forVideoAspectRatio
s = MediaString::forVideoAspectRatio(format.u.raw_video.pixel_width_aspect,
s = MediaString::forVideoAspectRatio(format.u.raw_video.pixel_width_aspect,
s << (empty ? "" : ", ") << forVideoAspectRatio(format.pixel_width_aspect,
static BString forVideoAspectRatio(