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What is an "embedded broken field" ?? |
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 All Forums >> [Tips, Tricks, & Tutorials] >> Using Digital Juice Products with Vegas >> What is an "embedded broken field" ?? | Page: [1] |
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scott777 Posts: 4 Joined: 1/11/2008 Status: offline
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Folks, We've produced our first 30 second commercial in Vegas Pro 8.0a and submitted the digital file to be broadcast for TV. The tech folks at the TV station say that the video has an "embedded broken field" so can't be used for broadcast. Can anyone speculate what that means and how we can track down this error (it is not visibly noticeable to us on computer or attached TV screen). Thanks for any help. |
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What is an "embedded broken field" ?? - 
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media_explosion Posts: 1357 Joined: 3/9/2007 From: Southwest Ohio Status: offline
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What was the digital file format?
(in reply to scott777) |
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scott777 Posts: 4 Joined: 1/11/2008 Status: offline
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It was rendered as: MainConcept Mpeg 2 with custom template as follows: video 29.970 fps, 720 x 480, upper field first, CBR 6,000,000 audio 224k, 44,100Hz, Layer 2 The tech folks suggested it had to do with the graphics over the video (title) Thanks. (in reply to media_explosion) |
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birdcat Posts: 1826 Joined: 1/14/2007 From: Boynton Beach, FL Status: offline
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If someone doesn't jump in here soon, I would suggest you post the query on the Vegas forums: http://www.sonycreativesoftware.com/forums/ShowTopics.asp?ForumID=4 I'm certain someone there could help. _____________________________ DJ Counts (Hundreds+) "It is the mark of an educated mind to be able to entertain a thought without accepting it." - Aristotle My Juice: http://video.birdcat.com/djlist.txt (in reply to scott777) |
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scott777 Posts: 4 Joined: 1/11/2008 Status: offline
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Thanks - I will try that if no replies here. (also the commercial video scenes we used were .avi files captured from tape off of a consumer Canon Optura 30 mini-dv camcorder) (in reply to birdcat) |
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D. Eric Franks Posts: 2544 Joined: 11/10/2004 From: Florida Status: offline
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Shoot, sorry I missed this one. The problem is probably the "upper field first" and you need to do lower (although I have no idea what "embedded broken field" means). So (assuming you are shooting DV), your project Properties should be the NTSC DV preset: 720x480 Field order: Lower field first Pixel aspect ratio: 0.9091 (NTSC DV) Frame rate: 29.97 (NTSC) Which is probably exactly what your output settings should be. From the settings you posted - besides changing to "lower" - I would change two minor things (of course, with the caveat that whatever your broadcast engineers have told you - you should do that!): Audio: 48kHz @ 16-bit depth (this is DV/DVD standard) and VBR, 2-Pass 6,000,000 (instead of CBR - but, meh, this probably doesn't matter that much) These are pretty much the settings I'd use for DVD-Video discs, and your settings are awefully close to that already. (in reply to scott777) |
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scott777 Posts: 4 Joined: 1/11/2008 Status: offline
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Thank you Eric. Could you take a look at this link of technical requirements for the TV ad and see if you can see what we might be doing wrong? http://adwords.google.com/support/bin/answer.py?answer=78641&topic=13256 Thanks for your time! Scott T. (in reply to D. Eric Franks) |
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D. Eric Franks Posts: 2544 Joined: 11/10/2004 From: Florida Status: offline
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Looks like very standard DVD-Video MPEG-2. So, same as what I said before, especially concerning the "upper" field. That's almost certainly your problem and if you change that setting, you're probably good to go. There were some minor details in their spec that you might as well follow (easier to follow than not!): - CBR 6Mbps (minimum - I'd kick it up to 8-9Mbps if you are still under the 100MB file limit - you probably are) - audio datarate "At least 256kbps" - MPEG-1, layer 2 audio or ACC (I'd use ACC if you have the choice) So, short answer: change to upper field and leave everything else the same. Longer Extra Bonus Answer: they also say you can use QT (MOV) H.264. At similar datarates, that codec is going to give you better quality than MPEG-2. But you'll be starting the learning process all over from scratch with a new file format and new codec, so you might wanna just do the MPEG-2 one this time and experiment with the H.264 next time. I know: experimenting with encodes is about as fun as watching paint go from wet to dry to see the color difference, but it does make a difference! (in reply to scott777) |
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media_explosion Posts: 1357 Joined: 3/9/2007 From: Southwest Ohio Status: offline
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Could the error be a closed or open gop issue. I don't see anything in the spec about that, but I know it is an option when creating an Mpeg stream. Rick (in reply to D. Eric Franks) |
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D. Eric Franks Posts: 2544 Joined: 11/10/2004 From: Florida Status: offline
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Sure could be, Rick, especially since I really don't know what "embedded broken field" means. But, upper field interlacing is weird anyhow, so I'd bet a beer that switching to lower field will clean this up. (in reply to media_explosion) |
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Shaun C. Roemich Posts: 1377 Joined: 11/1/2007 Status: offline
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DV is even field first, every other format in the universe is odd field first. If you are transcoding to MPEG for the DVD, you'll need to reverse the field order in edit or in transcode. One of the growing pains with DV!
(in reply to D. Eric Franks) |
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D. Eric Franks Posts: 2544 Joined: 11/10/2004 From: Florida Status: offline
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Even/Odd. Field 1/Field 2. Upper/Lower. A/B. Top/Bottom. Confusing/Yes. DV is "even field first" only if you start counting the first line of video as "1" (top, upper) - then "2" (bottom, lower) is even. But if you start counting like an computer software engineer, then the first field is "0" and the next is "1" so lower would equal odd. Which seems to be what some software developers did and which, to this day, causes much hairpulling among editors. In any case, yes: DV is lower field first and many INTERLACED DVDs are upper, as you state Shaun and that may be what bit the OP in the butt. But the DVD-Video format is relatively flexible (as opposed to the DV format, which is not) and a flag in the header should allow compliant DVDs to be make with upper or lower scanning - not to mention most Hollywood DVDs using progressive scanning - no worries. Of course, in real life, it never seems to work out that way! (in reply to Shaun C. Roemich) |
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