Encoding

Encoding

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The Encoding page (/encoding, admin only) controls whether downloads are re-encoded when saved. The default is copy — the stream is taken over 1:1 without quality loss or CPU load (recommended).

Modes

Mode	Description
copy	Keep video untouched (default); optionally convert audio to AAC/AC3
h264	Re-encode to H.264
h265	Re-encode to H.265/HEVC (smaller files, more compute)
expert	Custom FFmpeg flags for video and audio (e.g. -c:v libx265 -preset slow -crf 18)

Hardware acceleration

For h264/h265 you can choose per mode:

Option	Encoder
cpu	libx264 / libx265
nvenc	h264_nvenc / hevc_nvenc (NVIDIA)
vaapi	h264_vaapi / hevc_vaapi (Intel/AMD, Linux)
videotoolbox	h264_videotoolbox / hevc_videotoolbox (macOS)

The Detect hardware button tests the FFmpeg encoders available on your system. Quality is controlled via CRF (default: 23 for H.264, 28 for H.265) plus preset (ultrafast … veryslow); for NVENC, CRF maps to the cq mode, for VAAPI to global_quality.

Audio

Selectable per mode: copy (default), aac or ac3.

Scope

• These settings affect the download (FFmpeg muxing).
• The in-browser player (Library) has its own automatic encoder selection for live HLS transcoding.
• Upscaling has its own output codec settings (Anime4K Upscaling).