ffmpeg_variable_bitrate

• Type: Integer
• Range / Valid values: 0, 2 - 31
• Default: 0 (disabled)
• Group: Output - Movie

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., 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.

Experiment for the value that gives you the desired compromise between size and quality.