Usage: gdalbuildvrt [--help] [--long-usage] [--help-general]
                    [--quiet]
                    [[-strict]|[-non_strict]]
                    [-tile_index <field_name>]
                    [-resolution user|average|common|highest|lowest|same]
                    [-tr <xres> <yres>] [-input_file_list <filename>]
                    [[-separate]|[-pixel-function <function>]]
                    [-pixel-function-arg <NAME>=<VALUE>]...
                    [-allow_projection_difference] [-sd <n>] [-tap]
                    [-te <xmin> <ymin> <xmax> <ymax>] [-addalpha] [-b <band>]...
                    [-hidenodata] [-overwrite]
                    [-srcnodata "<value>[ <value>]..."]
                    [-vrtnodata "<value>[ <value>]..."] [-a_srs <srs_def>]
                    [-r nearest|bilinear|cubic|cubicspline|lanczos|average|mode]
                    [-oo <NAME>=<VALUE>]... [-co <NAME>=<VALUE>]...
                    [-write_absolute_path] [-ignore_srcmaskband]
                    [-nodata_max_mask_threshold <threshold>]
                    <vrt_dataset_name> [<src_dataset_name>]...

Note: gdalbuildvrt --long-usage for full help.