AC3 is Dolby's digital format. It can be 2 or more channels, up to 5.1 which is left front and rear, right front and rear, center front and subwoofer.
I suspect plenty of lobbying of the companies in the standards committee and tossing about of cash by Dolby to make AC3 audio a required component of NTSC DVD video. ;P DTS Audio is another format that can be used, but few DVDs have it. Most DVD's I've seen have one 5.1 AC3 track and one or two 2 channel AC3 tracks. Older movies and TV shows generally have only a single 2 channel track, with some having a second 2 channel track for commentary or another language if the original ever was shown/broadcast with it. Every audio track takes space away from the video. Since a standards compliant NTSC DVD is 'stuck' with AC3, hardly anyone uses the more space efficient MPEG1. --- On Sat, 1/3/09, [email protected] <[email protected]> wrote: > From: [email protected] <[email protected]> > Subject: Re: [AP] Re-using clips from DVDs > To: [email protected] > Date: Saturday, January 3, 2009, 6:21 PM > Dolby Digital is also an option for DVD in NTSC land. > > joe salerno > > > Gregg Eshelman wrote: > > > > > > If it's a commercially produced DVD you need a > clip from, it's probably > > encrypted. You'll need a utility to > "rip" the DVD files to your hard drive. > > > > There are plenty of free programs to do that. > > > > Demuxing is de-multiplexing. It separates the video, > audio, subtitle and > > other data streams so you can import them individually > into editing > > software. > > > > For your project all you'll need are the video and > audio. The video will > > be MPEG2 while the audio will most likely be AC3 > format, which is > > required for NTSC DVD. > > > > Other possible audio formats for DVD are MPEG1 or > uncompressed PCM. PAL > > DVDs can use any or all of the audio formats so you > may find some > > without AC3 audio. ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Adobe-Premiere/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Adobe-Premiere/join (Yahoo! ID required) <*> To change settings via email: mailto:[email protected] mailto:[email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
