Usability

Advanced usability options for output. The most frequently used parameters in this section pertain to colorimetry settings, useful when producing output that has to meet a given broadcast colorspace for display on television systems.

Nal-hrd is sometimes required for systems (in particular, some CableLabs variants), where a hard constant bitrate must be observed and reported in the data stream.

Parameter	Description	Allowed Values	Default Value
videoformat	Indicates what the video was before encoding/digitizing.	component pal ntsc secam mac undef	undef
colorprim	Set what color primaries for converting to RGB.	bt709 bt470m bt470bg smpte170m smpte240m film bt2020 undef	undef
transfer	Set the opto-electronic transfer characteristics to use. (Sets the gamma curve to use for correction.)	bt709 bt470m bt470bg smpte170m smpte240m linea log100 log316 iec61966-2-4 bt1361e iec61966-2-1 bt2020-10 bt2020-12 undef	undef
colormatrix	Set the matrix coefficients used in deriving the luma and chroma from the RGB primaries.	bt709 fcc bt470bg smpte170m smpte240m GBR YCgCo bt2020nc bt2020c undef	none
nal-hrd	Signal HRD information	none vbr cbr	none
afd	Active Format Description field value	16x9_top 14x9_top gt_16x9 coded_frame 4x3_centre 16x9_centre 14x9_centre 4x3_as_14x9 16x9_as_14x9 16x9_as_4x3	none
hide_encoding_settings	Remove encoding settings from h264 bitstream	yes, no	no