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DVD Archicitect 4.5 (24.00 vs 24p +2-3/23.976) Tech Question.
Here is my question in short:
…..In either case, why could we not use this 24fps format over the 24p format? Why will DVDA 4.5 take 24 fps under the 24p+2-3 (23.976fps) format but not the straight 24fps? Why can we not change the frame rate under the optimization function? Is there away around this? Is it even worth pursuing?
Here is my reason for the questions:
Ok…so I know the routine: DVDA 4.5 does not have to recompress the Mpeg-2 already lossy format again after rendering in Vegas 8.0 when I use the handy DVDA 4.5 format presets.(Great time saver) Also I’m well versed with that shortcut and have known this as the proper DVD standard burning format for DVDA 4.5. (Sparing anyone the time to explain this feature again)
My standard routine involves downloading from my Sony DCR-TRV70 DV/AVI through firewire to Vegas 8. Use editing to a minimum in Vegas 8 then render final project using the “DVD Architect NTSC Widescreen video stream encoding preset for DVDA 4.5”. I Also use the AC-3 5.1 preset for the audio stream for DVDA 4.5 etc…for the quick no hassle shortcut method for burning my DVD projects.
Lately I’ve been thinking outside of the box for a change, to try my hand at even better quality DVD’s in every aspect of the technology, even with standard DVD’s short comings. In short, I have done many short trial and error renderings. Messing with all the functions on the video side of things in the “DVD Architect NTSC Widescreen video stream encoding preset for DVDA 4.5”. I mostly get really big files with really crappy encodes with really long encoding times.(To be expected while experimenting)
However, I have found in my case, a gem. I found that using the straight 24 fps instead of the default 29.970 fps under the “DVD Architect NTSC Widescreen video stream encoding preset for DVDA 4.5”. (Not the “DVD Architect 24p NTSC Widescreen video stream encoding preset for DVDA 4.5”). will yield better quality. The only problem is DVDA 4.5 will need to re-encode it to the 24p +2-3 format. I have tried both formats and I see considerable quality differences between the two. (24fps being the best) I like what I see with 24.00 fps which is wearily confusing. From what I have seen, it is a better quality render under Vegas 8 for DVD’s.
I’ll ask these questions again in light of my situation:
….In either case, why could we not use this 24fps format over the 24p format? Why will DVDA 4.5 take 24 fps under the 24p+2-3 (23.976fps) format but not the straight 24fps? Why can we not change the frame rate under the optimization function? Is there away around this? Is it even worth pursuing?
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4 Replies
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> ….In either case, why could we not use this 24fps format over the 24p format?
Because the 24fps format is for printing to film which really does have 24 discreet frames per second.
> Why will DVDA 4.5 take 24 fps under the 24p+2-3 (23.976fps) format but not the straight 24fps?
Because 24.000 fps is not part of the DVD spec and therefore is an illegal format that set-top DVD players will not know what to do with. 23.976 fps is the standard speed for “24p” DVD’s.
> Why can we not change the frame rate under the optimization function? Is there away around this? Is it even worth pursuing?
It won’t let you change it because that would produce a non-compliant DVD. Now way around it. Not worth pursuing.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
I’m actually curious what quality difference you see. Can you qualify it at all?
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Sure you can try this if you like. (Start with a DV source) Firewire it in if possible. Throw it in Vegas. Find a jittery section in your clip.(5 seconds or less) Use any and all DVD Architect presets without changing any parameters. Then use the DVD Architect NTSC Widescreen video stream preset. Change the default frame rate to 24fps. Then compare them under any media player capable of playing Mpeg-2 formats.
It seems to work all around on shaky videos, quick movements, digital animation, (after motion blur is applied), and picture stills seem to be more vibrant. This will make the rendering longer and the file larger but not by much.
Unfortunately DVD specs (As I’ve been made aware of) will not allow it! But it seems that recompressing it from 24 to the 29.97 and/or 23.976 needed DVD format makes little difference in quality. Even though you have to render it again you’ll have less time involved and a smaller file the next time around. (At least in my situation)
I have not had the time to mess with all the variables yet but I hope this helps.
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Thanks for the info!
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