How Can I Get These Watermarks To Scale To Fit The Video Parameters?

The ffmpeg works successfully to display watermarks on the video, yet the large watermark image isn’t resizing to fit the video screen:

$ffmpegCommand =”.$ffmpeg_b.’ -y -i ‘.$video_file_full_path.’ -i ‘.$watermark_image_full_path.’ -i ‘.$watermark_image_full_path.’ -filter_complex “scale=640:-2, scale=640:-2, overlay=10:10, overlay=170:170:enable=between(t,5,5+2)” -vcodec libx264 -preset ‘.$pt->config->convert_speed.’ -crf 26 ‘.$video_output_full_path_360.’ 2>&1′;

any assistance/suggestion is appreciated

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