"-i", "pipe:", "-loop_input",
//strprintf("-metadata title=\"%s\"", get_canvas()->get_name().c_str()).c_str(),
"-vcodec", video_codec.c_str(),
"-i", "pipe:", "-loop_input",
//strprintf("-metadata title=\"%s\"", get_canvas()->get_name().c_str()).c_str(),
"-vcodec", video_codec.c_str(),