How to do video overlays on another video | Film overlay advanced
Today, we show advanced options to how to overlay a video on another video, so that you can combine 2 films into 1! All parameters can be customized to suit your own needs so that you create the film of your dreams. Note that this video is a follow up to a previous video will demonstrating the basics overlay features. This previous video is available here:
More overlay "basic" options?
• How to overlay a video on another vid...
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EXAMPLES
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❶ (Resized) Video on top of another video. Mixing audio.
→ ffmpeg -i input01.mp4 -i input02.mp4 -filter_complex ""[1:v]scale=640:360[top];[0:v][top]overlay[out];[0:a][1:a]amix=duration=longest,dynaudnorm [outa]"" -map [out] -map [outa] output01.mp4
with:
-i input01.mp4 = Reads file «input01.mp4» and …
-i input02.mp4 = … file «input02.mp4»…
-filter_complex = … and starts a series of complex filters…
[1:v]scale=640:360[top] = … starting by rescaling the 2nd video “input02.mp4” ([1:v]) to size 640x360 calling the result [top]…
[0:v][top]overlay[out] = … and overlaying thereafter, the resized video ([top]) on top of the 1st input video “input01.mp4” ([0:v]).
[0:a][1:a]amix=duration=longest = Mixes now audio 1 ([0:a]) & audio 2 ([1:a])…
dynaudnorm = … dynamically re-adjusting the gain factor of the audio, …
[outa] = … calling the resulting audio [outa].
-map [out] -map [outa] = Stitches now back together the resulting modified video [out] and the audio [outa]…
output01.mp4 = … and outputs the result to file «output01.mp4»
❷ (Resized) Video on top of another video. Mixing audio. Delayed overlay.
→ ffmpeg -i input01.mp4 -i input02.mp4 -filter_complex ""[1:v]scale=640:360,setpts=PTS+1/TB[top];[0:v][top]overlay=200:200[out];[1:a]adelay=1000|1000[a1];[0:a][a1]amix=duration=longest,dynaudnorm[outa]"" -map [out] -map [outa] output02.mp4
with:
-i input01.mp4 = Reads file «input01.mp4» and …
-i input02.mp4 = … file «input02.mp4»…
-filter_complex = … and starts a series of complex filters…
[1:v]scale=640:360 = … starting by rescaling the 2nd video “input02.mp4” ([1:v]) to size 640x360…
setpts=PTS+1/TB[top] = … and setting the Presentation TimeStamp (PTS) to start after 1 second, calling the result [top].
[0:v][top]overlay=200:200[out] = Overlays now the resized video ([top]) on top of the 1st input video “input01.mp4” ([0:v]) at position x=200, y=200.
[1:a]adelay=1000|1000[a1] = Delays the stereo audio from “input02.mp4” ([1:a]) by 1 second…
[0:a][a1]amix=duration=longest,dynaudnorm[outa] = … and mixes the result with “input01.mp4” ([0:a]) normalizing the output and calling the result [outa].
-map [out] -map [outa] = Stitches now back together the resulting modified video [out] and the audio [outa]…
output02.mp4 = … and outputs the result to file «output02.mp4»
❸ (Resized) Video on top of another video. Mixing audio. Delayed overlay. Moving overlay.
→ ffmpeg -i input01.mp4 -i input02.mp4 -filter_complex ""[1:v]scale=640:360,setpts=PTS+1/TB[top];[0:v][top]overlay=(t-1)*64:(t-1)*36[out];[1:a]adelay=1000|1000[a1];[0:a][a1]amix=duration=longest,dynaudnorm[outa]"" -map [out] -map [outa] output03.mp4
with:
-i input01.mp4 = Reads file «input01.mp4» and …
-i input02.mp4 = … file «input02.mp4»…
-filter_complex = … and starts a series of complex filters…
[1:v]scale=640:360,setpts=PTS+1/TB[top] = … starting by rescaling the 2nd video “input02.mp4” ([1:v]) to size 640x360 and delaying its PTS by 1 second…
[0:v][top]overlay = Overlays now the resized video ([top]) on top of the 1st input video “input01.mp4” ([0:v])…
(t-1)*64:(t-1)*36[out] = … moving it, after 1 second and every second (t), by 64 pixels horizontally / 36 pixels vertically.
[1:a]adelay=1000|1000[a1] = Delays the stereo audio from “input02.mp4” ([1:a]) by 1 second…
[0:a][a1]amix=duration=longest,dynaudnorm[outa] = … and mixes the result with “input01.mp4” ([0:a]) normalizing the output and calling the result [outa].
-map [out] -map [outa] = Stitches now back together the resulting modified video [out] and the audio [outa]…
output03.mp4 = … and outputs the result to file «output03.mp4»
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