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How to correctly add expression to transparent background like on this question ffmpeg drawtext filter - create transparent background with text for my case (where there are 3 lines in bottom right corner):

ffmpeg -i videoin.mp4 -vf "[in]drawtext=enable='between(t,2.5,6.5)':fontsize=50:fontcolor=White:fontfile='ariblk.ttf':text='textline1':x=min(4*(tw\+10)-(abs(4-2*(t-2.5)))*(tw+10)-tw\,10):y=h-th-130, drawtext=enable='between(t,2.5,6.5)':fontsize=50:fontcolor=White:fontfile='ariblk.ttf':text='textline2':x=min(4*(tw\+10)-(abs(4-2*(t-2.5)))*(tw+10)-tw\,10):y=h-th-75, drawtext=enable='between(t,2.5,6.5)':fontsize=50:fontcolor=White:fontfile='ariblk.ttf':text='textline3':x=min(4*(tw\+10)-(abs(4-2*(t-2.5)))*(tw+10)-tw\,10):y=h-th-20[out]" -codec:a copy videoout.mp4
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Use the box options i.e. 

drawtext=enable='between(t,2.5,6.5)':fontsize=50:fontcolor=White:fontfile='ariblk.ttf':text='textline1':x=min(4*(tw\+10)-(abs(4-2*(t-2.5)))*(tw+10)-tw\,10):y=h-th-130:box=1:boxborderw=12:boxcolor=black@0.45

This adds a box with padding of 12 pixels around the text boundary, and the color is black with 45% opacity.

Using drawbox (add it before the drawtexts)

drawbox=y=ih-140:h=110:c=black@0.45:t=max:enable='between(t,2.5,6.5)'

Here's the entire vf expression:

-vf "drawbox=y=ih-140:h=110:c=black@0.45:t=max:enable='between(t,2.5,6.5)',drawtext=enable='between(t,2.5,6.5)':fontsize=50:fontcolor=White:fontfile='ariblk.ttf':text='textline1':x=min(4*(tw\+10)-(abs(4-2*(t-2.5)))*(tw+10)-tw\,10):y=h-th-130, drawtext=enable='between(t,2.5,6.5)':fontsize=50:fontcolor=White:fontfile='ariblk.ttf':text='textline2':x=min(4*(tw\+10)-(abs(4-2*(t-2.5)))*(tw+10)-tw\,10):y=h-th-75, drawtext=enable='between(t,2.5,6.5)':fontsize=50:fontcolor=White:fontfile='ariblk.ttf':text='textline3':x=min(4*(tw\+10)-(abs(4-2*(t-2.5)))*(tw+10)-tw\,10):y=h-th-20" -codec:a copy videoout.mp4
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  • Thx Mulvya, but i was thinking about drawbox so the background can be in full width. With 3 lines that have different number of letters it looks ugly this way. I am using y=h-th-130 up to y=h-th-20 for those 3 lines, so the background should be from around 140 to 10, but in full width, as i might add more text or image over it in right corner later. And from the link in question it looks perfect (not the position but background).
    – Azz Kawa
    Jan 27, 2016 at 14:41
  • Thx Mulvya !. I am getting error "Unable to parse graph description substring. Might be that i am not separating text and box expressions correctly. Starting like this ffmpeg -i videoin.mp4 -vf drawbox=y=ih-140:h=110:c=black@0.45:t=max:enable='between(t,2.5,6.5)': "[in]drawtext=enable='between(t,2.5,6.5)'....etc...
    – Azz Kawa
    Jan 27, 2016 at 16:05

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