anime_audio_encoder.py is a batch-processing script for MKV files, designed for anime encoding workflows. It automates video encoding (with AV1 via SVT-AV1 and av1an), audio conversion (to Opus with normalization and optional downmixing), and preserves detailed per-file logs. The script also handles VFR-to-CFR conversion using HandBrakeCLI when needed.

Features

Video encoding: Uses UTVideo intermediate, VapourSynth, and AV1 encoding via av1an and SVT-AV1.
Audio processing: Converts non-Opus/AAC tracks to normalized Opus, with optional downmixing for surround audio.
VFR handling: Detects Variable Frame Rate sources and converts to Constant Frame Rate using HandBrakeCLI.
Logging: Creates a log file for each processed MKV in the conv_logs directory.
Cleanup: Moves original files to original/, completed files to completed/, and deletes temporary files.

Requirements

The following tools must be installed and available in your PATH:

ffmpeg
ffprobe
mkvmerge
mkvpropedit
sox
opusenc
mediainfo
av1an
HandBrakeCLI

Usage

Place your .mkv files in the working directory. Run the script:

python3 anime_audio_encoder.py

Optional Arguments

--no-downmix
Preserve original audio channel layout (do not downmix surround audio to stereo).

Example:

python3 anime_audio_encoder.py --no-downmix

Output

Processed files are moved to the completed/ directory.
Originals are moved to the original/ directory.
Per-file logs are saved in the conv_logs/ directory.

Notes

The script will skip files that cannot be decoded by ffmpeg.
Temporary files are cleaned up automatically after processing.
Scene detection and AV1 encoding may take a long time depending on file size and system performance.

License

This project is licensed under the MIT License - see the LICENSE.md file for details.