scale_vt - FFmpeg 8.1 / Filters / VideoToolbox Video

Scale and convert the color parameters using VTPixelTransferSession.

The filter accepts the following options:

w, h: Set the output video dimension expression. Default value is the input dimension.
color_matrix: Set the output colorspace matrix.
color_primaries: Set the output color primaries.
color_transfer: Set the output transfer characteristics.

Examples

Perform HDR to SDR conversion, and scale to half size of input

ffmpeg -hwaccel videotoolbox \
        -hwaccel_output_format videotoolbox_vld \
        -i hdr.mov \
        -c:v hevc_videotoolbox \
        -profile:v main \
        -b:v 3M \
        -vf scale_vt=w=iw/2:h=ih/2:color_matrix=bt709:color_primaries=bt709:color_transfer=bt709 \
        -c:a copy \
        -tag:v hvc1 \
        sdr.mp4