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Error occurs when rendering quicktime!!
So.. I am trying to export a feature length film (62m) off of vegas 7 into an uncompressed NTSC DV quicktime (7) file as to hand over to a post house to transfer to Digibeta… But, the unfortunate thing is every time I render the file out, and I’m talking 21 painful hours of render time, it goes all the way to 100% and the progress box closes and a message appears saying “An error occured. The file could not be created.”
I then did a few tests. When I render out a minute segment it works fine. The Uncompressed DV data for a minute ends up being like 3.75 gigs (quality is up to max), so it’s not hard drive space that is the obstacle, I have around 300 gigs on the drive which is more than enough for a 62 minute film.
I cannot figure out why the QT file won’t be created.. and I need to figure this out soon to get the Digibeta to the ATL film festival… please HELP if anyone has information.
p.s. I am now trying an .avi file.. would the quality be any different between an uncompressed .avi in comparison with a uncompressed QT file?
-Adam Maurer
Chautauqua Films -
5 Replies
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Adam,
Sorry to hear about your troubles with a deadline approaching.
My best suggestion would be to find a level of compression you can live with. Completely uncompressed will create huge file sizes, as you’ve found, and that is probably what’s blowing up your render attempt. Just too big of a single file at 62 minutes (imagine a single 232.5 gb file) for the computer to handle.
Photo Jpeg A and B both look really good, and are about 1/6th the size of the uncompressed.
On top of that, you may want to ask the post house what kind of file they want. If they are going to put it in a NLE, they may not want to have a uncompressed file.
AND
you have to think about what the orginal footage was? Was it shot on some format that already had compression? If so – going to an uncompressed master doesn’t really make sense. It would be best to keep it the same kind of compression that came out of the camera.Other than that – if you have a video card you could rent a Digibeta deck yourself and dump it to tape.
Good Luck.
John Bollenbacher
10engines -
> you have to think about what the orginal footage was? Was it shot on some format that already had compression? If so – going to an uncompressed master doesn’t really make sense. It would be best to keep it the same kind of compression that came out of the camera.
I agree, if this is DV footage just render a DV AVI file. Vegas has a really good DV codec. Optionally you can render as Quicktime using the DV/DVCPRO – NTSC codec. I would also ask the post house which they prefer.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
John,
I finally got an uncompressed AVI file to work, and it looks great, as the post house wanted an uncompressed file.
I was under the impression that uncompressed files yielded the best quality and that digibeta was a virtually lossless format in that if it were to be output uncompressed it would end up being a 4:2:2 color stream instead of 4:2:1 of DV. Am I wrong about this, or is a true uncompressed file created on intake through SDI? And if wrong, is there any benefit to uncompressing DV, or even HDV for that matter?
I guess I just have this idea in my head that if you shot something compressed (as in DV), if you uncompressed it you would get the best quality..
-Adam
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> I finally got an uncompressed AVI file to work, and it looks great, as the post house wanted an uncompressed file.
Excellent! It always pays to ask.
> I was under the impression that uncompressed files yielded the best quality
Yes because it does not compress the video, but if something is already compressed, it will not look any better. It just won’t look worse.
> and that digibeta was a virtually lossless format in that if it were to be output uncompressed it would end up being a 4:2:2 color stream instead of 4:2:1 of DV. Am I wrong about this,
You are wrong only because you can’t create color information that is not there. NTSC DV is 4:1:1 and PAL DV is 4:2:0. Rendering uncompressed just gives you a 4:1:1 stream with no compression. Nothing will make it 4:2:2 (even though it will be stored that way on digibeta tape) because the color information was never recorded to the DV tape to begin with.
> or is a true uncompressed file created on intake through SDI?
That’s correct. You need to capture uncompressed via SDI.
> And if wrong, is there any benefit to uncompressing DV, or even HDV for that matter?
No, there is no benefit to the signal other than it is not degraded.
> I guess I just have this idea in my head that if you shot something compressed (as in DV), if you uncompressed it you would get the best quality..
No. Once you compress to a lossy codec, the information is thrown away forever. You can never get it back. If you compressed to a lossless format, you never lost the information to begin with. But DV and HDV are lossy formats.
If you want to test this, take a JPG file in Photoshop and save it to a new name on the lowest quality setting (highest compression). Now open that file and save it at the highest quality (lowest compression). It will not look any better than the lowest quality setting because once the information is lost, it is lost forever.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
I was always told to make sure the volume I’m exporting to is in NTFS format and not FAT when saving large files. That would require a wipe of your drive, but might help with future large projects.
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