12:0412:04, 22 April 2015diffhist+111
LaserDisc
→LaserDisc sizes: If we're going to do this properly and make the size differences between LDs and Vinyls properly clear, then we should at least use the correct primary units and a sensible, uniform level of precision in the conversions.
14:3514:35, 20 April 2015diffhist+590
VHS
→Tape lengths: meant to add this additional note earlier. I've found a lot of weird running-time tapes in otherwise perfectly normal retail packaging on my hunt for metre/foot lengths...
14:2714:27, 20 April 2015diffhist−31
VHS
→Tape lengths: de-tautologising, and adjusting for -actual- playing time using the correct conversion factors (not basing off nominal minutes length or using the previously stated, incorrect factors)
13:1313:13, 20 April 2015diffhist+160
VHS
→Tape lengths: been reminded of the existence of these lengths by some labels on a VHS sticker strip I just found (still having to identify some old tapes for transferring for professional reasons...). Less common but definitely not unknown on the mkt
12:2112:21, 20 April 2015diffhist+1,328
VHS
→Tape lengths: "equival"? Never heard of that abbrevia. in English before. Use "equiv" or just "equivalent". Also, what's the "(unknown)" bit all about? have now checked actual lengths of DF tapes etc inc averaging -- actual TIMES to be tidied up.
11:2311:23, 20 April 2015diffhist−2
D-VHS
→Tape length and speeds: Wholly ludicrous bit of false precision. No-one is going to actually specify their tape length down to the millimetre (approx 1 vid frame!), even if that's what the "feet" length is *exactly* equivalent to...
11:2011:20, 20 April 2015diffhist+2
VHS
→Tape lengths: Sorry, no matter how you slice it, 3.335 / 2.229 doesn't make 1.41 ... nor does the inverse make 0.71. No idea how you arrived at those roundings (2dp still = 1.43 / 0.70). The relationship is NOT (inverse) root-2!
11:1811:18, 20 April 2015diffhist+30
VHS
→Recording capacity: The way it was explained to me was SP=tracks fully separate, LP=tracks touching but no overlap (=10-20% loss due to tracking issues), EP=tracks partially overlap (=BIG quality loss). The *length*/raw BW of each track is unchanged!
11:1411:14, 20 April 2015diffhist+2
VHS
→Tape loading technique: The drum makes one full turn for every complete frame (2 fields) of video information. PAL framerate is 25fps (x60 =1500rpm), but NTSC is 29.97 NOT 30.0 (=1798.2 not 1800). HowStuffWorks is only a *basic* kids' reference work!
11:0811:08, 20 April 2015diffhist+166
VHS
→Cassette and tape design: There seems a per-minute significance to the actual tape speed, which makes calculating the total metre length quite easy once explained. Also bit odd that VHS is officially spec'd in inches but only metric is used here...
09:0809:08, 20 April 2015diffhist−374
VHS
→Tape lengths: Never heard of PAL VHS >300 mins, neither has Google no matter how inventive my search terms - only finds VHS *DECKS* with 360/420/480 in their name - and this page. If you can prove they're not imaginary, THEN revert this :-)
14:2514:25, 14 April 2015diffhist0
InterCity 225
...why specify "sigfig=2" when the first number has three significant figures and you're converting to a system where the units are notionally smaller, not larger?
14:0514:05, 14 April 2015diffhist0
TGV
→On LGVs: Interesting. All the speeds below 100mph (even if over 100km/h) autoconvert to single-place accuracy, so can be left. But this still needs alteration as it's fairly well known 250k = 155mph, not 160... (!)
14:0314:03, 14 April 2015diffhist−15
TGV
→Accidents: hmm, interesting, let's just pop out of this for a sec and see what a hash it's made (or not?) of all those other speeds.
14:0214:02, 14 April 2015diffhist+4
TGV
→Future TGVs: Just as an illustration of how dumb this all is, according to the converter both the 350km/h and 360km/h trains run at the same speed in mph, rather than being 7mph different (after integer-place rounding)...