ffmpeg marquee

marquee for TV broadcast may be done with ffmpeg as well. some ref as below.

Loop text that wipes left to right using FFMPEG drawtext filter

http://superuser.com/questions/875058/loop-text-that-wipes-left-to-right-using-ffmpeg-drawtext-filter/1026470#1026470

Scrolling from RIGHT to LEFT in ffmpeg / drawtext

http://superuser.com/questions/1026763/scrolling-from-right-to-left-in-ffmpeg-drawtext