Pushing as Many Pixels as Possible to a CRT: Interlaced 4K

https://fed.brid.gy/r/https://hackaday.com/2026/05/02/pushing-as-many-pixels-as-possible-to-a-crt-interlaced-4k/

digitized eight old #VHS tapes, first two with `ffmpeg -vf bwdif` (deinterlacing filter, with default options).

turns out this did the wrong thing (motion was juddery, something like frame order 2 1 4 3 6 5 instead of 1 2 3 4 5 6), but a simple frame swapping program I wrote to fix it made some parts perfect but other parts even worse (swappting wrong pairs like ... 4 1 6 3 8 5 ...), so I think #ffmpeg #bwdif does some autodetection/switching during the video encoding.

can not redigitize the first tape because VCR machine chewed it.... workaround until I figure out a proper solution: drop half the frames to give a 25fps output video instead of 50fps.

second tape I redigitised, like the other six tapes, using `-vf bwdif=parity=bff` which seems to be the correct #interlacing #FieldOrder for my capture hardware and source (EasyCAP USB device with JVC #VCR , norm #PAL , 720x576i50), at least I haven't spotted juddery motion there.

#archiving #analog #digital

I finally got around to making a Celtic knotwork / interlacing fabric design to go with my Celtic key pattern and spiral designs! Seen here with one of my 42mm d20 chonks.

#CelticArt #CelticDesign #CelticKnot #Knotwork #Interlacing #Textile #FabricDesign