Because MP4 files vary in bitrate (1080p, 4K, 60fps), "sone338" might be a benchmark file. Video enthusiasts search for specific encoded files to test:
"sone338mp4" appears to be a specific filename for a Japanese adult video (AV) titled , produced by the studio S1 NO.1 STYLE Key Information Release Date : September 10, 2024 S1 NO.1 STYLE (also known as S1) : Full-length film (approximately 150 minutes) sone338mp4