XP mode recording. Worth it???? what about SP????

[mikej3131]

Hey i just got my new JVC DR-m100s and am starting to record shows. I noticed that when i set the recording for XP, it gives my dvd of the show i recorded a Bitrate of 10mb. When i captured the same show to my computer(via firewire, so it was a 1:1 copy of the show), the bitrate was only 7.5mb.
Well my question is, if all the shows on cable are only 7.5mb originally, then it cant get any better at 10mb, can it? and if so, then is it even worth recording in XP mode(are there other benefits other than bitrate?).

another thing im alil confused on is the FP mode this JVC has. It lets you set the amount of minutes you want(ex. 134 minutes) for a dvd recording. What im confused about is what would be the quality if i set a dvd recording at 1 hour and 30 minutes. That would be between XP and SP, now what would the quality be closer to?

IF i set the FP mode to 45 minutes, will it be better than XP quality?

[DVWannaB]

It is going to basically come down to what your eyes tell you. We can give you all the technical mumbo-jumbo about bitrates and relative quality, but the final judge of quality is your eyes.

Recorders cannot record in 45 minute modes. Some newer models can do an XP+, but you cannot record this to any disc. It has to be re-encoded in XP or lower settings to get it on disc.

I believe the bitrate that was reported in your recording is inaccurate. If your recored on ANY DVD recorder the highest bitrate it will give is around 9.8 Mbps. It is possible that your reading was rounded up. DVD players will not play anything above 9.8 Mbps.

As for the original 7.5 Mbps vs the XP and FR record modes again it will be at the judgement of your court. Just remember that at XP it will give the best reproduction of the original image. As you go down on bitrate (or FR modes) the picture becomes farther away from the original as far as quality is concerned. What usually determines my choice of recording modes is the length of the recording and whether or not I want it on 1 or 2 DVD-R or on 1 DVD+R Dual-Layer disc and what the final picture am I comfortable with. You will have to do your own tests at various settings and then decide.

[piano632]

It's not possible to get a 1:1 copy from the firewire out on the JVC (or any other model) because going thru firewire converts it to DV format. You can only get a 1:1 copy by taking the DVD out of the JVC and ripping it on a computer drive.

Assuming you did manage to make a 1:1 copy, 10mb is the MAX (peak) bitrate whereas 7.5mb would be AVERAGE bitrate.

FR mode (not FP) doesn't have a FR45 setting. FR60 is the lowest (or should I say highest) which is equivalent to XP. Whether you need XP or SP or anything in between depends on what you are recording and how much you want to fit on 1 disc. If you are recording something with a lot of fast motion (i.e. auto racing) or something with a lot of noise (graininess) than XP would be better. If you are recording something with not too much fast motion (like a sitcom) and you have a clean image (low noise) than SP should look very close to XP.

[DVWannaB]

It's not possible to get a 1:1 copy from the firewire out on the JVC (or any other model) because going thru firewire converts it to DV format. You can only get a 1:1 copy by taking the DVD out of the JVC and ripping it on a computer drive.

I dont think he is trying to record via firewire to his JVC machine. I believe he was just doing a comparison of recording from his receiver via firewire to his computer versus recording on the DVd recorder and getting a 1-for-1 copy and the matching bitrates in which to get that accomplished.

[mikej3131]

[/quote]It's not possible to get a 1:1 copy from the firewire out on the JVC (or any other model) because going thru firewire converts it to DV format. You can only get a 1:1 copy by taking the DVD out of the JVC and ripping it on a computer drive. [/quote]yea the 1:1 copy i was reffering to was my captured video from my cable box to my computer which was 7.5mb. then the jvc dvd recording in xp was 10mb for the same show. So it giving the show a higher bitrate than the show originally had, which wouldnt improve the quality, right?




What do you mean by "noise" in fast motion scenes?


would it be bad to copy a sitcom slow motion show in XP and why or why not?

[piano632]

I don't think it's ever bad to record in XP, just that it has a time limit of 1 hour per disc. If you want to record a 2-hour show, you obviously can't use XP unless you split it over 2 discs. I'm just saying that I haven't seen any great loss using SP with most sources.

Just do some test recordings with a rewritable disc and see what is acceptable to your eyes.

[RabidDog]

unfortunately you cannot simply say a 10mb recording is better than a 7.5mb one . It all depends on the quality of the recording device.. all other things being equal, then a higher bitrate is better. You could record a two hour show in XP mode....drum roll....
if you could burn to dual layer discs *8.5gb capacity. My computer card allows me to capture at up to 15mb/s If I want .. this seems overkill but nice to have the option.