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It depends on your captured video.
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Can i make the post processing methods also in VirtualDub or should i move on to Avisynth (never used it before)?
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VirtualDub has a limited set of filters, some of them are excellent. AviSynth offers a much larger choice.
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There is a little head-switching noise at the bottom but i am not sure how to use masking properly in Cropping menu without messing up the resolution.
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Cropping is different than masking. To mask the head switching noise on the bottom you need to remove the bad lines and replace them with black lines. There are more sophisticated techniques to recover the few lines in the "bad" portion of the frame that are good, but that's another story. AviSynth needed.
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I can not decide that deinterlacing is okay or not in post processing or it is forbidden just in capturing phase.
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The video must be captured in its original form, interlaced or "progressive" (with the word progressive here I mean that the fields are coming from the same moment in time).
In order to assess the nature of the video (interlaced, telecined, whatever else), it must be analyzed manually.
If the video is interlaced, it is a question of your preference and your goals to decide or not about deinterlacing it, in post-processing.
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Are there any written or video recorded guide about post processing as well?
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Any video is "unique", and there is not a general guide. However, if your capture has not a major problem, a standard deinterlace / denoise / sharpening filtering can be applied. Post a significative sample of your video.