[st5150]

Hello. Can someone tell me the missing xxx numbers here:


Code:

[left]hours : minutes : seconds : xx . xxx ----- ------- ------- -- --- 60 60 60 xx xxx[/left]

Just trying to do some math with this time format but something isn't adding up. What's the proper name for this format? I couldn't wikipedia it.

 

[)v(ajin_R_]

hmm

would xx be centi-seconds and xxx be micro-seconds?

is the . a decimal or is it denoting the next unit of time?

 

[st5150]

okay, I did some more research and have some more questions....


So 04:18:63 = 4 minutes, 18 seconds, 63 frames. Naturally its 18/60 seconds, but 63 out of how many frames? I assume since I have 44.1k samples per second, its 63/44100 ?

What confuses me more is how audio editing programs use a different system. Take a look at the 1:04.364 part

 

[st5150]

Quote:

Originally Posted by )v(ajin_R_ hmm would xx be centi-seconds and xxx be micro-seconds? is the . a decimal or is it denoting the next unit of time?

It's a decimal, and after playing around with the math, it seems to denote a xx/75 fraction.
Where does the 75 come from???

 

[lan]

Quote:

Originally Posted by st5150 So 04:18:63 = 4 minutes, 18 seconds, 63 frames. What confuses me more is how audio editing programs use a different system. Take a look at the 1:04.364 part

I read 1:04.364 as 1 minutes 4 seconds and 364/1000th of a second. Audio's subdivision of time is by decimals and for video editing it's by frame. Your example above with 63 frames is odd. It's max should be what the frame rate of the video is.

 

[st5150]

Ian, cue sheets seem to use the xx/75 format,

http://en.wikipedia.org/wiki/Cue_sheet

so 31:26:60 is the same as 31:26.800 (60/75=.8)

 

[lan]

The cue sheet and audio data storage on CD is different than audio and video editing though. CDAA/redbook uses 75 frames / second.Although you could do the conversion it's a bit strange because people think of audio time in decimals. The cd drive and recorder think in those frames when it makes the audio cd.