Hi all, just found this discussion on sursoud mailing list. It may shed some additional light, so I forward it (albeit somewhat shortened)
-- Hermann -------- Original Message -------- Subject: Re: Go DD Lossless (MLP)! Blu Ray! Date: Wed, 1 Feb 2006 17:34:46 -0800 From: Garry Margolis <[EMAIL PROTECTED]> To: Surround Sound discussion group <[EMAIL PROTECTED]> >> Geoffrey: >>> As soon as a removable optical drive (lets call it an HDVD-R) with enough >>> storage for an hour >>> of HDV exists, I shall buy it just for the convenience of not having to >>> play the tapes. Mark Stahlman <mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED] wrote: >> Excellent analysis!! >> >> Sony has been very successful selling HDV videocameras and *more* HD video >> content is being >> recorded in this tape-based format than all the other HD formats combined. (...) >> Obviously, tape is not the right place to store this -- whether simply >> archiving or playing >> back edited videos. >> Hard disk is also not the solution. The one hour video I recently took takes >> up 46 GB when >> imported into iMovie HD, for example. >> >> As soon as a simple, cheap solution exists in plastic disks, they will FLY >> off the shelves. >> >> That solution will be recordable HD-DVDs on Microsoft machines. >> Game over. >> >> Mark Stahlman Stefan Schreiber: > "46GByte": I don't get this. One hour HD-video is certainly less. > Proof: HDV uses the bitrate of DV videotapes, which is 25MBit/s. > One our HDV needs 25 MBit/s * 3600s / 8 = 11.25GByte. > > I think there might be some "Pro" formats with 50MBit/s, but even then it's > less than half of > your figure... (...) Garry Margolis <[EMAIL PROTECTED]>: Video editing software may transcode the MPEG-2 original HDV stream, which has only one fully-encoded frame per half-second -- all other frames are regenerated on the fly from intermediates which include only the changes subsequent to the previous frame. The Apple Intermediate Codec, for example, regenerates every frame from the MPEG stream, so its output requires considerably more disk space than the original stream. Other codecs may have intermediate frames between full frames and, thus, use less disk space than the Apple. Using the transcoded stream for editing considerably reduces the load on the processor, which need not regenerate the intermediate frames on the fly. Garry _______________________________________________ Sursound mailing list [EMAIL PROTECTED] https://mail.music.vt.edu/mailman/listinfo/sursound _______________________________________________ Cinelerra mailing list [email protected] https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
