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Pixelation occurring in fast moving objects in the foreground
This is an odd occurrence, fast walking people in the foreground of my DVD are becoming pixelated…..for lack of a better term. Original footage was shot in 1980 X 1080 60i………edited in Vegas 10 then rendered to MPEG2 DVD Architect Wide-Screen format for Authoring in DVDA 5.2. This problem is not visible when playing the MPEG2’s in Windows Media Player, nor is it visible when rendering .wmv versions for the Internet. But when I play the finished DVD on my home TV from a Blu-Ray player, people moving in the foreground are pixelated, making my DVD appear extremely unprofessional. So the logical conclusion is it’s my Blu-Ray player. Are their known issues with playing home-made DVD’s on a Blu-Ray player that are causing this problem. I want my clients to see the BEST version of the footage I can, and as it is, it’s just not up to par. Any ideas guys? I would provide a screenshot, but this phenomenon seems only apparent on my TV. Something I can’t show you, short of filming it……..now there’s an idea!
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9 Replies
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I was going to ask you a screenshot, until I read the end of your post…
On some TVs you have a ‘freeze’ button letting you hold the current frame. If you have this feature, you might then take a shot of your screen and send it to the forum.
Very puzzled about how the DVD player is able to guess what is in the foreground, moreover if your movie does not have 3D information.
The only thing I am thinking of is that the player does some kind of down sampling, being limited in processing power. Then the most impacted parts of the picture could be the most moving ones.
Did you try to plug your PC (the one on which you run Windows Media Player) to your TV, instead of the DVD player?
Did you try to adjust the bitrate when rendering?
Hope this helps
Frédéric
Frédéric—
Want to match colors between clips? new plug-in here.
Check FBmn Software plug-ins to fix white balance and exposure issues.Want to learn on Sony Vegas Event Pan/Crop tool? Watch my video tutorial:
https://library.creativecow.net/baumann_frederic/Sony-Vegas_event-pan-crop-tool/1
Or about Keyframes? https://library.creativecow.net/articles/baumann_frederic/Animating-with-Keyframes-in-Sony-Vegas.phpFrench version: https://geo.creativecow.net/fr/a/12999
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Frederic, thank you so much for responding! Yes I agree it’s a strange problem. I didn’t adjust the bit rate, but I did choose “Best” instead of “Good” in Full-resolution rendering quality. Could that be the problem? I haven’t connected my PC to my TV, as it’s upstairs, and my work computer is in my Recording Studio. I will try to see if it has a freeze function, and get a screenshot to you. It’s only people either walking or running past in the foreground, the rest of the footage is clear. Again………thanks for trying to help me out.
Pixel format: 8-bit
Full-resolution rendering quality: Best
Motion Blur type: Gaussian
Deinterlace method: None -
Could you also check the bitrate and let us know?
The lower the bitrate, the higher the compression, the higher the pixelation. So this might explain the phenomenon (but would not explain why it’s different between 2 screens).
—
Want to match colors between clips? new plug-in here.
Check FBmn Software plug-ins to fix white balance and exposure issues.Want to learn on Sony Vegas Event Pan/Crop tool? Watch my video tutorial:
https://library.creativecow.net/baumann_frederic/Sony-Vegas_event-pan-crop-tool/1
Or about Keyframes? https://library.creativecow.net/articles/baumann_frederic/Animating-with-Keyframes-in-Sony-Vegas.phpFrench version: https://geo.creativecow.net/fr/a/12999
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I thought I mentioned at the bottom of post #2 that the bitrate was 8, in Properties? Or did you mean the bitrate somewhere else? My render settings are the default DVD Architect wide-screen MPEG2 settings. I made no changes to those default export settings. And to be clear, the Internet exports were in .wmv format. Playing both that file and the MPEG2 file, within Windows Media Player, yields no odd results on my computer. So I’m sure you’re right, it’s either my brand new Sony TV or my brand new Sony Blu-Ray player. Guess I’ll have to drag my computer upstairs to troubleshoot that. I’m going to re-render all my footage first, to make sure nothing is wonky there. Screenshot footage coming in a few minutes.
Ok Frederic, as promised here is some footage http://www.robjames.net/pixelation.wmv that shows the problem. Notice the guy running at the bottom of the screen, right to left. That happens with everyone who moves fast. The slight blurriness of the mid foreground people is not a problem, as it’s the result of filming my TV screen, same goes for the poor audio quality. My only concern is to remedy the pixelated people moving quickly in the foreground.
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Sorry typo. The link should have been https://www.robjames.net/pixealation.wmv
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Got you! The video capture helps a lot!
I was speaking of bitrate, not of pixel format (8-bit in your case). Bitrate should be around 10 Mbits/second, and is a setting of the renderer.
Anyhow, it does not matter anymore, because I think your problem is not pixellation, but interlacing (not sure of the English word, sorry). It looks like you have horizontal lines which are not scanned synchronously (as in every digital movie btw), and this appears on speedy moving areas. “Pixellation” appears horizontally only, not vertically.
I am not expert at all on DVD standards, but it might be one of:
1) a mismatch between odd/even frames. Try changing the field order when rendering. You certainly have input clips which are interlaced, and the field order is not properly set.
2) (less likely) you rendered your movie with a frame rate that is not compatible with DVDs. As a result, a reader on the computer is OK because it renders frames differently than a TV set, and so, is more tolerant. For instance, getting the picture frame by frame, and displaying a frame only once it has got all its scan lines — as opposed to a TV set, displaying every scan line as it gets it, without waiting the whole frame to be received by the reader or the antenna).
3) other issue – no more idea.
Please let me know if this helps fixing the problem,
Frédéric—
Want to Match Colors between clips? new plug-in here.
Check FBmn Software plug-ins to fix White Balance and Exposure issues.Want to learn on Sony Vegas Event Pan/Crop tool? Watch my tutorial.
Or about Keyframes? Watch this one. French version here. -
Ok, thanks for sticking with me on this issue. So you’re thinking it is a Interlace problem, ok let’s pursue that angle. To that end I’m going to be as precise as I can be about my original footage and what I’m rendering it out as. Original footage is:
Video is NTSC 1920 x 1080 x 12, 60i, 29.970 fps. Alpha = None, Field Order = Upper first, AVC.
Audio is 48,000 Hz Stereo Dolby AC-3
Rendering settings are:
Video is MPEG-2 DVD Architect NTSC Widescreen video stream, 720 x480 29.970 fps. Lower field first, YUV 6 Mbps, Pixel Aspect Ratio: 1.2.12 Video Quality High (31) Variable Bit rate Max. 9,500,000, Average 6,000,000, Minimum 192,000. DC coefficient 9 Bit. Allow field based motion compensation.
Audio is AC-3
Ok, right off the bat the first thing I notice is the field orders are opposite, so I’ll switch the render settings to Upper Field first, and try that. I’ll let you know how it goes. If you have time look through the other settings and see if anything stands out as incorrect. Thanks for your help! -
I do think the problem is the one about field orders, and can see no other issue with your settings.
Did you try a new render?
Frédéric
—
Want to Match Colors between clips? new plug-in here.
Check FBmn Software plug-ins to fix White Balance and Exposure issues.Want to learn on Sony Vegas Event Pan/Crop tool? Watch my tutorial.
Or about Keyframes? Watch this one. French version here. -
Thank you for sticking with me through this issue, Frederic, it’s appreciated. Well it turns out changing the field order did improve things slightly, but still there is an interlacing problem on fast moving objects in the foreground. I guess I’ll just have to live with it, but it’s far from the quality I was expecting from my new Full HD camcorder.
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