I guess I should cap this discussion by thanking everyone who has contributed here. Even though I frequent other forums I can always count on a lively discussion on this one. BTW, try getting help for Kdenlive on the web. When I asked Kdenlive questions on the KDE forum it was not unusual to wait four days for single reply! This forum is a great resource.
After considerable experimentation I decided to I will use bwdif for deinterlacing and the nnedi filter for 11 minutes of problematic video. Here is my current configuration:
FFmpeg -y -hide_banner -loglevel warning -ss hh:mm:ss -i inputfile -t hh:mm:ss -vf "'NNedi=nnedi3_weights.bin':deint=all:field=a:qual=slow, '_denoizer_', scale=hd720:flags=spline, colormatrix=bt601:bt709, eq=saturation=1.3:contrast=1.2" -c:v libx264 -preset veryslow -crf 18 outputfile
Note: I haven’t decided which denoiser filter to use yet.
Hope this helps someone.
Addendum:
I tried formatting a 32 GB Sandisk SD card so it would work on an HDTV, Blu-ray player or Android TV box. These devices are requiring FAT32 format. However, there are several varieties of FAT32 including vFAT and exFAT. As it turns out, only exFAT supports files more than 4 GB in size. So, I formatted the SD card with exFAT and copied a video file larger than 4 GB on it. Neither the TV nor the rather new Samsung Blu-ray player would recognize the exFAT formatted SD card!
So, I have given up. The current technology does not support what we are trying to do, at least not easily. And few care about the obstacles except for some of us technical types. Therefore, since the Linux world never developed a viable Blu-ray authoring application I will produce a few family videos using Linux DVD authoring software. I will backup/archive the ISO files of each DVD and, along with the raw captured family video I have and stash it in the safe deposit box. Someday, maybe, some family member may want to do something with this old video. They will just have to figure out how.
Blessings,
-=Ken=-