How to move a video around | up | down | left | right | Pan a video method 2
Today, we show how to move a video around (left to right, up and down, diagonal) / pan a video using ffmpeg. In this video, the concept behind “moving” a video with ffmpeg is to repeatedly custom crop a larger video to suit a smaller visible frame. All parameters can be customized to move a video right to left, left to right, up to down, down to up...
Another method to pan / move a video around using the "overlay" filter can be found here:
• How to pan a static video | Dynamic v...
EXAMPLES
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❶ Horizontal move: left - right
→ ffmpeg -i input.mp4 -vf "crop=in_w*0.90:in_h*0.90:(in_w*0.10)/10*t:108,scale=1920:1080" output01.mp4
with:
-i input.mp4 = Reads file «input.mp4» and …
*-vf = … and applies video filters (vf)…
crop = … starting by cutting (crop) a rectangular piece of the video…
in_w*0.90:in_h*0.90 = … that is 90% the size of the original video… (The ffmpeg Guy "Note, in_w = video input width, in_h = video input height")
(in_w*0.10)/10*t = … starting to cut at position x = 0 for t = 0, x = 192 for t = 1, x = 384 at t = 2, ... x = 1920 for t = 10, i. e. moving by 1% video width every (t) seconds…
108 = Cut position on the y axis is constant at 108
scale=1920:1080 = Scales now the cut video (90% of the original size) back to 1920x1080…
output01.mp4 = … and outputs the result to file «output01.mp4»
Note: It kinda works, but the overlay shows a jittery movement (similar to when zooming into a picture with ffmpeg). This will be solved in our next example.
❷ Vertical move: up - down - up (with jitter fix)
→ ffmpeg -i input.mp4 -vf "scale=iw*10:ih*10,crop=in_w*0.90:in_h*0.90:1920:'if(lt(t,5),in_h*0.10/5*t,1080-in_h*0.10/5*(t-5))',scale=hd1080" output02.mp4
with:
-i input.mp4 = Reads file «input.mp4» and …
-vf = … and applies video filters (vf)…
scale=iw*10:ih*10 = … the video is first scaled up to 19200x10800…
crop= = … then a rectangular piece of the video is cut (crop)…
in_w*0.90:in_h*0.90 = … that is 90% the size of the scaled up video.
1920 = Cut position on the x axis is constant at 1920.
'if(lt(t,5),in_h*0.10/5*t,1080-in_h*0.10/5*(t-5))' = Cut position on the y axis starts at 0 then: increases by 2% video height for the first 5 (t) seconds, decreases by 2% video height for the last 5 (t) seconds. The ffmpeg Guy "Note that lt is is "lower than", so if(lt(t,5)... means "if t lower than 5, then...")
scale=hd1080 = The video is then scaled down to 1920x1080 (hd1080)…
output02.mp4 = … and outputs the result to file «output02.mp4»
❸ Diagonal move: top left - bottom right - top left (with jitter fix)
→ ffmpeg -i input.mp4 -vf "scale=iw*10:ih*10,crop=in_w*0.90:in_h*0.90:'if(lt(t,5),in_w*0.10/5*t,1920-in_w*0.10/5*(t-5))':'if(lt(t,5),in_h*0.10/5*t,1080-in_h*0.10/5*(t-5))',scale=hd1080" output03.mp4
with:
-i input.mp4 = Reads file «input.mp4» and …
-vf = … and applies video filters (vf)…
scale=iw*10:ih*10 = … the video is first scaled up to 19200x10800…
crop = … then a rectangular piece of the video is cut (crop)…
in_w*0.90:in_h*0.90 = … that is 90% the size of the scaled up video.
'if(lt(t,5),in_w*0.10/5*t,1920-in_w*0.10/5*(t-5))' = Cut position on the x axis starts at 0 then: increases by 2% video width for the first 5 (t) seconds, decreases by 2% video width for the last 5 (t) seconds.
'if(lt(t,5),in_h*0.10/5*t,1080-in_h*0.10/5*(t-5))' = Cut position on the y axis starts at 0 then: increases by 2% video height for the first 5 (t) seconds, decreases by 2% video height for the last 5 (t) seconds.
scale=hd1080 = The video is then scaled down to 1920x1080 (hd1080)…
output03.mp4 = … and outputs the result to file «output03.mp4»
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