common)
    
    Examples:
      deft video frames clip.mp4 --at 0:01 -o shots/
      deft video frames clip.mp4 --fps 1 --to png -o frames/
      deft video frames clip.mp4 --from 1 --interval 2 -o frames/
    
    Result fields: files
    Needs: ffmpeg, ffprobe
  6. deft video frames bunny.mp4 --at 0:05 --to jpg -o .
    output
    ok video.frames bunny.mp4 -> ./bunny-001.jpg  1 frame  0.19s
  7. mv bunny-001.jpg frame.jpg && ls -l frame.jpg
    output
    -rw-r--r--@ 1 user  staff  103458 Nov  6 17:29 frame.jpg
  8. Saved the frame at 5 seconds as [frame.jpg](frame.jpg).

Output

frame.jpg 101.0 KB · 1280x720
frame.jpg

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

Time
9s
New tokens
5.2k
Total input
45.8k
Output tokens
0.2k
Commands
2
Failed
0

Trace

  1. I’ll use the local `deft` video frame extraction command and save the 5-second frame as `frame.jpg` in the current 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 frames bunny.mp4 -o frame.jpg --at 0:05
    output
    ok video.frames bunny.mp4 -> frame.jpg  1 frame  0.22s
  4. Saved the frame at 5 seconds as [frame.jpg](frame.jpg).

Output

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

Claude Opus 5.5Without deftPassed2026-11-07

Time
11s
New tokens
10.1k
Total input
43.8k
Output tokens
0.5k
Commands
0
Failed
0

Trace

    Output

    frame.jpg 235.5 KB · 1280x720
    frame.jpg

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

    Time
    15s
    New tokens
    9.8k
    Total input
    59.2k
    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
      
      frame.jpg 235.5 KB · 1280x720
      frame.jpg

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