Make use of Two-Pass when you are targeting on a specific output file size where the Quality of the file doesn’t matter. It is advisable to use the slowest preset.Ĭurrent presets in descending order of speed are: ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow, placebo. Similarly, for constant quality encoding, you will simply save bitrate by choosing a slower preset.

So, while targeting on a certain file size of constant bit rate, with slower preset you can achieve better quality. Slower the preset, better the compression.

A preset is a collection of options that will provide a certain encoding speed. Preset is used to set an encoding speed to the compression ratio. With max file size Quality Quality with min size The range is exponential, so increasing the CRF value +6 is roughly half the bitrate/filesize while -6 is roughly twice the bitrate/filesize. It is very important to note that there is a trade off between quality and the file size. If the output file size is at higher end then set a higher CRF If the output is not of good quality then set a lower CRF 23 and change it as per the output requirement. In the beginning, let’s start with the default value i.e.

Ffmpeg crf example