extract-audio-from-video

从视频文件中提取音频并保存为MP3。当用户希望批量将视频文件（MP4）转换为音频（MP3）时使用。可通过“从视频中提取音频”“将视频转换为MP3”“从视频文件中保存音频”，或任何涉及批量从视频文件中提取音频的任务来触发。

name: extract-audio-from-video description: "Extract audio from video files and save as MP3. Use when the user wants to convert video files (MP4) to audio (MP3) in batch. Triggers on requests like: extract audio from videos, convert videos to mp3, save audio from video files, or any task involving batch audio extraction from video files in a directory."

Extract Audio from Video

Overview

Extracts audio tracks from MP4 video files and saves them as MP3 files in a separate output directory. Handles all files automatically in one command - no manual re-runs needed.

One-Command Usage

When the user requests audio extraction, run this SINGLE command:

bash

nohup bash /home/rlan/projects/improved-ai-agent/skills/extract_audio_from_video/scripts/extract.sh "/path/to/videos" "/path/to/audios" > /tmp/audio_extraction.log 2>&1 &

Replace /path/to/videos and /path/to/audios with actual paths. The script runs in background and processes ALL files automatically.

Parameters

Parameter	Value
Input format	MP4 only
Output format	MP3 (libmp3lame)
Quality	VBR ~190kbps (`-q:a 2`)
Skip behavior	Skip if MP3 exists

How It Works

•nohup + & - Runs script in background, survives tool timeout
•Automatic loop - Script loops until all files processed
•Skip existing - Already-processed files are skipped on re-run
•Progress - Check with tail /tmp/audio_extraction.log

Verification

After completion (or during), check:

bash

echo "Videos: $(ls /path/to/videos/*.mp4 | wc -l)"
echo "Audios: $(ls /path/to/audios/*.mp3 | wc -l)"
du -sh /path/to/audios

Or monitor progress:

bash

tail -f /tmp/audio_extraction.log