はじめに

インストールから5分以内に最初の動画を圧縮する方法をご紹介します。

Download — Get the installer from our download page.
Install — Run the setup wizard. FFmpeg and all required runtimes are included.
Launch — Open VideoRecompress Studio from the Start menu or desktop shortcut.
Add Videos — Drag and drop files or folders onto the application, or click "Add Files" to browse.
Choose a Preset — Select one of the 7 built-in presets or configure settings manually.
Start — Click "Start Recompression" and monitor progress in real time.

プリセットの使い方

ホームビデオ、コンテンツ制作、監視映像、最大節約など、用途に合ったプリセットを選びましょう。

Preset	Codec	CRF	Best For	Savings
スマホアーカイブ	H.265	23	Home videos from phones	40-50%
YouTube Raw	H.265	20	Content creators	30-40%
セキュリティアーカイブ	H.265	28	Surveillance footage	50-60%
ウェディングアーカイブ	H.265	18	Wedding videographers	25-35%
最大節約	AV1	35	Maximum compression	55-70%
Quick H.264	H.264	23	Fast, broad compatibility	20-30%
Web最適化	VP9	30	Web content	45-55%

手動設定

コーデック、CRF、オーディオ、字幕、ハードウェアアクセラレーション設定を細かく調整して完全に制御。

Codec Selection

Choose between H.264 (widest compatibility), H.265/HEVC (best balance of quality and size), AV1 (highest compression efficiency), or VP9 (open-source, web-friendly). Each codec offers different tradeoffs between encoding speed, file size, and playback compatibility.

CRF Slider

The Constant Rate Factor (CRF) controls quality. Lower values mean higher quality and larger files. Typical ranges: 18-23 for high quality, 24-28 for balanced, 29-35 for aggressive compression. The slider provides real-time estimated savings.

Audio Options

Audio streams can be copied as-is (fastest, no quality loss) or re-encoded. Copying is recommended unless you need to reduce audio bitrate or change the audio codec.

Subtitle Handling

Subtitle streams are preserved by default during recompression. Text-based subtitles (SRT, ASS) are copied directly. Bitmap subtitles (PGS, VobSub) are handled according to the output container format.

Output Directory

Choose where recompressed files are saved. By default, output files are placed in a subfolder next to the originals. You can also specify a custom output directory for all processed files.

バッチ処理

フォルダを追加し、ワーカー数を設定して、キューに動画ライブラリ全体を一晩で処理させましょう。

Multi-Worker Queue

The application processes multiple videos simultaneously using a worker queue. Software encoding defaults to 1-2 workers (since FFmpeg itself uses multiple CPU cores). Hardware encoding supports 2-3 concurrent workers for maximum GPU utilization.

Pause, Resume, and Cancel

You can pause the entire queue at any time and resume later. Individual jobs can be cancelled without affecting the rest of the queue. Pausing does not corrupt partially encoded files.

Progress Tracking

Each file shows a real-time progress bar based on frame count. The dashboard provides an overview of total progress, estimated time remaining, and cumulative space savings across the entire batch.

Hardware Acceleration

GPUを自動検出して超高速エンコード。互換性のあるハードウェアがない場合はソフトウェアにフォールバック。

GPU Vendor	Technology	H.264	H.265	AV1	VP9
NVIDIA	NVENC	h264_nvenc	hevc_nvenc	av1_nvenc	—
Intel	QSV	h264_qsv	hevc_qsv	av1_qsv	vp9_qsv
AMD	AMF	h264_amf	hevc_amf	av1_amf	—

Automatic Fallback

If hardware encoding fails or is unavailable, the application automatically retries with the corresponding software encoder (libx264, libx265, libsvtav1, or libvpx-vp9). This happens transparently — you never see the failure. Every file completes regardless of GPU availability.

コマンドラインインターフェース

CLIツールでスクリプト、スケジュールタスク、CI/CDパイプラインから動画再圧縮を自動化。

Basic Usage

VideoRecompressStudio.CLI --input <directory> --preset phone_archive --output <directory>

Available Options

Option	Description
`--input <path>`	Input directory to scan for video files (recursive)
`--output <path>`	Output directory for recompressed files
`--preset <name>`	Use a built-in preset: phone_archive, youtube_raw, security_archive, wedding_archive, max_savings, quick_h264, web_optimized
`--codec <codec>`	Video codec: h264, h265, av1, vp9
`--crf <value>`	CRF quality value (0-51, lower = higher quality)
`--workers <n>`	Number of concurrent encoding workers
`--help`	Display all available options

Examples

# Compress home videos with the Phone Archive preset
VideoRecompressStudio.CLI --input "D:\Videos\Phone" --preset phone_archive --output "D:\Videos\Compressed"

# Use AV1 with custom CRF for maximum savings
VideoRecompressStudio.CLI --input "E:\SecurityCam" --codec av1 --crf 32 --output "E:\Archive"

# Process with 3 hardware-accelerated workers
VideoRecompressStudio.CLI --input "D:\Projects" --preset youtube_raw --workers 3 --output "D:\Encoded"

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