development <<< video
  1. short names
  2. kdenlive → move and scale png
  3. kdenlive reverse clip
  4. ffmpeg change container that embed into web
  1. short names
  2. kdenlive → move and scale png

    3. -- add clip
    -- drop clip into video track timeline
    -- stretch clip if it not enough long use lmouse push → drag right → drop
    -- rmouse clip on track time line Add Effect → Crop and transform → Position and Zoom
    -- set first keyframe condition, set last keyframe condition
    -- cut frame that no need at last of clip
    --- move position slider to time of clip splitting
    --- Timeline → Current clip → Cut Clip
    --- lmouse on right part and delete Timeline → Current clip → Delete Selected Item
    Better way is create one clip for one action, or can be lags/bugs later
  3. kdenlive reverse clip
    4. Clip jobs -> duplicate clip with speed change -> -100%
  4. ffmpeg change container that embed into web
    5. ffmpeg -i vid.mkv -c copy vid.mp4 . Fast, looks like no need recoding. mkv to webm fail when tested, some of container restrictions. Looks like needed recoding