Re-Render Quality Question-Quick pleez=)

i c e wrote on 3/26/2009, 5:51 PM
Hey at the last minute I had to go back to a long video and add a opening title. I rendered the title to the same as the video and put both the video streams in the same timeline and did a render as to the same settings as I did before.

I know this is an obvious no-no but I don't think that I will lose quality becuase it only took 30 minutes to do the project. I don't have the four hours needed to rerender the entire thing.

Can any one cofirm or WCS tell me I really should go back and do the thing over.


Thanks mucho,

ice

Comments

jrazz wrote on 3/26/2009, 6:24 PM
If you are putting it on DVD, just add it as intro media on the DVD. Then no worries.

j razz
i c e wrote on 3/26/2009, 6:50 PM
Yeah I can't do that because I have Intro media and It is one of the buttons on the menu. hey maybe there is another way to do this but I don't know it....

thanx for the try,

ice
Chienworks wrote on 3/27/2009, 7:23 AM
Some formats can be rerendered without quality loss. Most cannot. What formats are you using?
JohnnyRoy wrote on 3/27/2009, 7:53 AM
I was in a similar situation and rendered the new intro to DVD MPEG2 and then used Womble to cut out the old intro, paste in the new intro, and re-joined the whole thing to a new file with NO re-rendering (and obviously no loss of quality). It was spectacular and only took a few minutes. Womble has saved me a few times. It's an invaluable tool for stitching MPEG's together.

~jr
i c e wrote on 3/27/2009, 8:44 AM
Thanks for getting back.
I am kinda beyond the point of buying or learning any more software at this point. I will remember that and look it up for the future.

I am rendering in MPEG2 for DVDA.

Can anyone tell me for sure that I will loose a lot of quality?

thanks mucho,

josh
DavidMcKnight wrote on 3/27/2009, 9:10 AM
Womble has a 30-day free trial and is likely the best, fastest tool for this job.
Hulk wrote on 3/27/2009, 9:15 AM
What were the compression settings of the original render? If the original render was 7000kbps, 2-pass, at max quality and you are going to DVD then I would say no, the loss of quality will be very minimal.

If on the other hand the original render was single pass, at less than the highest quality (slider), at 4500kbps then yes you will do more damage to the video than the above case. Why? The above compression settings are generally well above what is required for most DVD video. You can reduce the quality a bit and still not have the results be visible most of the time. But if the original render was already starved for bits then you will be compounding the damage with the rerender.

This is exactly why a solid SmartRender is such a great feature.

Finally, since you are the only person that can see both original render and re-render you are the best judge of quality loss.

- Mark
farss wrote on 3/27/2009, 1:54 PM
You could solve this problem in DVDA itself.
Create another mpeg file of the title.
Take that into your DVDA project.
Point Action of button that used to point to Movie to Title.
Make End Action of Title point to Movie.

The down side of this is there may be a delay in playback as the player moves the head from the end of Title file to start of Movie file. You can reduce this problem by using DVDA to arrange the physical layout of the files.


Another solution that avoids recompressing lossy mpeg-2 and avoids using Wobble for such a simple task.
Put the Title and Movie files into a simple DVDA project. Author DVD then use VOBMerge to join the two VOBs. DVDA will read that single VOB as a single title quite happily. I haven't tried this as yet but I can see no reason why it will not work.

Bob.
i c e wrote on 3/27/2009, 2:16 PM
Thanks so much guys.

Some very good options here. I did the re-render and I couldn't tell the difference. What I didn't know was if that would be something I would be able to tell or if somewhere down the line I would regret it. I did top settings (I believe it was 8million, two pass....) So I think that it will be cool.....

For next time (I think i will have to be doing this quite often, regretibly) I will try some of the meathods here,

thanks again,

josh
Hulk wrote on 3/27/2009, 8:35 PM
With the settings you just mentioned I wouldn't worry about it! Especially considering the fact that you can see a difference.

- Mark