VP8
        VP8 is a modern, high quality codec released by Google for WebM. It is comparable to H.264 but is patent and royalty-free.
        
            Options
            
                - 
                    Quality (0 - 10)
 Set a specific visual quality (recommended). Default is 5.
 quality=3.75
 
- 
                    Bitrate (number)
 Set a specific bitrate to control file size. Default is unset.
 bitrate=512000
 
- 
                    Multi-pass mode
 Set the mode of operation for single or multiple passes.
                        - one-pass: single pass encoding (default)
- first-pass: first of two passes
- last-pass: second of two passes
 multipass-mode=one-pass
 
- 
                    Threads
 Use multiple threads when encoding.
 threads=2