David Shirey
1
COW Coin
Forum Replies Created
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What I mean is the resolution won’t have any bearing on figuring out the file size. Like John was saying, it all has to do with the amount of data you tell it to use per second, and how many seconds it is. It could be 720p or 1080i or whatever, but if you set the bitrate at something, that and the length determines the file size.
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Well Steve gave you the simplest answer, which is that it’s really not possible to know the exact size for certain especially if you’re using variable bitrate, but you can certainly guesstimate without doing all that math in your head. I normally use a program called “vcalc” which you can google and download, but here’s a handy website that does the same thing:
https://dvd-hq.info/bitrate_calculator.phpThe resolution and codec you’re rendering to doesn’t really matter, just tell the calculator the length of the project and what bitrate you’re using. Or, tell it the length and what your file size limit is, in this case 3gb, and it should figure out what bitrate you can safely render at. Once a bitrate calculator gives you the bitrate, lower it just a little to compensate for margin of error. Or just tell it your project is a few minutes longer than it really is. You don’t want to have to render it twice.
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I’ve never edited a script myself. The only things I have installed outside of vanilla vegas are Edward’s Excalibur, some NewBlueFX transitions, and a script that selects events from the cursor onward.
Regarding what Stephen said, this is a rather large project wherein about 350 videos from miniDV, VHS and Sony MiniDVD camcorder discs (which are 704×480 for some reason) all need to be turned into 4:3 standard def and put onto blu-ray discs. All of the MiniDV footage was digitized to AVI and converted to mpeg2/ac3 in Adobe media encoder and DVDA insisted on rerendering the audio. The MiniDVD and VHS were done by me in Vegas and batch rendered so far using mpeg2 and AC3 Pro, none of which needed rerendering. I’ve done two blurays so far with AC3 Studio that did require rerendering. I haven’t personally noticed any significant loss in quality or hiccups with the rerendered audio, just the time involved in rerendering, but you said you really don’t want DVDA to rerender audio. Are there any specific reasons for this that I should be looking out for when I check discs?
(Spell check really doesn’t like the word “rerender” but I sure use it a lot!)
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Eek, that’s disconcerting to hear but good to know I guess. I’ll contact Sony about this one, thanks! Aside from the Pro not appearing (it still shows up in the Render As list) any ideas why the Dolby Digital Studio setting would need to be rerendered in DVDA? Is that normal or do you all use that and it works fine?
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You can use the Sony AVC setting, and choose a template that matches your project settings of 1080p 24fps.
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I can’t help solve your problem unfortunately but I can confirm that I don’t experience problems mixing h264 1080p footage from a GoPro HD and mpeg2 1080i footage from an EX1, so I assume the 1080p should be fine too.
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Okay I’ll post my fix to this in case anyone else can use it. There’s no way to “fix” the existing Sony AVC format mp4’s, but I got the latest built 511 (why don’t they do a,b,c like they used to?) and used the MainConcept AVC codec instead, with the Internet 720p preset and lowered the bitrate to 7mbps. Plays on my phone perfectly!
I’m not sure what Sony does to the Sony AVC to make it different but I guess I’ll just stick with MainConcept from now on.
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Your file size is 7 gigs because of the codec you rendered it out to. What is the destination for your rendered file, how will it be used? That should determine what codec you render it out in. Is it going to be burned on a blu-ray? Do you just need a file you can view on a computer? If the video is 1080@24p and you just want to view it on a computer, you may want to try an h264 format.
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Except the source I’m thinking of in my case is those horrid Sony mini dvd-r camcorders that burn right to mpeg2. In that case I wouldn’t think it’d be a matter of reverse engineering anything, simply copying the existing stream data into a new m2v file. Or is it the nature of mpeg2 that precludes the ability to copy some frame but not others, since it instructs the pixels that have changed from the previous frame instead of every single frame being an individual data set? But if that were the case Vegas wouldn’t be able to say that some frames don’t need to be recompressed, right? Eh, I dunno. I was just looking to shave some time off a project that isn’t good quality to start with 😛
Thankfully most people have moved on to HD camcorders which make mice manageable files.
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[Nigel O'Neill] “1) You would use the DVD import feature of Vegas, pop it onto the time line and add your chapter markers, so that when the rendered file is imported into DVDA, it recognises them.”
As a somewhat related follow-up question, if you were to do that, and if the original DVD files were done at a variable bitrate, is there a way to create the mpeg2 file without recompressing but just having Vegas just rewrite the same video into a new file? I remember several times years ago when I’d render an mpeg2 from mpeg2 footage and every once in a while it’d give you the flash that a screen doesn’t need recompression because the new bitrate was the same as the bitrate on a few frames of the original, but I’m wondering if there’s a way to forget about the template settings and just use all the original mpeg2 frames.