How can I make a preview video from a movie?

[master1024]

Hello

I want a way to make 2 minute preview video from a 45 minutes movie (Automatically)

Assume that I have a movie its duration around 43 min, I want to take 3 seconds splits every X times then merge those splits into one file to produce a 2 minute long video.

How could I do this? and with which programs/scripts?
It will be great too if I could do this to multiple files at once (batch)


Thanks in advance

[jagabo]

AviSynth's SelectRangeEvery() will allow you to do such.

[master1024]

AviSynth's SelectRangeEvery() will allow you to do such.

Thanks for your suggestion, I will appreciate a step by step guide, if you have time.

I am totally new to virtualdub and other scripting world.

The function you mentioned seems to do exactly what I am looking for. but what I should do after opening the video file with virtualdub?

[master1024]

Now, I am stuck with this. I created this script file (.avs)

AVISource("D:\My Files\05 Videos\Videotomakeapreview.mp4")
SelectRangeEvery(clip, 3000, 120, 0)

and when I try to run the script in virtualdub, it shows me this message

Error during script execution at line 1, column 10:Variable 'AVISource' not found

Am I on the right track, or I missed something?

[sambat]

Source is an mp4 file?

a=ffvideosource("C:\Users\Superuser\Desktop\Titanic.mp4")
SelectRangeEvery(a, 100, 25, 0)

# to keep the audio
a=audiodub(ffvideosource("C:\Users\Superuser\Desktop\Titanic.mp4"), ffaudiosource("C:\Users\Superuser\Desktop\Titanic.mp4"))
SelectRangeEvery(a, 100, 25, 0)

# download http://code.google.com/p/ffmpegsource/downloads/detail?name=ffms2-2.18-rc1.7z&can=2&q=
# and unzip the file ffms2.dll to the Avisynth/plugins folder.
# Haali splitter may also be required to be installed
# https://www.videohelp.com/tools/Haali-Media-Splitter

[master1024]

Source is an mp4 file?

a=ffvideosource("C:\Users\Superuser\Desktop\Titanic.mp4")
SelectRangeEvery(a, 100, 25, 0)

# to keep the audio
a=audiodub(ffvideosource("C:\Users\Superuser\Desktop\Titanic.mp4"), ffaudiosource("C:\Users\Superuser\Desktop\Titanic.mp4"))
SelectRangeEvery(a, 100, 25, 0)

# download http://code.google.com/p/ffmpegsource/downloads/detail?name=ffms2-2.18-rc1.7z&can=2&q=
# and unzip the file ffms2.dll to the Avisynth/plugins folder.
# Haali splitter may also be required to be installed
# https://www.videohelp.com/tools/Haali-Media-Splitter

I downloaded the ffms and changed the script according to yours but the problem still here,

Variable 'a' not found

What's your advice?

[pandy]

You can use ffmpeg - there are at least 2(3 when fps conversion used) filters capable to do such thing - thumbnail seem to be best for such task, only one case is to create dynamic script where total length for movie can be used to create interval parameter for thumbnail...
https://ffmpeg.org/ffmpeg-filters.html#thumbnail

[master1024]

You can use ffmpeg - there are at least 2(3 when fps conversion used) filters capable to do such thing - thumbnail seem to be best for such task, only one case is to create dynamic script where total length for movie can be used to create interval parameter for thumbnail...
https://ffmpeg.org/ffmpeg-filters.html#thumbnail

Do you now what command line should I use to do what I am looking for?
Thumbnail command seems to generate snapshots from the video not video splits to make a preview.

[poisondeathray]

Now, I am stuck with this. I created this script file (.avs)

AVISource("D:\My Files\05 Videos\Videotomakeapreview.mp4")
SelectRangeEvery(clip, 3000, 120, 0)

and when I try to run the script in virtualdub, it shows me this message

Error during script execution at line 1, column 10:Variable 'AVISource' not found

Am I on the right track, or I missed something?

You don't use file=>run script in vdub

You open the .avs as a video file; file => open video file

[pandy]

Do you now what command line should I use to do what I am looking for?
Thumbnail command seems to generate snapshots from the video not video splits to make a preview.

This one works for me... feel free to modify (i use only key frames)

@ffmpeg -y -hide_banner -loglevel 24 -color_range 2 -skip_frame nokey -i %1 -an -c:v libvpx-vp9 -b:v 64K -speed 0 -tile-columns 0 -frame-parallel 0 -auto-alt-ref 1 -lag-in-frames 25 -g 9999 -aq-mode 0 -vf "scale=256:-2:sws_flags=bicubic:sws_dither=none:in_range=1:out_range=1,format=pix_fmts=yuv420p,thumbnail=5,setpts=N/(15*TB)" -dash 0 "%~n1_.webm"