Interlacing artifacts issue in ISO image?
I have an Oppo BDP 93 and my question concerns interlacing artifacts. I receive DVD ISO images that I burn to DVD using ImgBurn. The ISO images are of content that is filmed with an HD Camcorder. The thing is when I view these on the Oppo after burning to disc, I can see interlacing artifacts. To be fair, the same thing occurs on my PC when viewing the ISO in VLC unless I select the deinterlace option. I've contacted Oppo and they are telling me that this is an issue I will have to address before burning the image to disc. What is the best way to go about doing this whilst at the same time minimising quality loss? Many thanks.
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You "receive" these ISOs? It's possible whoever created them encoded the interlaced content in progressive mode.
Post a MediaInfo text log of one of the VOBs from a DVD with this issue. |
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Actually I download them directly from my church's ftp site. I will get a MediaInfo snapshot together later and post it.
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You don't have to make a snapshot. Use Text View in MediaInfo and copy/paste the entire Text page. Or Export the report to a text file.
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The text file is attached. I hope this will be of some help.
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I actually prefer the snapshots. :)
I can view them on-forum that way. - I recommend Greenshot for Windows. - Mac has a built-in tool. - You're on your own for Linux! Wrong tool for video anyway, worse than a Mac! Or post it as code: Code:
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As predicted:
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Scan type : Progressive Your Blu-ray player is reading the flag, so it turns off its deinterlacer. One quick and very dirty workaround would be to temporarily set the player's output to 480i. Source Direct should also send the video to the TV as 480i, I think. This way your TV will be forced to parse the nature of the incoming video content and deinterlace it using its own processing. |
So based on the way they are saving out the ISO images I am stuck with DVDs that will be fraught with interlacing artifacts no matter what I do. Is that a correct assumption?
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If you do as we suggested, you shouldn't see combing all over the place like you are seeing now. The artifacts will be things like chroma ghosting.
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The playback tips could make an improvement. All that one can gather is that the video has been improperly encoded -- but we haven't seen a sample of it, so no one can make firm conclusions.
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Not sure that chroma ghosting would be an acceptable or preferable alternative. You would think that in this age of digital wizardry that something could be done. Oh well, guess I will just live with it. Thanks anyway.
Just out of curiosity, how should they encode the images to prevent this? |
They should encode in interlaced mode, and I don't know why that's "just out of curiosity" since having them do it properly to begin with is the correct solution.
I really don't think you understand what I'm saying. Our suggested workarounds are the equivalent to forcing deinterlacing in VLC, which you seemed to think was fine. Chroma ghosting is 100% preferable to viewing weaved fields, so much so that you didn't notice it before. |
"Just out of curiosity" was simply a turn of phrase but an altogether apt one as I'm fairly certain if I suggested they encode in interlaced mode they likely wouldn't as there are too many people involved with the image processing on that end.
As for the chroma ghosting when I glanced at photos of what it looked like online, it looked rather dreadful but perhaps these were just extreme examples. However, I am playing these back on a 65" plasma which tends to exaggerate even small flaws. Is there a QTGMC in Avisynth MT guide anywhere? |
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We have scant information anyway and can't be of much help. The only info you've provided was text data about a "VIDEO_TS.VOB" file. VIDEO_TS.VOB is not a video file. It's a data file for a DVD menu screen. |
I appreciate the responses guys.
I am going to try and run some of these through Vegas when I get a chance and see how I fare there. -- merged -- I posted the VOB file because that is what I was asked to post. What should I post? I haven't had time to do anything in Vegas. Realistically though, am I looking at outrageous rendering times? The playback suggestions above will not work on this particular player according to Oppo. It looks like there should be a way to do this though and fairly quickly especially since VLC can do it on the fly. |
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The main video content on a DVD disc would be a file sequence like VTS_01_1.VOB VTS_01_2.VOB VTS_01_3.VOB etc., each of these being 1024kb or less in size. Note that if the VOB file name is the "zero" sequence file (i.e, VTS_01_0.VOB), it's not a video -- it's a menu. If you want to see what the DVD file structure looks like, try this page: http://www.videohelp.com/dvd#struct. Therefore no one can say much about your actual video because we have no information about the video itself. However, we can say that the DVD has a 4:3 menu or title screen that is not encoded as 16x9. We could also make a pretty good guess that the video itself isn't HD because (a) DVD is not an HD medium, and (b) "VOB" files aren't found on HD discs. We would also guess that if the original event was photographed with an HD camcorder, as your first post says, it's no longer HD video and has likely been thoroughly screwed up in processing. Quote:
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A MediaInfo report on an actual video VOB might be more helpful. But even MediaInfo loses some detail and can report confusing data about screwed-up video files. The best analysis tool would be a few seconds of sample video that can be posted here. A VOB video file can be opened and interpreted by a free utility called DGIndex, which is often used to cut samples from MPEG2 files for posting in forums. As far as cutting goes, Vegas should be able to open and read a VOB, cut out a few seconds, and save it with smart-rendering as a small mpg. Otherwise, there's not much more that anyone could advise. |
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By the way sanlyn, nice catch. I skimmed right past the duration and didn't stop to consider the filename either. :smack: |
sanlyn and msgohan thanks to you both for your very detailed and informative responses. I really appreciate it.
I am going to try and "mess about" with these files in Vegas but the last three weeks have been VERY busy and stressful ones for me. I will post an update though. |
Well still looking for something that will work. Never dealt with anything so frustrating in my life!
I can get satisfactory results in VLC on playback selecting a deinterlace filter but if I try to convert/save the program crashes every time. Are there no programs out there that will do this that actually have guides? BTW here is a Media Info post of one of the right VOB files: Code:
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