How do you reduce video from 1920x1080 [or 720] to low res for letting someone see sample of the movie. How low should it be to prevent it being used without permission
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Last edited by David Banner; 18th Apr 2019 at 12:19.
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Just drop the file into Virtualdub2. You'll see immediately whether it's one or the other
and if the result is what you expect -
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Last edited by David Banner; 19th Apr 2019 at 08:29.
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Something like:
Code:ffmpeg -i input.mp4 -vf scale=w=160:h=90 output.mp4
Code:ffmpeg -i input.mp4 -vf scale=w=160:h=90 -c:v libx264 -preset slow -x264opts crf=18:keyint=1 -c:a copy output.mp4
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Oops, I copied the text from a batch file I was using and I just noticed that I had keyint=1 . You probably don't want that. Just remove it.
Code:ffmpeg -i input.mp4 -vf scale=w=160:h=90 -c:v libx264 -preset slow -x264opts crf=18 -c:a copy output.mp4
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Bellow script use ffplay to visualize how it will look - text 'watermark' is placed at random position over video for 55 frames with 60 frames intervals.
Code:@set filename=%1 @ffplay -loop -1 -hide_banner -loglevel 8 -an -sn -i "%filename%" -vf "drawtext=fontfile=Orbitron.ttf:fontsize=120:fontcolor=gray@0.15:text='watermark':x=if(eq(mod(n\,60)\,0)\,rand(0\,(w-text_w))\,x):y=if(eq(mod(n\,60)\,0)\,rand(0\,(h-text_h))\,y):enable=lt(mod(n\,60)\,55)"
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Actually, you can just cut a certain video clip from the whole vdieo since you just use it as a sample movie. If you insist on reducing resolution, multiple options are available. Just resort to some professional video converters, most of which have this feature to let you lower the resolution and add some watermarks to your movie.
Google it and have a try. It's damn easy.
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