Blocky/pixelated transitions

See also here for other incarnations of this problem, although the thread seems to end without a solution in sight.
I've got a project imported from my dv camera which came in alright. Then I add a couple of wash-out/wash-in transitions, and a fade out in the end. Alas, the wash-in and fade out create blotchy and pixelated frames.
Any tips? I've got iMovie HD '06, Sony DCR HC 42 NTSC, if that matters...
PowerBook G4 17 1.67GHz Mac OS X (10.4.5) TiBook Gigabit Ethernet, B/W G3, Win2K, WinXP

Hmm.. No one?

Similar Messages

Blocky Pixellated .M2T Import of clips trimmed in MPEG2VCR

Hi all,
I have a strange problem with CS3 that I was not experiencing with PPro 2.0. This is on a clean install/format/OS on a new machine, XP Pro, Quad Core Pentium, 2GB ram, two 500gb sata drives. (I tested and the same problem happens on my older machine, so it's not machine-specific.)
My workflow is I have many, many short .M2T clips 1080/60i from the Canon HV20. I can import these raw clips into CS3 fine, no problems. However, with most, I use Womble MPEG2VCR to first "trim" the clips and delete some unwanted footage at the beginning and end of each clip (and to save HDD space). This does not re-encode the clips, and I save the trimmed clips to a new TS file with the .M2T extension.
In PPro 2.0, these 'trimmed' M2Ts played perfectly and could be edited just fine on the timeline, adding transitions/effects/etc. alongside the 'raw' untrimmed M2Ts. However, now in CS3, when I import the MPEG2VCR trimmed clips, I get a 1st frame of all red, then after terrible pixellated and blocky playback, with some all red frames interspersed in there as well. I am just guessing, but it seems like CS3 has lost knowing where to find the I frames and is having a problem putting back together the sequence of IPB frames.
Strange thing is, if I save the trimmed clips as an MPEG Program Stream file (.MPG extension) in MPEG2VCR, those clips import and play perfectly in CS3. When I look at the properties of both files in CS3, all the details are exactly the same for both files (except size, the MPG file is just slightly smaller than the M2T version).
I know the obvious and slightly sarcastic answers to my problems :) -- just import as MPG! Or don't import M2Ts at all! Use an intermediary like Lagarith lossless AVI or Cineform! But I really don't want to do that, as I have thousands of M2Ts I need to import and don't want to convert all of them to AVI if it's not needed for my rather basic editing needs. And I'm concerned if I import some clips as M2T and some as MPG, if I then go to export the finished timeline as M2T there may be a problem. (I know probably not, but i'd feel safer keeping everything consistent as M2T for the importing).
So does anyone know how to fix this problem? I know I could go back to PPro 2.0 but I have a big investment in CS3 and I like its new features. Thanks guys (and gals) for your help in this forum.
Regards,
Patrick

Thanks Howard.
As another experiment, I tried trimming an M2T file in Womble MPEG Video Wizard DVD (their replacement for MPEG2VCR) and the trimmed clip again plays back pixellated in PPro CS3 but ok in other programs.
Rather than just throw in the towel and go back to 2.0, I'd really like to know the root cause of why this is happening, and why the files work ok in 2.0 but not in CS3. My understanding is that a TS file (transport stream) and MPG file (program stream) are identical except that the TS (M2T) file adds a few additional error correction bits for carriage of the signal over less reliable carriers, like broadcast. There must be something with those bits that are changed by trimming in MPEG2VCR, even though it is supposed to be a GOP-accurate editor, which other players can correct for but not CS3.

Pixelated transitions in imovie 2008

I have little experience using imovie & I have a 2008 mac, with 2008 imovie - Im working on a photo montage and have tried to use the fade transition between pics. When I export to a higher def MP4, the pics themselves seem OK, but the transitions between pics are extremely pixelated. This is going to be shown on a large screen, so I cannot have the degree of pixelation I am seeing. Id like to have some transitions between pics, but thus far my plan is remove all transitions to avoid the pixelation.
Please advise! Am I doing something wrong? Do I need to change settings? Any advice is appreciated!

Hi Tony,
welcome to this forum
I'm afraid:
you should start your project from the beginning....
my guess: you imported your footage WHILE the demo was open in the timeline of iM, right? that is NTSC stuff; now, iMHD allows to import different video standards into one project, but that is not best practise, and can reuslt in very cheap quality of project....
choose New Project, in the settings choose "25" - less intuitive, that stands for PAL... which has 25fps (but who know that?) besides, 30 is NTSC....

Pixelated Transitions

I made a simple slideshow of photo stills in iMovie that I imported to iDVD. When I play the burned DVD (I tried on several different DVD players) some, but not all, of the slides are initially VERY pixelated....after a second or two the slides snap into focus. (I use a simple Ken Burns effect on each slide.)
Is this a problem with
a)iMovie,
b) iDVD,
c) the DVD discs I'm using
d) the burn process
e) the DVD players in my house
f) random goblins....??

then clicked the "Create iDVD Project" button that appears within iMovie
If you look at the iMovie application you will see this is an option under "Share" - silly name!
It lets iMovie render your photos and generally foul them up DON'T USE THIS FOR PHOTOS. Instead open iDVD, select a new project and then drag the .mov file of your iMovie project onto the screen, then burning with best quality should show an improvement as iDVD will render the slideshow.
Give it a try.

Blocky/Pixelated dark scenes in iMovie 11

HELP!!
I ripped a DVD to my desktop at a pretty high quality using handbrake. It's a full-length movie weighing in at 3.35 GB. I then imported that movie into iMovie 11 so I could edit out some language. If I view the movie full screen from the Event Library section in iMovie 11 it looks fine. As good as the newly ripped version on my desktop. When I highlight the whole movie in the Event Library and drag it into the Project Library as a new project, it turns to garbage. Horribly pixelated dark scenes to the point that it is not even viewable. Thinking that this was just a problem with the preview window when viewed in full screen, I edited the video and burned it using iDVD. It burned just as badly as it looked in the Project Library. There must be something happening between the Event Library and the Project Library that is just killing the video quality. Any help/suggestions would be extremely appreciated.
Relatedly, is there anyway to edit a video using iTunes? It looks fine in that program.
Thanks

However, you are still not going to like the results of your ripped MPEG Streamclip DV-video when imported into iMovie 09 or 11. The quality will get degraded by nature of the latest iMovie programs.
To keep the DV (non-pixelated) quality, and to export the same, you would need to use any of the following: Final Cut Express (for a bit of the "pro-sumer"), Adobe Premier Elements 9 (consumer video editor that is a lot like iMovie 06), or get your hands on the old iMovie 06.
Again, these are what are necessary to edit your ripped DVD and keep them looking as nice as the original.

Scaling video without dithering pixels

Hello,
I've performed some screen capture that I've imported into my Premiere CS4 project. Occasionally I want to zoom in, but Premiere chooses to dither (or "smooth" or "interpolate") the image whenever it's scaled. I'd prefer it not to resample, and instead to keep the blocky pixels of the image (as if you were staring closely at your computer monitor).
Any ideas on how to achieve this effect?

Zoom in reeeeeeeeally close.

Pixel Aspect Ratio Issues-FCP HELPP!!!

Okay folks, so currently I am putting together my reel in FCP, however I am encountering a few issues. So my source formats are different in pixel aspect ratio, some was shot on the 7D, some on the Alexa, and some on super 16mm, and a few after effects animations. However all of it is HD, and in ProresHQ 422. My problem here is when I import all of my media into FCP if the timeline is set to square pixels, the HD(1440x1080) footage looks squished, and if I set the timeline to HD(1440x1080) the square pixel footage looks blocky, pixelated and super square.
That said, some of the footage from the 7D is labelled as square and some is labelled as HD(1440x1080), and all the after effects stuff is square.
Right now i am dealing with it and just leaving my timeline as green-preview render, so everything looks mostly normal. However whichever format is not that of the timeline, the footage is degraded a tiny bit, so that when I pause the footage it looks great, but in preview it is slightly blurry.
My question is, is there a way to format everything as either square or HD(1440x1080), so it looks normal, or is there a way to use mixed media formats and not have the preview blur. I'm going crazy over here, as I just graduated and am in dire need of a reel so I can begin to apply for jobs, etc....Or is there a way to formate my prores setting to transform everything to square pixels?
Thanks guys!

You can use compressor to convert everything to square pixels, however there's no need to worry about how it looks in fcp when it's playing but not fully rendered. Try exporting a short section (mark an in and out around the section - and going file: export: quicktime Not quicktime conversion) with current settings. If you render the material, it should look fine when you play it within fcp. Unfortunately, the render settings in the sequence menu are not particularly intuitive, but do a little playing around with them if you've got the time.
I prefer to convert all my sources to my intended pixel dimensions, frame rate and codec before I edit in fcp, but it may not be necessary in your case.

Premiere Pro 2.0 - output is lossy/blocky

I've been having trouble with PP2, in that my shiny source footage exports as lossy/blocky/pixelated no matter which codec etc I use. If I try to burn direct to DVD, I get the "insufficient space on the disc" error. Even if I do nothing except import some footage into a new project, whack it onto the timeline, and then export it, the output is not anything like as good-looking as the source footage was. Why would this be happening? What should I check?
I'm running Vista on a newish 64-bit machine.
Cliff

Cliff,
Welcome to the forum.
We will need a lot more info to diagnose the issues. This ARTICLE will tell you what info would be very important, and also how to gather much of it.
Please post that info, and someone can likely help you track down where things are going off.
Good luck,
Hunt

HELP: Pixelated dissolves on m2vs

Hi there -
I know this is not a new issue, but am wondering whether it has been resolved.
I have edited DV footage in FCP. It's DV-NTSC 48k, nothing special. There are fade-ins and fade-outs created within FCP.
The exported Quicktime movies look great. But when I burn DVDs, the burned DVDs show incredibly blocky, pixelated regions on the fades. Seriously, it looks like the worst web movie you've ever seen shown fullscreen.
I've been reading forum discussions on this issue and have tried different compressor settings, including one-pass CBR and Quicktime export to MPEG-2 (I have the components). Nothing seems to work.
I am under deadline. Can anyone help me? I've heard Bitvice is great but I'm on a student budget and already own FCP, Compressor and DVDSP.
Thanks!
BB

I should have added that I am using FCP 5.0, Compressor 3.0.3 and Quicktime 7.5.5, and burning with DVD Studio Pro 4.0.0.
If there's another way to help me, please let me know.
Also, does anyone know how I can preview different test clips? I don't want to waste a whole bunch of DVDs burning short test clips, but DVD Studio Pro hasn't shown the blocky pixel issue; it's not till I see the burned DVD that it seems to show up, although that may be a monitor size thing.

What caused this blockiness - dirty heads?

http://idisk.mac.com/denis.murphy-Public/viking.jpg
Not a FCP question, but I could do with some opinions. I lent my Canon XH A1 to a friend last week and he shot two hours of video at an event. He's not a pro shooter, and didn't really test the camera beforehand, although he did spend a few hours familiarising himself with the controls. None of the video is usable (see link). I assume this was caused by dirty heads. AFAIK he never got the "dirty heads" warning that the XH A1 is supposed to flash up in the viewfinder (not that you'd depend on that).
I've cleaned the heads since, and can't reproduce the problem. He was shooting DV-Pal anamorphic. The tape brand is Sony DVM60 ME, bought new from a reliable dealer. I've shot test footage at the end of one of his tapes, and there were no problems.
The weird thing is, if I play back the tape on a Sony handycam, the blockiness is not as pronounced, although still unusable. But on the Canon, the footage seems to deteriorate with each play,
My friend captured all his footage to FCP from the Canon and the blockiness on his capture is not as pronounced (similar to when I play back in the handycam).
I know this footage probably can't be saved but can anyone have a look at the link and confirm that this is in fact just a dirty head problem? I don't want this to happen to me on a shoot!
I've had the camera for a couple of years (very lightly used) and never had a problem with dirty heads.
Any ideas?

Been talking to my friend again, more info:
He did a short test the night before the shoot and there were streaky dropouts on the tape (Tape 1). He thought it might be a bad tape and re-tested with a different tape of the same brand (Tape 2)). The re-test was a static shot with no movement, and it looked fine (in retrospect, the buffering could have masked the problem). So he went ahead and did the shoot using the Tape 2 and another tape (Tape 3) of the same brand.
He didn't review Tape 2 in the field, so we can't say if it was good. Rechecked a couple of shots on Tape 3.
He got home and captured Tape 3, as it was still in the camera. Good footage, no problems. Tape 2 however played back with blocky pixels. He cleaned the heads at that point, but the blockiness persisted. He nevertheless captured Tape 2. Both tapes were also checked on a different camcorder. No improvement.
On playback again in the Canon camera, the tapes deteriorated further. Tape 3 (the good tape) is now unusable, but luckily he got a good capture of this one.
I thought it might be a tension problem and FF/RW'd the tapes a few times, but no improvement.
Does it make sense for a head clog to appear, disappear, and reappear after shooting and capturing an entire tape (Tape 3)? And then destroy tape 3 on further playback? Or could there be something more sinister at play?

Pixelation Problem in Compressor

Hi
I've been reading threads from a few people who have been having a similar problem...I've tried a few of the suggestions but I'm not having any luck. This problem has occurred on large files that I burn to a dual layer dvd and also on smaller files that fit on a single layer. I export a movie from Final Cut 5 and run it through Compressor 2.0.1 If I compress using any of the vbr settings, my dvd (which I burn in DVD SP4, ends up with significant pixelation. Any motion in the scene at all is surrounded by blocky pixels. This is strange because I have been using the same versions of these programs and the same settings for a long time and have burned tons of dvds that have all looked great. Then, suddenly, a couple of weeks ago, everything started looking pixelated. I tried using the "one pass" setting. That eliminated the pixelation but I don't think the image quality is as good as I would like.
In one of the threads here, it was suggested that the Compressor 2.3 update might resolve the pixel issue. But, I believe you need version 2.1 in order to install the upgrade. I can not find a free version of 2.1 to download...can it be downloaded for free? Or must it be purchased? I have a feeling it would fix my problem but I can't seem to find it. Any suggestions?
Thanks in advance...
Joe
G5 Mac OS X (10.4.8)

Have you tried adding compression markers to that specific area in Compressor?
Have a look at this article: http://www.kenstone.net/fcphomepage/compression_chapter_markersstone.html

Pixelation with Final Cut Pro HD

This question has probably been answered many times but overall in Final Cut Pro I've been having a problem with it and I just want a final explanation (FCP 4, FCP HD, FCP 5)
Whenever I add a title to my video, I do my basic render and play it back with cinema desktop preview, and it looks a bit pixelated. I can understand that my dv footage looks bad, but my titles look BAD when played back. I have everything at the highest settings. I can always SCRUB and frame by frame view my video at the high quality I would like but when I play it back it turns pixelated again. When I use a T.V. to view my external video, it looks fine, but it would be helpful if it looked good on the computer monitor.
Can somebody answer my stupid question?

First, you might want to view the footage in QuickTime Player. But be sure check your preferences so that "Use high quality video setting when available" is checked. If it is not pixeled in QuickTime Player with this setting enabled, your problem is with Final Cut playback settings.
If the footage is showing pixelization in both apps, you are probably experiencing artifacting, which is a natural effect of all digital compressed footage. You can minimize this by using the highest quality format available when editing. It is normal for footage to get pixelized in footage with alot of motion or fine detail. I'm assuming you're using DV format or HDV format. Both of these have this problem.
If you would like to try something that might help this, visit www.natress.com. Under the free plugins menu you'll find an experimental FCP plugin called G Low Pass which claims to limit the amount of detail in a scene when things get too busy. This reduces the likelyhood of artifacting when applied to DV footage and it seems to help in a very subtle way.
As for DVD playback having occasional large, blocky pixels, it could be a small scratch on the DVD surface, or perhaps a poor burn. But if the footage has the same problems in QuickTime Player, the DVD isn't to blame.

Newbie pixelation two-part question

I want to create video mash-ups from various sources including public domain material. I am finding that a lot of what seems readily available online is pixelated-looking, even stuff that has had attention paid to it, i.e. made available in multiple formats such as this one - http://www.archive.org/details/Night.Of.The.Living.Dead_1080p
1st Question - Is anyone aware of the best way to obtain good copies of public domain materials - wether it be sites such as archive.org, torrents, or ripping from dvd's? I have used the .m2ts version of the Night of the Living Dead video available from the Internet Archive (archive.org), and it has a pulsing blocky pixelation effect within Premiere Pro that I managed to get rid of once by saving and rendering, but has returned. It is a rhythmic pulsing of random areas which show either black or white in large pixelated blocks.
The second part has to do with matching that sort of public domain footage up with my own footage taken with a canon 7d and also with the sequence settings within premiere pro cs5.5. I'm going for a wild and chaotic atmosphere in my video, so there is room for some roughness, but I'm wondering what the best approach would be to start with. i would want to start with the best quality possible.
2nd Question - Can a mash-up project like I'm talking about be produced to a relatively professional level from these non-licensed non-official online sources? The final export looking good and non-pixelated is my main concern.
Camera - canon 7d
Computer - mac pro
Software - adobe premiere, after effects, soundbooth
Goal - producing a variety show made up of old film clips and new footage.

Hi,
It was never completely clear whether it was just hidden or whether Apple ran a download page for iChat 6.
As the Download for Messages Beta was separate and "Deleted" iChat it would seem it would be another download for iChat 6.
iMessages will not function as it is only an Account type within Messages and iChat 6 does not have it.
Therefore messages on the iPhone will not sync to the Mac. (until you get Mountain Lion and Messages in that OS X version).
Mountain Lion and it's full version of Messages will not sync the iMessages that have happened in between the 14th December 2012 (end date of Messages beta) and the Install of Mountain Lion if you decide on that route.
8:51 PM Sunday; May 5, 2013
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

Anybody know about VBR and CBR?

Hi,
I'm using PPro CS3 at the moment since I can't get CS4 to work very well on my computer.
On exporting.
I would like to export- adobe media encoder -to Flash video and to quicktime.
I'm sure I used to be able to set VBR 2 pass etc etc with different mbps.
Have I lost these? Can you point me in the right direction?
I only seem to have CBR settings?
I am using CS3 v 3.0 (I don't want to install update to 3.2 as when I did this all audio sync went out by about twelve frames- the ability to batch capture vanished too)
Thanks
scott mackenzie

Scott,
That particular video was encoded using VP6 2-pass VBR, 650kbps, 480x352, from Sorenson Squeeze for Flash v5.0.4.10. I use the VP6-E profile--the VP6-S profile is more if you're exporting HD-sized videos, but since this is originated from SD there's no need to incur extra decoding cycle. I turn on auto keyframes, and generally leave it around the Squeeze default; you may need to edit this setting depending on the footage you're encoding. Leave compression speed set to "best"--this is a counter-intuitive setting that actually should be labeled "compression quality" or have options ranging from "slow" to "faster". "Best" means the encoding runs slower, but results in a higher quality output. Strange, but true.
I crank the minimum quality slider up to about 70-75; this keeps the compressor from getting a little too overzealous. I find that it prevents some blockiness when transitioning from one scene to the next--and in my experience, the added file weight is pretty minimal for the quality gained. If you have fairly static footage with few transitions, you can gain better compression ratios by leaving the minimum quality slider set to a lower threshold. It's these settings that let VBR do its thing.
I never, or at least I haven't yet, enabled the "drop frames" setting. Unless you're trying to compress and distribute HD-sized videos, I think the prevalence and speed of high-bandwidth Internet connections negates this. On the other hand, if you need to stay within a certain bitrate threshold, like for some sort of hardware playout device, you'll probably have to experiment with this in order to produce files that meet the requirements of the hardware. For general web distribution, I've never found the need for this.
For sharpness and noise pre-processing, you'll again have to experiment. There's no magic number for these: it's going to depend on your footage and your tastes. They will both slow down encoding, and can have either a positive or negative effect on your video. I will sometimes use noise pre-processing if I'm encoding from DV or the like, to try to eliminate some of the noise and grain. This makes for a more efficient encode, because the compressor isn't trying to preserve details you don't want to see. These two settings sort of need to work in concert with each other, because one is going to blur the footage to remove noise, and the other is going to sharpen it and bring it back to a certain extent. I suggest experimenting with a short section of video, going with the extremes and then a couple settings in the middle--you'll quickly see the difference. I probably had sharpness set to 5-7, and noise pre-processing set to about 1-2, for this particular video. I think the result is quite clean.
Finally, I leave the minimum/maximum VBR and undershoot settings where they are--haven't needed to tweak these yet. These get pretty technical, and are again really the crux of VBR 2-pass encoding. They are what allow the compressor to "bit budget" an allocated bitrate for a given passage of video, and make sure that the final output stays as close as possible to that allocated bitrate. So far, the defaults have done the trick for me.
One note that I should probably explain, and that's to do with frame size. You might notice above that my output dimensions are 480x352, and not 480x360, as you might expect for a 4:3 video. This is because On2 VP6 (and many other codecs, like H.264) operate optimally in what is called mod16. What this means is that a mod16 codec will first break an input stream into 16x16 blocks, then 8x8 blocks, and then other sizes like 8x4 and 4x4. If you use a dimension that is evenly divisible by 16 (like 352 pixels high) you maximize the efficiency of the codec. I suggest doing this by cropping, and then scaling--not by scaling alone. I typically leave the "Maintain Aspect Ratio" radio button selected in the options, set one dimension (height or width, whichever), and then experiment with the crop filters until you get the other dimension evenly divisible by 16. Once you find the magic number, save the crop filter as a preset and save yourself some headache later! The crop filter will have to change depending on your export size--sometimes you'll crop vertically, and sometimes you'll crop horizontally. And it will also change if you're exporting to a 16x9 file. Sadly, that math stuff we all got into video to avoid will rear its ugly head yet again ;)
Good luck, and let me know if you need any other assistance. The biggest thing to remember is that there is NO magic formula to encoding, regardless of the source footage, the destination, or the codec used. Experimentation is really the only way.

Making a 300 image "movie"

My project is to make a DVD containing 300+ still images (from a digital camera) with timed music with 4 chapters. I'm using iMovie 09 and iDVD 09. I know iDVD can do slide shows but I have too many stills. I authored the show in iMovie 09 but when I get near 100 stills (with transitions, Ken Burns & other effects) in the project, iMovie gets a little unstable, slows down and sometimes crashes from writing too many "commands" to the "assembly file" (for lack of better words). So I make 4 separate iMovies and it stays very stable. I want the entire show to "play all" AND want to be able to pick the 4 chapters from a DVD sub-menu.
If I "share" the iMovies to "large media browser", I can import them into iDVD but it won't play all 4 in sequence as one show. I can drop each iMovie into a 4 cell iDVD "slide show" and they can play fine but I have no chapters and no ability to "PAUSE" or "FAST FORWARD". The image quality is great going from iMovie - share to (large) browser - import to DVD - and author using "High Quality" setting for the 70 minute show.
So to get chapters, I exported the 4 individual iMovies to a QT container using AIC (960x540). Then I re-import them into a new iMovie project, place them in sequence and place my chapter markers. ( I don't own QT Pro.) This will "sew them together" to one big movie with markers. Then send it direct to new iDVD project, set up my chapter sub-menu and burn a disc. The image quality is much degraded and noticeably poorer when the DVD is played. I tried exporting the 4 mini-movies using H.264 "Best Quality" codec and I get the same thing - poor image quality. .dv export wouldn't be any better, I'm thinking.
Took weeks to make the 4 individual iMovies, so I can't start over in iMovie (HD) 06, which I still own.
What am I doing wrong? I thought exporting and re-importing would be close to "loss free". Would you suggest doing my "sewing" and chapter marking in iMovie 06 and send it to iDVD from there? Does iMovie 09 drop alternate scans when exporting to QT?
Again, sending one of the mini-movies to media browser for iDVD and the images look great even when I use "Best Performance" instead of "High Quality". Export and re-import in iMovie 09 and it looks "crummy" (technical term for an expletive). Also noticed a little drop in audio volume in the movie compared to the menu music volume. Is this an expected result of my double path process?
TIA for your expert suggestion of how to do this. Thanks
Message was edited by: Mac Friendly
Message was edited by: Mac Friendly

Mac Friendly wrote:
.. QUESTION: When does iMovie 09 drop alternate scan lines? At ALL exporting? (Even to QT?)
it drops..
• NOT on import = all clips in Events contain 100% quality, whatever you do in Projects..
• NOT if you use speed, dissolve or fade ONLY in a Project
• ALLWAYS, if you use any OTHER 'effect' (e.g. page curl, a map, a background, any title), on ANY clip in the Project.. therefor on any export setting
the intended workflow is, you shouldn't export manually, but Share to MediaBrowser (=which creates a 540/h264file.. ), which appears in the Media/iM tab in iDVD.. you've tried that way?
did I mention my suade .. ?
consider:
• iDVD creates videoDVD, which has - by standards - 720x480.. a fraction of your original pics and what your Mac's screen offer..
• watching such a disk on a computer or HiDef-flatscreen in 'fullscreen mode' means, each pixel gets zoomed by some factor of up to 4 .. => 'blocky', pixelated look.
• for finally judging pic quality, you should use a 'tube'/CRT TV ..

Blocky/pixelated transitions

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