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
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
I’ll extract the frame at 5 seconds from `bunny.mp4` and save it as `frame.jpg` in the current directory.
ffmpeg -ss 5 -i bunny.mp4 -frames:v 1 -q:v 2 frame.jpgoutput
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
Saved the frame at 5 seconds as [frame.jpg](frame.jpg).
Output

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
I’ll inspect the available media tools and the video file, then extract the frame at 5 seconds to `frame.jpg` in this directory.
pwd && rg --files -g 'bunny.mp4' -g 'AGENTS.md' -g 'SKILL.md'output
bunny.mp4
The video is present. I’m applying the local `deft` workflow for video frame extraction and will save the still at the requested timestamp.
cat .agents/skills/deft/SKILL.mdoutput
--- 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
deft video frames --helpoutput
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
deft video frames bunny.mp4 --at 0:05 --to jpg -o .output
ok video.frames bunny.mp4 -> ./bunny-001.jpg 1 frame 0.19s
mv bunny-001.jpg frame.jpg && ls -l frame.jpgoutput
-rw-r--r--@ 1 user staff 103458 Nov 6 17:29 frame.jpg
Saved the frame at 5 seconds as [frame.jpg](frame.jpg).
Output

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

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

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