Order of operations: Segmenting, deinterlacing, denoise, etc.

[crbd98]

Hello All,

After many hours, trial-and-error, and a lot of help from this group, I managed to capture most of my personal VHS, VHS-C, and Mini DV tapes as AVI files using a lossless encoder. Each file is 1-2 hours long and contains multiple scenes. Ultimately, I would like to separate each scene in an individual file and clean up the content. The result would be played on a computer.

Thence my question: In which order should I perform the following operations?
- Segment the content into scenes
- Deinterlace
- Denoise
- Color/brightness/chroma correction

Thanks
crbd98

[Selur]

my 2 cents:
a. avi is a container not a format so that information doesn't really say much
b. in general I would: first deinterlace, then adjust the color, then denoise and in the last step split the content
But since some filters might require to be applied before the deinterlacing, then those have to be moved before the deinterlacing.
Depending on the amount of denoising, the denoising itself might change the color etc. so if your colors are changed by the other filters, you might want to move the color correction to the end.
Also if your files contain content from different source or scenes which require different filtering, it might make the processing easier if you split them beforehand.
+ if your colors are so messed up that other filters won't work properly without fixing them, color corrections need to be done first.
-> it all depends,...

Cu Selur

[crbd98]

Hello Cu Selur,

Thank you for your input.

Regarding a. You're correct. Stating that it is AVI does not help much. Here is more detail. The content is NTSC, 29.97. It is compressed as YUY2, 720x480. I use lossless video compression "UtVideo YUV422 BT.601 VCM".

Regarding b. You got it right. Each video files contains numerous scenes (between 25 and 35) and their quality varies dramatically depending on the light conditions. For example: The outdoor scenes on a sunny day look very good but the ones indoor or under poor light are grainy and dark. Therefore, I don't think I can apply the same level of correction across the whole file. I am afraid I will need to correct in a scene-by-scene basis and therefore split each scene before hand before deinterlacing, color correction, and denoise (Yeah, as you said it depends )

Thanks
crbd98

[manono]

I am afraid I will need to correct in a scene-by-scene basis and therefore split each scene before hand...

You don't have to split before filtering different sections differently. In fact, that sounds to me like a whole lot of wasted time and effort.

You can filter different sections differently using ReplaceFramesSimple. It's part of RemapFrames. One example from a movie I'm working on now:

A=Last
B=A.Levels(0,0.70,255,0,255,Coring=False).Tweak(Br ight=9,Cont=1.0,Coring=False)
ReplaceFramesSimple(A,B,Mappings="[33990 34066] [34654 34657] [38809 40334] ")

Only the frame ranges shown are filtered using that combination of Levels and Tweak.

[Barrythecrab]

A flow chart for filter order would be spectacular.