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Posted by Ken Maltby on 10/05/77 11:38
"Bill Lee" <billTakeThisOutlee+usenet@mac.com> wrote in message
news:billTakeThisOutlee+usenet-177B79.14464830012006@eth00.pnews.internode.on.net...
> In article <1138581319.764400.174900@f14g2000cwb.googlegroups.com>,
> "Paul Turner" <turnerpaul@gmail.com> wrote:
>
>> ok, so I've spent ages in Premiere and I'm lef with 8 movies for the
>> dvd I'm making. the thing is, after I've exported them (at avi/dv
>> codec settings) all 8 files come to 22gb!
>
> 22GB is about one and a half hours of DV video, using the rough rule of
> thumb of 14GB per hour for DV. If you know the exact sum of the minutes
> of video you can feed it into the following calculator:
> <http://www.videohelp.com/calc.htm>
>
>> What's the easiest way to reduce the size, without losing quality, so i
>> can fit them on a 4.7gb dvd?
>
> If you are making the video for a DVD then you'll need to transcode your
> DV Codec encoded video into MPEG-2 codec video. Transcoding will lose
> quality - the question is: "How much, and will it be noticeable?" The
> less compression you have to do, the less quality should disappear in
> the process.
>
> A good place to start is to look at the DVD Authoring package you are
> going to be using. Make sure it will support the MPEG-2 that you are
> going to feed it, as well as the type of audio you are going to feed it.
>
> If you don't have a lot of extras (menu animations, subtitles, alternate
> angles, or alternate audio tracks), then you should be able to get by
> with a 'reasonable' MPEG-2 encoder, which should give OK results for
> 6Mbits per second target rates. Encode your Audio as Dolby Digital
> instead of PCM, as this will give you an extra megabit per second to
> allocate to your video. Some encoders have Variable Bit rate encoders
> (VBR) which, although taking longer to encode than Constant Bit Rate
> (CBR), usually are more efficient in their use of your available bitrate
> (it depends also on the source material). Be aware that the instant
> peaking of bitrate on some VBR encoders may exceed the nominal limit of
> the maximum bit rate, and that depends on the transcoder (RTFM if you
> experience problems with overly high instantaneous peak bitrates).
>
> Since I work with Macintoshes, I'll not attempt to answer exactly which
> PC software transcoder to use, but at the bit rates that you are
> proposing, there should be a reasonable number that will give you the
> desired quality. If you had to fit twice as much video on your DVD it
> would be much more difficult and expensive answer to your question.
>
> Another thing to keep in mind is that more bits is not necessarily going
> to give you increased quality. Keep your combined video and audio to
> less than 9Mb/sec (8.5Mb/sec is better) to improve playback quality,
> especially on some cheaper DVD players. This would apply when making
> shorter DVDs, where you might be tempted to up the video bitrate to
> 9Mb/sec and leave the audio as PCM, which would drive the overall bit
> rate to about 10.5Mb/sec - this disk will fail on a number of DVD
> players.
>
> Bill Lee
The factors that effect MPEG encoding are the same for Mac
users as they are for PC users. Your points are certainly valid.
Most Encoders offer to limit the video peak bit rate at 8000kbps
to avoid one of the problems you site, though.
The way I read the OP, Mr. Turner has perhaps two storage
issues to address. One may be how to preserve the source
"footage" in an easily and fully editable format, for future use/
project modifications. The other is concerning his options for
the DVD he intends making.
I feel that Digital Tape provides the best long term A/V storage
option for the consumer and professional on a limited budget.
If you can send a digital format back out your Firewire port and
have your DV camcorder create an edited tape; that would be
somewhat cheaper than most DLT options. A Mini-DV tape
deck would be an excellent solution, but usually an expensive one.
Another (and I think better) solution to both long term storage
and more practical project development (without tape transport
issues); is to use an attached hard drive. A Firewire or SATA
External Drive, can be setup to hold all your project support
files as well as the source footage. A single large drive could
hold a number of projects and all associated files, and/or you
could get a few smaller drives, each with their own type of
project. With drives going for close to $0.50 a GB, this
approach is much more practical than in the past. With this
method of working there is no need to transfer your files to
storage, as they would already be on the drive that would
eventually become the storage media.
For the DVD creation you really have only two options,
one is where you create your own burned DVD to serve a
very limited distribution, or you provide whatever media and
format the professional DVD production company requires.
If you make your own you have a number of options as to
how to proceed. From not authoring the DVD and playing
your creation in a "DVD/Media" player that can play your
files as they are, to Encoding and Authoring a DVD to rival
any Hollywood produced DVD, with menus, subtitles,
alternate audio, and "Extras". You could even do away with
the DVD altogether, store your video on a NAS and serve it
over your LAN to a Networked Media Player.
Luck;
Ken
P.S. You're not any relation to "Bootstrap" are ye mate?
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