Target Quality

Target Quality --target-quality

Target a VMAF score for encoding.

For each chunk, Target Quality searches for the quantizer/crf needed to achieve a certain VMAF score. Target Quality mode is much slower than normal encoding, but can improve the consistency of quality in some cases.

The VMAF score range is 0-100 where 0 is the worst quality and 100 is the best.

Possible Values

Any float value between 0 and 100.

Examples

• > av1an -i input.mkv -o output.mkv --target-quality 80 - Target a VMAF score of 80
• > av1an -i input.mkv -o output.mkv --target-quality 90.5 - Target a VMAF score of 90.5

Probes --probes

Maximum number of probes allowed for Target Quality.

Possible Values

Can be any positive integer.

Default

If not specified, 4 is used.

Probing Rate --probing-rate

Framerate for probes.

Possible Values

Can be any integer from 1 to 4.

Default

If not specified, 1 is used.

Probe Slow --probe-slow

Use encoding settings for probes specified by --video-params rather than faster, less accurate settings.

Note that this always performs encoding in one-pass mode, regardless of --passes.

Minimum Quantizer --min-q

Lower bound for Target Quality Quantizer-search early exit.

If the minimum quantizer is tested and the probe's VMAF score is lower than the Target Quality (--target-quality), the Quantizer-search exits early and the minimum quantizer is used for the chunk.

Possible Values

Depends on the encoder.

Default

If not specified, the default value is used (chosen per encoder).

Maximum Quantizer --max-q

Upper bound for Target Quality Quantizer-search early exit.

If the maximum quantizer is tested and the probe's VMAF score is higher than the Target Quality (--target-quality), the Quantizer-search exits early and the maximum quantizer is used for the chunk.

Possible Values

Depends on the encoder.

Default

If not specified, the default value is used (chosen per encoder).