lurch Posted March 25, 2006 Posted March 25, 2006 Just used DVDdecrypter to spool a DVD recorded via my under-TV DVD recorder (and before that from VCR to UTV DVD HDD...!). I then used ImgBurn to copy the ISO to a second (blank) DVD (long story...) and noticed the following During the re-burn, both of the on-screen dialogs (the one that shows source ISO size and the one that shows incrementing target size (ie, '0kb and counting...') are showing a source duration that is approx double the real source file duration In other words, a source that is approx 3 hours long (actually about 2:55) is showing duration as 355:23:45 (MM:SS:FF) in the source file dialog and 339:53:19 (MM:SS:FF) as target size [see attachment for verification/further details] Apart from the other question that springs to mind ('Why aren't these durations the same?'), the overarching question is 'Why the apparent doubling???' Thanks in advance Lurch ImgBurn_Duration_Error.doc
LIGHTNING UK! Posted March 25, 2006 Posted March 25, 2006 It's not 'movie' time, its time (probably in old CD based terms) of the disc size. i.e. 74 mins = 640 mb 80 mins = 700 mb An easy mistake to make, don't worry.
Movie Junkie Posted March 25, 2006 Posted March 25, 2006 It's not 'movie' time, its time (probably in old CD based terms) of the disc size. i.e. 74 mins = 640 mb 80 mins = 700 mb An easy mistake to make, don't worry. I've always wondered about that. LUK, if the MM stands for minutes and the SS stands for seconds what does the FF stand for? Heck, I'm not even sure the MM and SS stand for minutes and seconds, I'm just guessing.
lurch Posted March 26, 2006 Author Posted March 26, 2006 It's not 'movie' time, its time (probably in old CD based terms) of the disc size. i.e. 74 mins = 640 mb 80 mins = 700 mb An easy mistake to make, don't worry. I've always wondered about that. LUK, if the MM stands for minutes and the SS stands for seconds what does the FF stand for? Heck, I'm not even sure the MM and SS stand for minutes and seconds, I'm just guessing. LUK's answer: FF = frames ================== 1] Going back to original question, I still don't understand why the source (ISO) shows 355 mins (3106 MB using yr idea/maths) and the target/result on DVD is shown as 340 mins (ish), ie 2966 MB using your maths (NB: I have used the higher factor of your two (74=640/80=700) examples, as they don't actually produce the same answer....). If anything, I would have thought DVD file system would use more space than HDD (NTFS, in case u were wondering) 2] Waddya mean 'probably in old CD-based terms' - aren't you sure? If not, why does your prog display it? 3] I have difficulty believing FF stands for Frames - are you seriously saying there are more than 45 (see my first quoted MM:SS:FF time) frames per second? This is nearly double the frame rate Hollywood uses for film! I suspect it stands for Fractions of a second (ie, hundredths of same), but obviously I could be wrong NB: This might come across as confrontational (i've just come home from the pub...) but no offence is meant, just 'lively discussion' Rgds Lurch
LIGHTNING UK! Posted March 26, 2006 Posted March 26, 2006 1. If the 640/700mb values don't add up, maybe it's 650/700. It's been a long time since I really took any notice of that code. You've not finished burning the image in that screenshot so 340 / 355 shows bugger all! If you'd have taken the screenshot earlier it could be 230 / 355! 2. I'm explaining it to you and trying to put it in laymans terms. If you actually knew what you were talking about you wouldn't have reported this as a bug in the first place. 3. Like I said, this is NOTHING to do with movie FPS. There are 75 frames per second when speaking about an image in MSF terms. So yes, you are wrong. Here, as I can tell you won't be happy until you're right, I'll set you straight with some extracts from the MMC specs. Hopefully you won't try and tell me they're wrong too! 3.2.17 Frame A CD frame is a physical CD sector. The F field unit of a MSF CD address is the frame field. For the Host, this is the smallest addressable unit on CD media. 3.2.25 Minute, Second, Frame address (MSF) The physical address expressed as a sector count relative to either the beginning of the medium (absolute) or to the beginning of the current track (relative). As defined by the CD standards, each F field unit is one sector; each S field unit is 75 F field units; each M field unit is 60 S field units. Valid contents of F fields are binary values from 0 through 74. Valid contents of S fields are binary values from 0 through 59. Valid contents of M fields are binary values from 0 through 79. Like I said before, this MSF is a left over from CD days. People do still burn CDs so I've left that 'Time' value there. I know the second I remove it someone, somewhere will request that I put it back.
lurch Posted March 30, 2006 Author Posted March 30, 2006 Ouch, ouch and ouch again..... Consider the gnat duly swatted Apologies - also for delayed reply (been working away - though I suspect you haven't been drumming your fingers...)
dbminter Posted March 31, 2006 Posted March 31, 2006 We're back on this subject again! Don't feel too bad. I remember finally learning the answer to this stupid notation myself from a post on the old forum. Still, a time duration error beats a time DILATION error, by any means.
Wombler Posted April 1, 2006 Posted April 1, 2006 so FF isnt "For Fooksake" then ? Heh heh heh..... Nice one! Nemesis
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