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  1. 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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  2. Originally Posted by David Banner View Post
    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
    160 to 320 pixels? IMHO lowest acceptable - perhaps it is better to apply translucent watermark with constantly variable position?
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  3. Originally Posted by David Banner View Post
    How do you reduce video from 1920x1080 [or 720] to low res for letting someone see sample of the movie.
    Every video editor has the ability to reduce the frame size.

    Originally Posted by David Banner View Post
    How low should it be to prevent it being used without permission
    No matter how small you make it anybody can use it without your permission unless you apply some type of digital rights management.
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  4. Originally Posted by jagabo View Post
    Originally Posted by David Banner View Post
    How do you reduce video from 1920x1080 [or 720] to low res for letting someone see sample of the movie.
    Every video editor has the ability to reduce the frame size.

    Originally Posted by David Banner View Post
    How low should it be to prevent it being used without permission
    No matter how small you make it anybody can use it without your permission unless you apply some type of digital rights management.
    ok. i thought it would not be usable under a certain resolution?
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  5. Member
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    Mar 2008
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    Usable for what?
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  6. Originally Posted by pandy View Post
    Originally Posted by David Banner View Post
    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
    160 to 320 pixels? IMHO lowest acceptable - perhaps it is better to apply translucent watermark with constantly variable position?
    what program would best to have the watermark change position?
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  7. Originally Posted by davexnet View Post
    Usable for what?
    to be shown online on a news website. i thought a low res sample could be sent and if they pay the hi res one
    I did 160 to 320 pixels in vegas but it still says 1920x1280 in mediainfo
    Last edited by David Banner; 18th Apr 2019 at 12:19.
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  8. Member
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    Originally Posted by David Banner View Post
    Originally Posted by davexnet View Post
    Usable for what?
    to be shown online on a news website. i thought a low res sample could be sent and if they pay the hi res one
    I did 160 to 320 pixels in vegas but it still says 1920x1280 in mediainfo
    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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  9. Originally Posted by David Banner View Post
    what program would best to have the watermark change position?
    I use ffmpeg for this but others may suggest you something better.
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  10. Originally Posted by davexnet View Post
    Originally Posted by David Banner View Post
    Originally Posted by davexnet View Post
    Usable for what?
    to be shown online on a news website. i thought a low res sample could be sent and if they pay the hi res one
    I did 160 to 320 pixels in vegas but it still says 1920x1280 in mediainfo
    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
    All you have to do is watch the video. The difference between 1920x1080 and 160x90 is obvious.
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  11. Originally Posted by jagabo View Post
    Originally Posted by davexnet View Post
    Originally Posted by David Banner View Post
    Originally Posted by davexnet View Post
    Usable for what?
    to be shown online on a news website. i thought a low res sample could be sent and if they pay the hi res one
    I did 160 to 320 pixels in vegas but it still says 1920x1280 in mediainfo
    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
    All you have to do is watch the video. The difference between 1920x1080 and 160x90 is obvious.
    i know it is not changing. No wonder i was rendering at 1920 seems 480 is the lowest in vegas. There is no render for 160x90
    Last edited by David Banner; 19th Apr 2019 at 08:29.
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  12. Originally Posted by pandy View Post
    Originally Posted by David Banner View Post
    what program would best to have the watermark change position?
    I use ffmpeg for this but others may suggest you something better.
    i have no idea what code to use to do that
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  13. Something like:
    Code:
    ffmpeg -i input.mp4 -vf scale=w=160:h=90 output.mp4
    Of course, you'll probably also want to specify the codec and settings:
    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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  14. Originally Posted by jagabo View Post
    Something like:
    Code:
    ffmpeg -i input.mp4 -vf scale=w=160:h=90 output.mp4
    Of course, you'll probably also want to specify the codec and settings:
    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
    Thanks
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  15. 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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  16. Originally Posted by David Banner View Post
    Originally Posted by pandy View Post
    Originally Posted by David Banner View Post
    what program would best to have the watermark change position?
    I use ffmpeg for this but others may suggest you something better.
    i have no idea what code to use to do that
    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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  17. 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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