AC-3 also known as Dolby Digital is a lossy audio format used to store up to 6 channels of audio in a single stream. The max bitrate varies depending on where it came from. For regular DVDs the max bitrate is 448kbps. So if you re-encode it as something else you'll introduce more artifacts than is already present in the AC3. Unless you have issues with the format itself, the clearest sound will be to leave it alone. AC3 is typically not stored in a standalone file but embedded as a track in some other file format like MPEG or Quicktime. There is a bit more info to be found here:
http://www.hometheaterfocus.com/surround/dolby-digital-true-hd.aspx CB erik burggraaf wrote: > Right. After some poking around I managed to find the drawer. Thanks for > the help, but I have no idea how I got there since pushing the streams button > didn't seem to do anything. It was just there one time when I cruzed around > the window. Very strange. > > I got a dvd extracted to ac3 2 channel. Does any one know if this is a > lossless audio stream? I know that sometimes dvd audio is compressed on the > disc, and so some times it really doesn't make a lot of sense to have a > lossless copy, but I don't want to go re-encoding the output file if it has > lossie compression of it's own. In that case I'll just go back to dvd audio > extracter on windows for the time being. > > Best, > > erik burggraaf > A+ certified technician and user support consultant. > Phone: 888-255-5194 > Email: e...@erik-burggraaf.com > > On 2009-11-25, at 6:07 PM, Darcy Burnard wrote: > > >> When you press the streams button, a drawer should appear. Interact with >> that drawer and you should see checkboxes for all video and audio streams in >> that particular title. >> Lately however I've found that mac the ripper has had trouble with the >> demuxing process on some of my discs. When this happens, I have it extract >> the title I want without demuxing. I then open the resulting .vob file with >> mpeg stream clip, which can export the audio. I don't have the URL for mpeg >> stream clip, but a quick google search should find it. >> Darcy >> >> On 2009-11-25, at 11:11 AM, erik burggraaf wrote: >> >> >>> Hum. >>> >>> I've got mack the ripper and I'm trying to use the isnstructions below. >>> When I choose my title and check the demux box, then hit the stream button, >>> nothing happens. I thought a dialog box or soemthing would pop up so I >>> could choose my stream. Am I missing something? >>> >>> Thanks, >>> >>> erik burggraaf >>> A+ certified technician and user support consultant. >>> Phone: 888-255-5194 >>> Email: e...@erik-burggraaf.com >>> >>> On 2009-09-25, at 4:40 PM, Darcy Burnard wrote: >>> >>> >>>> Hi Eric. There is an option in Mac the Ripper to rip just the audio. >>>> However you can only do it one title at a time. When you select the >>>> title you want, the window then has a demux button. Pressing that >>>> will give you a list of all the video and audio streams in that >>>> particular title. If you just select the audio stream, that's all you >>>> get. >>>> The audio is in ac3 format, so you'll need another program to do >>>> something meaningful with that. I've used quicktime pro with perian >>>> installed, but I'm sure there are other solutions. >>>> Darcy >>>> On 2009-09-25, at 10:36 AM, erik burggraaf wrote: >>>> >>>> >>>>> Hi guys for some reason I thought that mac the ripper would extract >>>>> just the audio from a dvd, but not from the description I'm reading. >>>>> This seems to be a full dvd extracter. Useful, but not what I'm >>>>> looking for just at the moment. Did I get this program confused with >>>>> another one? >>>>> >>>>> Thanks, >>>>> >>>>> erik burggraaf >>>>> A+ sertified technician and user support consultant. >>>>> Phone: 888-255-5194 >>>>> Email: e...@erik-burggraaf.com >>>>> >>>>> >>>>> >>>> --~--~---------~--~----~------------~-------~--~----~ >>>> You received this message because you are subscribed to the Google Groups >>>> "MacVisionaries" group. >>>> To post to this group, send email to macvisionaries@googlegroups.com >>>> To unsubscribe from this group, send email to >>>> macvisionaries+unsubscr...@googlegroups.com >>>> For more options, visit this group at >>>> http://groups.google.com/group/macvisionaries?hl=en >>>> -~----------~----~----~----~------~----~------~--~--- >>>> >>>> >>> -- >>> >>> You received this message because you are subscribed to the Google Groups >>> "MacVisionaries" group. >>> To post to this group, send email to macvisionar...@googlegroups.com. >>> To unsubscribe from this group, send email to >>> macvisionaries+unsubscr...@googlegroups.com. >>> For more options, visit this group at >>> http://groups.google.com/group/macvisionaries?hl=en. >>> >>> >>> >>> >> -- >> >> You received this message because you are subscribed to the Google Groups >> "MacVisionaries" group. >> To post to this group, send email to macvisionar...@googlegroups.com. >> To unsubscribe from this group, send email to >> macvisionaries+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/macvisionaries?hl=en. >> >> >> > > -- > > You received this message because you are subscribed to the Google Groups > "MacVisionaries" group. > To post to this group, send email to macvisionar...@googlegroups.com. > To unsubscribe from this group, send email to > macvisionaries+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/macvisionaries?hl=en. > > -- You received this message because you are subscribed to the Google Groups "MacVisionaries" group. 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