: Constant Rate Factor. Lower values (e.g., 18-20) mean higher quality; higher values mean smaller files. Experts advise using CRF over bitrate for one-pass web encodes.
ffmpeg -i input.mp4 -c:v libx265 -crf 23 -preset medium -movflags +faststart -c:a aac -b:a 128k output.mp4 Use code with caution. Copied to clipboard
: Ideal for massive libraries like those on Plex or media servers. x265-web
For a standard "WEB-DL" style result that balances speed and quality, use the following FFmpeg baseline:
: Controls the trade-off between encoding speed and compression efficiency. For the web, medium or slow is typically best. : Constant Rate Factor
: Using 10-bit color ( -pix_fmt yuv420p10le ) can significantly reduce "banding" in gradients (like skies), even for 8-bit sources. 3. Why Use x265-Web?
: Critical for web. It moves the metadata (moov atom) to the start of the file so the video begins playing immediately while downloading. 2. Key Web Considerations ffmpeg -i input
: Older hardware and browsers may not support HEVC. Browsers like Chrome and Safari have broad support now, but always check your target audience.