القائمة
Convert media files between formats - video containers, audio formats, and codec transcoding
التثبيت باستخدام Codex أو Claude انسخ هذا Prompt والصقه في Codex أو Claude أو مساعد آخر ليراجع صفحة Skill ويثبّتها لك.
استنادا إلى تصنيف SOC المهني
SkillsBench contribution workflow. Use when: (1) Creating benchmark tasks, (2) Understanding repo structure, (3) Preparing PRs for task submission.
SkillsBench task authoring — walk a contributor from idea to submission-ready task following CONTRIBUTING.md and the task-implementation rubric. Use when the user wants to create a new SkillsBench task, scaffold a task from an existing workflow (notebook, Excel workbook, document, dataset), convert a prompt or a benchmark item into a SkillsBench task, write skills for a task, or prepare a SkillsBench PR. Pairs with `task-review` (run that as a self-check before submitting).
SkillsBench task PR review — classifies the task track (standard / research / multimodal), runs static policy checks against the track-specific rubric, benchmarks the task across oracle plus Claude and Codex (with and without skills), audits trajectories for cheating and skill invocation, and produces a `pr-N-task-timestamp-run.txt` review report alongside a `prN.zip` bundle of trajectories. Use when reviewing a SkillsBench task PR (by number, branch, or local task path), when the user asks to review a task, run benchmarks on a PR, audit a submission, classify a task as research or multimodal track, or prepare a comment to post on a SkillsBench PR.
Methodology for clause-by-clause review of a contract against a structured deviation policy ("playbook"). Covers how to walk a playbook, locate the matching provision in the contract, apply rule types (max-value, must-be-present, must-be-absent, acceptable-set, must-have-feature), classify the result (ok / risk / reject), choose the prescribed action, and ground each finding in a verbatim excerpt. Use whenever reviewing any contract — NDA, MSA, vendor DD questionnaire, lease, DPA — against a structured rules-based playbook.
Reference for the standard clauses found in commercial non-disclosure agreements (mutual and one-way) — what each clause does, the surface forms it appears in, and how to recognise it in unfamiliar drafting. Use when reviewing, comparing, or extracting provisions from any confidentiality / NDA / mutual NDA / standstill-and-confidentiality agreement.
Read Microsoft Excel (.xlsx) files robustly with `openpyxl` (or `pandas`). Covers multi-sheet workbooks, header rows, empty cells, merged cells, comma-separated list cells, and converting a sheet to a list-of-dicts the rest of your code can consume. Use when a task input or reference document is an `.xlsx` file rather than JSON/CSV.
| name | ffmpeg-format-conversion |
| description | Convert media files between formats - video containers, audio formats, and codec transcoding |
Convert media files between different formats and containers.
# Convert container format (re-encode)
ffmpeg -i input.avi output.mp4
# Copy streams without re-encoding (fast, no quality loss)
ffmpeg -i input.mp4 -c copy output.mkv
# Convert with specific codec
ffmpeg -i input.mp4 -c:v libx264 -c:a aac output.mp4
# H.264
ffmpeg -i input.mp4 -c:v libx264 output.mp4
# H.265 (better compression)
ffmpeg -i input.mp4 -c:v libx265 output.mp4
# VP9 (web optimized)
ffmpeg -i input.mp4 -c:v libvpx-vp9 output.webm
# AV1 (modern codec)
ffmpeg -i input.mp4 -c:v libaom-av1 output.mp4
# MP3
ffmpeg -i input.wav -acodec libmp3lame -q:a 2 output.mp3
# AAC
ffmpeg -i input.wav -c:a aac -b:a 192k output.m4a
# Opus (best quality/bitrate)
ffmpeg -i input.wav -c:a libopus -b:a 128k output.opus
# FLAC (lossless)
ffmpeg -i input.wav -c:a flac output.flac
# CRF (Constant Rate Factor) - lower is better quality
ffmpeg -i input.mp4 -c:v libx264 -crf 23 output.mp4
# Bitrate
ffmpeg -i input.mp4 -b:v 2M -b:a 192k output.mp4
# Two-pass encoding (best quality)
ffmpeg -i input.mp4 -c:v libx264 -b:v 2M -pass 1 -f null /dev/null
ffmpeg -i input.mp4 -c:v libx264 -b:v 2M -pass 2 output.mp4
# Encoding speed presets (faster = larger file)
ffmpeg -i input.mp4 -c:v libx264 -preset fast output.mp4
# Options: ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow
# Quality presets
ffmpeg -i input.mp4 -c:v libx264 -preset slow -crf 18 output.mp4
# Convert all MKV to MP4
for f in *.mkv; do
ffmpeg -i "$f" -c copy "${f%.mkv}.mp4"
done
# Convert with re-encoding
for f in *.avi; do
ffmpeg -i "$f" -c:v libx264 -c:a aac "${f%.avi}.mp4"
done
-c copy when possible for speed (no re-encoding)