Designed for HTML5, webm uses open source encoders VP9 for video and Opus for audio.

Extension: .webm


Compression Options

A quality slider chooses the encoding quality, or bit rate, the combo below the slider offers 4 types of encoding:

• Constant Bit Rate a fixed bit rate is used through out the encoding,
• Average Bit Rate like Constant Bit Rate except there is some encoding flexibility, on difficult parts a higher bit rate is used, overall though the bit rate averages out to the requested value,
• Constant Quality a desired quality achieved throughout the encoding process, by varying the bit rate, this is the recommended mode for most people.
• Lossless encodes the video without loss of quality, expect the end files to be large, test on players to ensure compatibility.

A quality indicator dictates how much effort goes into encoding at a given preset.