PC based standards conversion.

[ukcol]

Split from this thread https://www.vintage-radio.net/forum/...ead.php?t=8919

Originally Posted by ukcol

Displays of system converters including Kat Manton's PC base experimental system. (Is this a world first?)..............

I have realised that this question is not well put. I was not asking if this is the first PC based 625/405 converter, which I am sure it is, but if it is the first PC based line standards converter of any sort?

[ppppenguin]

Originally Posted by ukcol

I have realised that this question is not well put. I was not asking if this is the first PC based 625/405 converter, which I am sure it is, but if it is the first PC based line standards converter of any sort?

Standards conversion is implicitly happening whenever you play a DVD on a PC. Often both the line number and the frame rate are converted. The latter is often not done well leading to motion artefacts such as judder or smear.

[Dave Moll]

Originally Posted by ukcol

... if it is the first PC based line standards converter of any sort?

Would you count Gary Millard's AVItoWAV NBTV converter? This takes an AVI file (not as far as I know a live video signal) and creates an output that can drive a 30-line or 32-line TeleVisor.

[ppppenguin]

Originally Posted by Dave Moll

Would you count Gary Millard's AVItoWAV NBTV converter? This takes an AVI file (not as far as I know a live video signal) and creates an output that can drive a 30-line or 32-line TeleVisor.

It's no problem for a PC to produce 30 line pictures. Since 30 line video is at audio frequencies it's done via the sound card.

[Kat Manton]

Hi,

Originally Posted by ppppenguin

Standards conversion is implicitly happening whenever you play a DVD on a PC. Often both the line number and the frame rate are converted. The latter is often not done well leading to motion artefacts such as judder or smear.

Indeed, that's basically what I've exploited - all the software already exists to play DVDs, watch and record live TV etc on 525/NTSC, 625/PAL, high-definition widescreen sets, progessive-scan PC monitors running 800x600, 1024x768 etc at anything from 50Hz to over 100Hz frame-rate. You can do this easily enough with Windows, Mac OS and Linux.

What I've done (which is a "first" as far as I'm aware) is to take advantage of the configurability and flexibility of the X Window System on Linux to configure the monitor output to produce near correct 405-line video timings - the rest of the software just worked without any modification, it's still doing exactly what it was designed to do

Regards, Kat