The Decomb Plugin for AviSynth (developed by Donald Graft) is a foundational tool used in video post-production to remove combing artifacts, deinterlace footage, and perform Inverse Telecine (IVTC). It is highly prized for restoring 24fps progressive frames from 29.97fps telecined NTSC video or handling difficult PAL mixed-content streams.
The official manual outline outlines a precise step-by-step cookbook procedure to install and use Decomb effectively. Step 1: Download and Install Decomb
To use the plugin, you must integrate it into an AviSynth scripting workflow.
Download the Decomb.dll file from an authoritative repository like the AviSynth Wiki Decomb Page.
Paste the Decomb.dll file directly into your AviSynth plugins directory (usually located at C:\Program Files\AviSynth\plugins</code>). If it is in this folder, AviSynth will auto-load it.
If you store the DLL elsewhere, you must manually load it at the very top of your .avs script file using its absolute path: LoadPlugin(“C:\YourFolder\Decomb.dll”) Use code with caution. Step 2: Set the Field Order (Telecide Step 1)
Decomb’s primary field-matching function is called Telecide(). To work properly, it must know whether your video is Top Field First (TFF) or Bottom Field First (BFF). Open your source video stream in your script: MPEG2Source(“C:\path_to_video\video.d2v”) Use code with caution.
Add Telecide(guide=0, post=0, show=true) to your script and open it in a media player or video editor like VirtualDub.
Analyze a sequence with heavy movement. Look at the text overlay provided by show=true.
If the movement matches smoothly, your field order is correct. If the motion jerks backward and forward, change the order parameter (e.g., Telecide(order=1) for TFF, order=0 for BFF). Once determined, lock it in your script. Step 3: Enable Pattern Guidance (Telecide Step 2)
If your source video comes from a standard film-to-video transfer (a clean 3:2 pulldown), enabling pattern guidance helps the plugin lock onto the frame cycles more accurately. ErMaC’s Guide to All Things Video - Part 5
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