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I'm trying to figure out how this works, but I couldn't find the final solution.

ffmpeg -i input -i overlayvideo \
-filter_complex \
"[0:v] setpts=PTS-STARTPTS [v01]; \
[1:v] setpts=PTS-STARTPTS [gradient]; \
[2:v] drawtext=fontfile=...font.ttf: text='Test': fontcolor=white:fontsize=54: [email protected]:shadowx=4:shadowy=2: \
box=1: [email protected]:boxborderw=10:x='310':y='350',format=yuva444p,fade=t=in:st=1:d=1:alpha=1,fade=t=out:st=7:d=1:alpha=1, setpts=PTS-STARTPTS[v1][txt]; \
[v01][gradient] overlay [v02]; \
[v02][txt] overlay=[outv]" \
-c:v libx264 -profile:v main -level:v 3.1 -pix_fmt yuv420p -c:a aac -map [outv] \
-f mp4 -y 'output.mp4'

The error message: No output pad can be associated to link label 'txt'. Error initializing complex filters. Invalid argument*

I've studied these solutions, but for the time being, I don't understand where I made the mistake.

https://stackoverflow.com/questions/47322739/ffmpeg-overlay-multiple-fading-texts-with-different-colors

https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20input%20videos

What have I forgotten why the output is not good? Thank you for your advice and help.

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1 Answer 1

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You only have two inputs, so 2:v can't exist. Instead, you'll need a base canvas to draw the text upon. I've used the color source filter for that. And you probably want that canvas to be the same size as the video. I've used scale2ref for that. 

ffmpeg -i input -i overlayvideo \
-filter_complex \
"[0:v] setpts=PTS-STARTPTS [v01]; \
[1:v] setpts=PTS-STARTPTS [gradient]; \
color=black@0:duration=8,format=yuva444p[txtbase];[txtbase][v01]scale2ref[txtbase][v01];[txtbase] drawtext=fontfile=...font.ttf: text='Test': fontcolor=white:fontsize=54: [email protected]:shadowx=4:shadowy=2: \
box=1: [email protected]:boxborderw=10:x='310':y='350',fade=t=in:st=1:d=1:alpha=1,fade=t=out:st=7:d=1:alpha=1[txt]; \
[v01][gradient] overlay [v02]; \
[v02][txt] overlay[outv]" \
-c:v libx264 -profile:v main -level:v 3.1 -pix_fmt yuv420p -c:a aac -map [outv] \
-f mp4 -y 'output.mp4'
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  • I've added -map 0:a because I want to use sound of main (input) video file. The timing of the text is still mysterious, but I'll keep under testing. Otherwise it works well, thanks @Gyan!
    – Chili
    Jan 14, 2019 at 17:31
  • Hello Mr. @Gyan I am using this command to overlay into videos ffmpeg -y -i input.mp4 -i overlay.png -filter_complex overlay=0:0 -strict -2 -c:a copy -flags +global_header -qscale:v 3 output.mp4 When sending on iphone the audio is muted problem give the solution regarding this command Thank you
    – Patel Milan
    Sep 8, 2022 at 12:18

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