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ffmpeg vp9 encoding settings to produce "yuv420p(tv, progressive)"

I have a webm video that was made (from an h264) using AWS Elastic Transcoder, using the "System preset: Webm VP9 720p" preset. … e.g.: $ ffmpeg -i 1024X76830FpsPhotoJpeg75.mp4 -pix_fmt yuva420p -c:v libvpx-vp9 video.webm ... …