rendered video has glitches

LoTN wrote on 2/26/2012, 10:33 AM

Please provide details about your project parameters and footage.

amendegw wrote on 2/26/2012, 10:35 AM

I may not be the one to help you, I'm sure you will get some good help here if you provide the following information:

1) What are the specs of your source footage? Get MediaInfo and post the results back here.
2) What are your render settings? (i.e. encoder, frame size, frame rate, bitrate, etc.)
3) What are your current Vegas Project settings? They should match the answer you gave in 1). Use the "Match Media Settings" icon.

...Jerry

Edit: "horizontal lines in the video' would make me suspect a deinterlacing problem.

webboy634 wrote on 2/26/2012, 11:49 AM

Cool utility.

And I didn't know about the match settings button so I did that.

According to the mediainfo:

Format: AVC, CABAC

Bit rate 3,000 Kbps
Max Bit rate 4,280 Kbps

640x480 resolution

Aspect is 4:3

Frame rate mode is Constant
Frame rate is 29.970 fps

Color space: YUV

bit depth is 8 bits
Scan type is Progressive

Bits/Pixel frame: 0.326.

I'm trying again to render in mp4 format, using Internet HD 720p template under Mainconcept AVC/AAC and then modifying the settings of that template to get as close to the original video specs as I can.

The lines are still there. It's close just not perfect.

webboy634 wrote on 2/26/2012, 12:06 PM

Forgot to mention; I have to change every template's option to render using CPU only.

What is that all about? If I leave it to automatic, which is the default, it throws an error every time and will not render.

amendegw wrote on 2/26/2012, 12:09 PM

Well, from what you describe, it doesn't sound like deinterlacing (unless someone did a poor job of deinterlacing the source). Can you place a few seconds of your source footage in a downloadable location?

If you don't have a service to do that, I'd recommend free Dropbox (that link will give us both an extra 250MB of storage). Copy the footage to your Dropbox Public folder, right-click, "copy public link" and post the result back here.

...Jerry

Edit: Don't worry about the "CPU only". It might slow down your renders, but it also might make Vegas more stable. And if you're getting crashes, sounds like you've done the right thing.

webboy634 wrote on 2/26/2012, 12:40 PM

http://www.djsmooth.com/videoremix.html

This is the latest render. Tried to render with settings that matched the project.

amendegw wrote on 2/26/2012, 1:08 PM

The latest render? I can't see any horizontal lines. Played it back in WMP, VLC, Quicktime player & the Vegas Preview window. How are you playing this back?

Of course, I have very old eyes. Maybe you can post a screenshot or let us know the timecode where the aberration occurs?

...Jerry

webboy634 wrote on 2/26/2012, 1:18 PM

windows media player on that same computer plus quicktime on one of my macs.

the lines are there..I might notice them only because I've been going back and forth between the original music video and the completed product.

farss wrote on 2/26/2012, 1:25 PM

This is the latest render."

Are you 100% certain there's not something in the source material?

Those lines look very much like something from an analog video tape machine, probably Betacam SP. A single line dropout might not be very noticeable in the source if dropout compensation has been used, the H.264 encoder might make it much worse.
I'd try encoding at a much higher bitrate and see if that makes any difference just to get a clue as well as going over the source very carefully.

Bob.

webboy634 wrote on 2/26/2012, 1:32 PM

Tried all sorts of renders at much higher resolutions and bit rates.

I can post the original video if you want to see that.

webboy634 wrote on 2/26/2012, 1:36 PM

One thing to note is that there is a pretty tempo difference.

I did the audio remix first in Acid Pro; cranked the tempo up to 128.

The .wav of that remix is riding under the origina music video in Vegas Pro and I had to speed up the playback of the video pieces to match the tempo of the new audio remix.

I need a pro software that can match my creative ideas. ;)

amendegw wrote on 2/26/2012, 1:38 PM

Well, I'm only working on my laptop. If Bob (farss) see lines there, then they must be there (as I'm sure he's looking at higher quality monitor than my laptop).

That said, if the lines are visible on high quality equipment but not on low quality, maybe a very light touch of Gaussian Blur might help? With the updated Gaussian Blur FX in Vegas 11, you can add as little as 0.0001

...Jerry

paul_w wrote on 2/26/2012, 1:38 PM

I dont see any horizontal lines as such, but i do see horizontal tearing in the image during any pans. My guess is, its an encoding error possibly too low a bit rate.

Paul.

Frederic Baumann wrote on 2/26/2012, 1:40 PM

Did you install any codec packs on your machine? Vegas can sometimes get confused if other codecs are installed, in addition to its own versions.

Are the problem always occurring at the exact same place (frame# and horizontal position in the frame), or is it random?

Other hint: is your project 8-bit or floating point? In version 11, it looks like floating point projects behave strangely under certain conditions. So, if you have floating point, you might try turning back to 8-bit.

Hope this helps,
Frederic - FBmn Software

webboy634 wrote on 2/26/2012, 1:41 PM

maybe it's the horizontal tearing; i'm seeing something.

i'm new to Vegas so not sure what's in the software that could fix this. i know i'm asking it to do some pretty hard work with all the video cuts and edits plus the tempo change.

suggestions?

and thanks so much for your help btw.

farss wrote on 2/26/2012, 1:44 PM

Jerry,
look at 2:18;14, it's only 1 frame long so very easy to miss.

Bob.

paul_w wrote on 2/26/2012, 1:49 PM

Analog noise as the dummer hits the crashes. Think thats from the tape Bob.

Paul.

webboy634 wrote on 2/26/2012, 1:49 PM

Yeah I've been seeing those tears or whatever at the exact same spots in the rendered video regardless of the render settings. That's mainly how I know it's still a problem.

paul_w wrote on 2/26/2012, 1:55 PM

So is it the tears thoughout the video thats a problem?, or is it as Bob pointed out at 2:18 - see white line as the drummer crashes. Those are different artifacts.

Paul.

farss wrote on 2/26/2012, 1:56 PM

Go back and look very carfeully at your source.
A single line error only one frame long could be made worse and more noticeable by the H.264 encoder.
You could try encoding to DV, that doesn't use interframe compression and see how it looks. Obviously your file size will be much bigger but it'll give you a clue as to what is going on.

I'm very much inclined to think the source of the problem is not in Vegas or the encoder itself. Digital video is either pixel based or macroblock based unlike analog video which is line based.

Bob.

amendegw wrote on 2/26/2012, 1:57 PM

"look at 2:18;14, it's only 1 frame long so very easy to miss"Ahhh... 2:18;14!! I can even see that on my laptop. Doesn't look like any deinterlace or tearing problem I've ever seen. Matter of fact, doesn't look like anything I've ever seen. On thing's for certain - ignore my Gaussian Blur suggestion. It's not going to help this problem.

...Jerry

amendegw wrote on 2/26/2012, 2:05 PM

If the problem a "one bad frame" problem, maybe johnmeyer's detete bad frame script documented here: http://www.sonycreativesoftware.com/forums/ShowMessage.asp?Forum=4&MessageID=798271 ?

...Jerry

paul_w wrote on 2/26/2012, 2:14 PM

Op says 'lines' ... I 'think' he's refering to the horizontal tearing or sheering throught the video on pans. In this 'single frame' artifact, i'm certain its from the tape supplied to the OP. Either a fault on the tape or just a spec of muck! But i suspect this is not what he's talking about. He needs to clear that up really. What is the actual problem.

Paul.

LoTN wrote on 2/26/2012, 4:15 PM

Not necessary related to pans or dissolves. Sometimes, spread on adjacent frames.

02:02,12
02:02,14
02:02,23

etc ...

even more visible during some Xfades like 02:27,21

Sure there's something wrong, doesn't look like a tape problem to me.