Feeds

Getting Started with Avisynth

Turn your PC into a video powerhouse

  • alert
  • submit to reddit

5 things you didn’t know about cloud backup

Conventional wisdom tells us that to be truly useful, computers need to be tamed to work the way we work, not the way they want to do things. Following this philosophy, movie-editing software like Apple's Final Cut Pro and Adobe's Premier emulate reels of celluloid that you can wind through to find your edit points. Unfortunately, this emulation eats up computer resources. Dispense with it, and there's a great way you can do movie editing without having to lash out on a quad-core machine with multi-gigabytes of Ram.

The secret is a software application called Avisynth. I mainly use it for cleaning up films recorded off the telly. But Avisynth is perfect for taking control of your own home-video footage, perhaps turning it into DVDs for the family time-capsule. Or whatever.

Of course, professional editing software offers non-linear editing (NLE) - the ability to access frames at random and do virtual cuts without modifying the original clip - and a feast of instantly deliverable transitions - dissolves, wipes, and so forth. Not stuff you'd expect to do on an 800MHz single-core Celeron system. But guess what? With Avisynth, yes you can.

Because it's not NLE and transitions that eat up computer resources, it's that pretty interface emulating a pre-war Moviola reel-to-reel editor. Take that away, and what you have got is something that looks like this:

video = MPEG2Source("Clip1.d2v", cpu=0)
audio = NicMPG123Source("Clip1 DELAY -746ms.mp2")
AudioDub(video, audio).DelayAudio(-0.746)
Trim(29, 162052)
Dissolve(Trim(0, 28648) , Trim(35426, 162023), 5)
Trim(0, 61566) ++ Trim(68844, 155241)
Dissolve(Trim(0, 98264) , Trim(105041, 147964), 50)
Trim(0, 141032)

Yes, it's a script. The bad news is the only thing in the world that can understand it is Avisynth. But now for the good news.

1. Avisynth is free software.

2. Avisynth runs on 98 per cent of the the world's computers. That's the upside spin - "runs only on Windows" would be the pessimist's version.

3. That eight-line script is all you need to (in this case) turn a TV recording of a movie, with junk at the beginning and end, and three ad breaks in between, into a continuous presentation that wouldn't disgrace a small cinema. By "continuous presentation" I don't just mean ad removal, I mean a proper rebuild of the movie that totally conceals the fact that ads were ever there in the first place.

There's more good news. With a few extra lines of script we can seamlessly eliminate the tendency some TV channels have of ruining the finale by sliding in visuals announcing what's coming next and/or talking over the closing music. We can even blot out - and in many cases virtually make invisible - those eye-grabbing logos that channels like More 4 and ITV 2 stamp on every frame of the movie footage they transmit.

5 things you didn’t know about cloud backup

More from The Register

next story
The Return of BSOD: Does ANYONE trust Microsoft patches?
Sysadmins, you're either fighting fires or seen as incompetents now
Munich considers dumping Linux for ... GULP ... Windows!
Give a penguinista a hug, the Outlook's not good for open source's poster child
Intel's Raspberry Pi rival Galileo can now run Windows
Behold the Internet of Things. Wintel Things
Linux Foundation says many Linux admins and engineers are certifiable
Floats exam program to help IT employers lock up talent
Microsoft cries UNINSTALL in the wake of Blue Screens of Death™
Cache crash causes contained choloric calamity
Eat up Martha! Microsoft slings handwriting recog into OneNote on Android
Freehand input on non-Windows kit for the first time
Linux kernel devs made to finger their dongles before contributing code
Two-factor auth enabled for Kernel.org repositories
prev story

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
7 Elements of Radically Simple OS Migration
Avoid the typical headaches of OS migration during your next project by learning about 7 elements of radically simple OS migration.
BYOD's dark side: Data protection
An endpoint data protection solution that adds value to the user and the organization so it can protect itself from data loss as well as leverage corporate data.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?