On 5/31/05, Steven M. Schultz <[EMAIL PROTECTED]> wrote: > > On Tue, 31 May 2005, Soren Tirfing wrote: > > > This is a request for an RTFM pointer, if I'm lucky... > > The answer is less of a FM pointer than some (hopefully helpful) > hints & tips > > > I have a bunch of Hi8 tapes that I would like to capture before they > > deteriorate too badly. > > Excellent idea. Hi8 tapes hold up better with age than VHS tapes > but it's still a good thing to get the tapes converted as soon as > possible (for one thing while decks/camcorders are still available > that can read 8mm tapes). > > What is the goal? To archive the tapes/preserve as closely as > possible (by placing the the data on digital tape - miniDV perhaps)? > Or is the goal to edit out and toss the parts that today appear > uninteresting/boring and then put "just the good parts" on DVD? Or > a combination of the two - place the entire tape "as is" on DVD > with chapter markers at the interesting scenes? > > How were you planning on doing the captures? DV - with a > analong->DV > converter such as the Canopus products (ADVC100, ADVC300, ...). Or > using a Digital8 camcorder (most of them can play analog/Hi8 tapes and > emit DV data on their IEEE1394a (iLink) port)? Or something higher > end such as the AJA Io-LA (http://www.aja.com/products_Io.html#iola)? > > Or ??? > > > Capturing a tape to one giant file, or a few giant > > files, is easy. It is pain to edit the stuff based on that however. > > Not a pain at all if you've got the right tools :-) Just scrub thru > the timeline, cut, scrub, cut, (optionally) delete. > > Now for analog captures I have yet to encounter a tape that did not > require some color correction - either due to tape deterioration or > less than ideal lighting conditions (bad/incorrect whitebalance). > Were you planning on doing any colorcorrection/restoration to the > data? > > Besides you're quite likely to end up doing something like that anyhow > if you're going to DVD. Depending what tools you use to create the > DVD you may not be able append multiple files together - so if you > were planning on encoding each 'scene' separately you may be in for a > big surprise. You'll likely end up in a situation where you'll want > a single monolithic encoded file to place the chapter points in. > > > Is there an easy way to chop up the files, using readily available tools, > > based on automatic scene detection? > > Some programs (such as Kino) do the 'scene detection' by means of the > timecode on the tape - each time you start/stop recording with a > miniDV camcorder the timecode info 'breaks'. > > Offhand I don't know of a 'scene detection' program that works by > comparing frames. Maybe someone's written a program that can do that > and they'll chime in. > > Cheers, > Steven Schultz
I wrote one based on the DC coefficients of macroblocks in an Mpeg2 elementary stream. It uses a really hacked-up version of mpeg2dec. I never finished it into a standalone project. It worked quite well, better than using the full decoded frame, and was very fast, about 10 times faster than real-time on modest hardware. There is some literature describing this idea, but I don't have it with me right now. My request: I would like to see a compressed-domain scene detection algorithm for DV files. This could be built into Kino as an option instead of the timecode matching. Then folks like Soren could capture with a Digital8 deck and Kino. Regards, Mark [EMAIL PROTECTED] -- You think that it is a secret, but it never has been one. - fortune cookie ------------------------------------------------------- This SF.Net email is sponsored by Yahoo. Introducing Yahoo! Search Developer Network - Create apps using Yahoo! Search APIs Find out how you can build Yahoo! directly into your own Applications - visit http://developer.yahoo.net/?fr=offad-ysdn-ostg-q22005 _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
