| Option | ffmpeg_variable_bitrate |
| Type | Integer |
| Range | 0, 2 - 31 |
| Default | 0 (disabled) |
| Description | Enables and defines variable bitrate for the ffmpeg encoder. ffmpeg_bps is ignored if variable bitrate is enabled. Valid values: 0 (default) = fixed bitrate defined by ffmpeg_bps, or the range 2 - 31 where 2 means best quality and 31 is worst. |
| Group | Movie File Output |