Artifacts in filtered video

I have imported SD anamorphic footage from several cameras from a brightly lit stage performance. One of the cameras was a consumer camcorder on a locked-down long shot that has brightness and contrast problems (small bright people on large dark background made the people too bright, too much contrast). So I am trying to use video filters to adjust those shots to better match the other cameras.
Using the Quicktime Brightness and Contrast filter plus the Quicktime Sharpen filter, I found settings which look pretty good. And on some of the shots, those render and play fine. But on other similar shots, when I render with the same settings, I get an unstable image, with flashes of varying brightness/contrast and color.
Is there a way to eliminate these artifacts? Or are there other filters that produce the desired change without such artifacts?

Do they oscillate on a regular basis? That would the
keyframes cycling.
With various compression settings I have sometimes observed regular oscillations (with an obvious change every second or so) as well as more general "noise" sometimes, where the background sort of shimmers continuously.
Thanks for your reply. Still looking for optimal MPEG2 settings! The best I have yet found used 1 pass / 8.2Mbps / "Good" motion estimation, with modest use of noise reduction and sharpen edge filters.
best
M Rogalsky
MacBook IC2D 2.16

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70D - bright lights cuasing artifacts when shooting video

I'm getting lots of artifacts created by bright light sources when shooting video. It seems to be the intensity of the light and not the type of light that is the problem. They show up in the picture as a kind of mirror reflection, often in green, on a different part of the image. Any ideas how to avoid this?
Canon 70D, 50mm 1.8, NTSC, 30fps, 1/60 shutter, no filters
video shows the problem http://youtu.be/iCAiGoJCGSM
The bottom of this pic shows the green reflections from the lights at the top

metice wrote:
Thanks Tim, the lens is the Canon 50mm 1.8.
I'm using a UV filter - is it worth taking this off?
I'm quite disappointed because it's very noticeable on many night shots which have the light source in the frame. Anything else that can be done to lessen the glare, apart from changing the lens?
Hi,
Yes, those are definitely optically related flare effects.
And, yes, definitely try again without the UV filter, especially if it's an inexpensive, single-coated or uncoated filter. Any filter will increase flare effects when shooting in tough lighting situations like these, a high quality multi-coated might minimize it but still is likely to show some add'l flare. Cheaper filters can do horrid things to your images, potentially blurring them and causing focus errors, in addition to increasing flare effects.
Try using a lens hood, too. That physically protects the lens, but also can minimize veiling and other types of flare from bright light sources just outside the image area by preventing oblique light from striking the lens. The 50/1.8 has fairly well recessed front element, but a hood might help even more. Since you are using the lens on a crop sensor camera, instead of the OEM hood (which is designed for full frame), you might look for a 52mm screw-in hood designed for a short telephoto.
Unfortunately, you will still see some flare effects... The 50/1.8 isn't the best lens dealing with flare. The EF 50/1.4 and Sigma 50/1.4 both are better, but of course they cost more. Also, the 5-bladed aperture of the 50/1.8 contributes to the appearance of those flare effects... The 8-bladed aperture of the EF 50/1.4 or the 9-bladed aperture of the Sigma 50/1.4 give somewhat nicer background blur results (the eight curved blades or the premium EF 50/1.2L can be even better, but that's a rather pricey lens).
You also might experiment with stopping the lens down a little... both the Canon EF 50/1.8 and 50/1.4 are sharper at f2.0 or f2.2 than they are wide open. You might find they control flare better at a bit smaller aperture, too. I'd experiment with f4, f5.6 and f8, too.
A zoom lens likely would be worse than using a prime such as you are doing. But some zooms deal with flare pretty effectively.
Also watch the viewfinder and try slightly changing your position. Even just a little change can make a huge difference.
Compare these two images I made with my 24-70/2.8L.... I could see the flare occurring in the viewfinder and all I did to dodge a lot of it was change my position slightly.
I nearly always use a lens hood. Here's an example of the difference a lens hood can make. The EF-S 10-22mm lens has a huge lens hood that's a bit of a pain to pack. (Most Canon hoods reverse neatly on the lens for storage in minimal space. The 10-22mm's hood is just too large diameter to do that comfortably in any of my camera bags.) I thought about using the lens without any hood, since it's very shallow and doesn't seem it would be very effective anyway, so I did the following test shots...
As you can see, the first shot without the hood showed a very strong ghost flare. The second shot, after simply adding the hood, shows no flare at all. Note: it was a breezy day, so the clouds moved a bit while I was installing the lens hood. But, obviously the hood is effective. So I carry and use the hood, even if it is a bit of a pain.
Finally, there are times when flare effects can work for you, might actually add to the image. For example, I think that's the case here...
Above is a bit abstact... it's the sun reflecting off the corner of a building and was shot with an EF 100/2.8 USM macro lens. I think it would be pretty boring without the flare effects.
Regarding filters... I have various that I use, too. Including UV for "protection" (plus C-Pol and othersfor different purposes). They are all stored in my camera bag until actually needed. I never leave a filter on a lens all the time. IMO it's sort of silly to expect much real "protection" from a thin piece of glass (I've actually seen lenses gouged and damaged by broken filters). And there are just too many situations such as yours, where a filter can do more harm than good in the images. Another imporant factor... I use mostly B+W MRC and Hoya HMC or SHMC filters, which are high quality, multi-coated. There are other high quality brands... in fact most manufacturers offer different qrades at different price ranges.
Plus, when using a filter, it's even more important to use a lens hood as well, to keep oblilque light off the filter.
Alan Myers
San Jose, Calif., USA
"Walk softly and carry a big lens."
GEAR: 5DII, 7D(x2), 50D(x3), some other cameras, various lenses & accessories
FLICKR & PRINTROOM

Import miniDV (Sony DCR-TRV33E) leads to artifacts in the video

Hi,
I hope there is someone who might help solving my issue.
I am using
Mac OS X
Premiere Elements 11
Sony DCR-TRV33E (miniDV Camcorder)
The import from a miniDV with add media functionality from DV is loading the video from the tape.
However, on the Apple screen there are disturbing artifacts in the video like shifted columns. The material is not useable at all.
Importing the same material into iMovie is leading to correct results.
Using the iMovie imports via add media from file into Premiere Elements leads again to the artifacts mentioned.
The import into Premiere Elements shows also a warning message stating that for certain listed items the file type is not supported or a different codec is required.
It looks like that the artifacts are caused by the rendereing of the miniDV formated video in Premiere Elements.
Is there anything missing I need to configure or install?
Do I need to install a Codec? If yes, where do I get it from and how to install?
Thanks,
Henning

The material was recorded using the same camera and connection was with FireWire (otherwise capture miniDV vide owouldn't work).
I uploaded a quicktime .mov file demonstrating the artifact - you can find it in the T-Shirt at the throat:
http://kruse-hg.gmxhome.de/miniDVArtifactsInPremiereElements.mov
Using iMovi this artifact will not occur.
Thanks,
Henning

Artifacts flashes on video rendered by After effects CS5

Hello,
Since one or two months, when I render a AVI with CS5, I have some artifacts on my videos.
Those artifacts occur mainly at the begining of the video (first 10 sec), It's like very short flashes (one frame).
After 10 sec it's almost good.
Even when I render a black video (no layer, nothing in composition), I have this issue.
If someone have a lead?
Thx U
Rendering a Black video:
One different type of artifact on this composition, but same king of short flashes:

I have the problem with all AVI / with quicktime export (no conpression)
With a export with h.264 codec, the problem disapear...
About my sources, it can happend in any case, because as I told you, with just an emplty composition, I have the problem.
I will try to download the last update.

Artifacts in flash videos as of today

hi there,
when i booted my computer today, i got a notice about an
update available for flash player, so i figured "ah why not..." -
ever since then, i keep getting very nasty artifacts while watching
flash videos. i tried uninstalling and reinstalling the flash
player two times already but it doesn't seem to have any effect...
the artifacts look like this:
http://img152.imageshack.us/img152/1989/flashartifactsei8.png
i'm using xp pro and tried watching those videos with both
opera and internet explorer - same problem.
[edit]
already found out the answer myself - rebooting seemed to do
the trick (or maybe it was the fact that i updated the graphics
card drivers before i rebooted? but i don't think so...). should've
known... oh well...
[/edit]

Ah, went away for me upon updating to the latest version of DirectX (before that, it went away if I disabled hardware acceleration for Flash, but with the latest version of DirectX installed I could keep it on).
I'm not sure if my problem was identical to OPs tho, as mine only flickered briefly at the very beginning then played fine. Nonetheless, maybe it will help someone.

Weird audio artifact in my video timeline.

I have what appears to be an audio clip showing up on my video track of the timeline. Cant get rid if it unless I restart FCPX. It is neither an audio clip or a video clip. Just a visual artifact that covers up clip on timeline. May have begun after I loaded lion.

Can you post a screen shot of it?
I have noticed on some of my student's Mac's that FCP X does have occational screen re-drawn issues.

Export Filters - Video Handling?

I can't seem to get access to exported video files from an export filter - anybody know if its possible?

Hi Rob,
It isn't possible, and I verified this with Adobe when I tried it almost a year ago.
I did try to work around the limitation by starting with the same input "photos" as the export but there were a some fatal flaws with this approach:
the only logical place to work with this information was before the files were written to disk, and the expected names were not available at this time.
if the user adds a filter to exclude videos that could have been exported, your plugin will never know about it and the videos that have been excluded
only certain file naming presets allow you to guess the name the files will be assigned by the export. Any naming using a sequence number (for example) makes working with video at the time of export impossible.
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Encoding (video artifacts)

I'm having trouble with artifacts in the video I import into idvd 6. I am editing HDV in Final Cut Pro 5 and have been exporting my video as a Quicktime Movie. I have also tried using Quicktime conversion, and various codecs but no matter what I do, there are severe artifacts any time there is movement in the video (plays just fine as a Quicktime file though, I only see the artifats in iDVD.
Would appreciate any help!

Hi
Karsten pointed at one important factor NTSC or PAL and keeping the
same setting the whole project trough.
I wonder about - How much free space there is on Your internal hard disk ?
Should be > than 20Gb. Less than 10Gb can give various strange behaviour
like extreme long coding-times and I got some DVDs with strange quality
reductions.
Just a thought from Bengt W

Tutorial: Converting Video for iPod (Read BEFORE You Post)

Since 1/2 the bandwidth is about the same question - how to convert (Filetype X) to iPod video (MPEG-4 or H264) - here is the simplest and FREE method using one piece of FREE software and the ability to do a bunch at a time in a batch process.
-------------------MPEG-4 CONVERSION FOR IPOD----------
Start with a muxed file, e.g. MPEG-1 or 2. I am starting with an MPEG-1 music video clip. Update: MPEG Streamclip 1.5 now accepts almost all video clips, AVI (with the right DIvX or 3ivX codecs installed) and QT. So open whatever you have in Streamclip and follow these steps:
Open in Streamclip
Select File Export to QT (or new setting: File Export to MPEG4)
Big window opens. Select the codec from the top pulldown- Apple MPEG-4 Compressor
Select 40% quality (this lowers the bit rate and makes the file smaller and conform - at 80% the file is 120MB vs. 10 MB at 40%) as you don't want huge files.
Under Sound Select AAC audio codec and 128 kbps
Under frame size pick 320X240
Click Make Movie and where it will go of course.
On my G5 a 3'46" MPEG-1 music video was converted to a 10.1 MB mov MPEG-4 file in about 25 seconds. With a single G4 that might be 3 minutes. Bitrate is: 370 kbps video and looks fine at the actual size in QT and will look OK on the similarly tiny iPod screen. I was quite impressed by quality for such a small movie. I could goose it up to 50% or 60% to see how bit it gets but it looks good at 40% There may be a sizeable increase in size per 10% increase so before btach processing 100 try one at 40 or 50%.
-----------IF YOU MUST HAVE H264------------
Open MPEG file in Streamclip: Select the (new) Export to H264 setting that doesn't crash like 1.3.1 did - or you can use these steps and see which is faster if at all. Which allow you to use the preset in QT Pro to export to iPod format (which is H264 and takes a long time).
Select Apple Animation as the codec for Compression at 100% quality
Same sound setting as above
Pick the frame size that says (Unscaled) next to it such as
352X240 is common for MPEG-1 videos.
Make Movie - this results a huge file. But you can get rid of it later.
Open that huge file in QT Pro.
Do file export and pick the preset at the bottom that is "Movie to iPod"
It will figure out the settings. It may (it will)take a while but you get a M4V file in H264. My clip done this way took about 40 seconds to the Animation step and about 10 minutes for the QT to H264 step.
--------------------BATCH PROCESSING-------------
Select the batch list - it opens, you add files as many as you like, select convert to Quicktime, then follow the step above once, select the destination directory and then start and it will do one after another in sequence. Note the preview window that opens is the actual post-processed file and you can see at roughly iPod size how it looks in real time or as fast as you can process anyway.

H.264 is going to be slow. No doubt about that. It's still a new codec so it's expected to take a while to compress versus MPEG-4.
I remembered when MP3 was still new ... my 233 MHz P2 machine was just chugging along.
When Ogg Vorbis came along, I would expect the encoding time to be somewhat slower. I was right to a point but that was when I have yet to own a computer that's 1 GHz.
The same deal with compression schemes. For instance, I have found RAR, StuffItX, and 7zip to take it's sweet time, if using the highest settings, compared to ZIP on max compression.
I expected no different with H.264, albeit the encoding time is a bigger difference compared to, say MP3 vs Ogg, but I have learned that when new codecs and compression schemes come by, I expect them to take longer than what I've been accustomed to as I used different machines. It's either that or I buy a faster computer. For the record, it takes me between 2.5~4 hours to convert a 24 minute video to H.264 using my iBook listed below, depending on the complexity of the video.
The quality of H.264 is rather nice for 320x240, sometimes even better than MPEG-4 using the same bitrate and resolution setting, but the output filesize is sometimes smaller than the H.264 cousin because it compresses rather well.
However, let me tell you that I'm rather spoiled when it comes to certain technologies. If the iPod says that it supports 2.5 Mbps MPEG-4, I'll use that setting first and then compare the visual quality of a 768 kbps H.264 file. Most of the time though, the DVDs I've encoded doesn't even come near 2.5 Mbps. It's more like 500~1500 kbps.
Personally, I usually stick at 100% quality and use the Limit Data Rate feature. It's just that I get annoyed even by the smallest artifacts on portable video and the less artifacts I see, the less annoyed I get.
Just thought I'd share my 2 cents.

Artifacts in QuickTime 6 (cross post from OS9)

I often play (and encode) videos in QuickTime in OS9, and they have artifacts on playback, i.e. little colored squares that appear randomly and fade away after a few seconds. It appears to be a playback problem only, i.e. the artifacts are not actually encoded in the video--if you replay the same clip, you get different artifacts! For a long time, i assumed it was my video memory going or something, but i just installed OS9 on another Mac (G4/AGP) and... same thing!
Is this a known problem with QT? Or is it an OS9 problem?
The artifacts appear on video encoded using the Apple MPEG4 codec, the DivX5 codec, or the 3ivx codec. However, they DO NOT appear when the video was encoded using the Sorenson MPEG-4 codec for OS9. Someone else (everyone else?) must have experienced this.....

Are you saying that even if the video was encoded properly, QT can generate artifacts on playback if the processor isn't quite fast enough? Shouldn't it drop frames (i.e. stutter) instead..?
Yes, to an extent. This normally only happens in the case where the data rate is unreasonably higher that necessary and that can be handled by the platform involved (i.e., not simply slightly higher) which I don't really consider a case of being "encoded properly" as you put it. In this case, what you normally see is a series of frame freezes being displayed which may or may not contain block pixelations due to incomplete decoding of sub-matrix blocks (i.e., frame decoding is exited/halted before the frame being processed could be completely decoded. In this case entire segments of the movie containing dozens to hundreds of frames are being dropped/skipped between the display "freezes." This is an extreme case which is very much less common than excessively low data rates and/or using excessive keyframe intervals which produce pixelation artifacts that either fade when the next keyframe is generated or fades as the predictor-corrector algorithm oscillates back above the critical minimum data rate allocation. As to the specific differences between Sorenson and QT encoding implementations, I have always asumed the former was targeted more for low data rate use while the latter was targeted more for quality consistency over a wider scalability range. However, I may be wrong here and since you have provided no specific information as to what settings were used, how you define a "proper encode" and have not provided specific example clips for analysis, about all we can really do at this point is guess at the cause of your issue.
I'll try it on my somewhat faster 1GHz G4 and see if that plays okay, but i still can't believe a 500 MHz G4 (the one generating the artifacts) could be too slow to play a 320x240 MPEG-4 video properly.
I might agree with you if I knew more about how you encoded the content and the settings used. Most of the problems I am discussing are more common with MPEG-4 Part 10 encodes which is 2 to 2.5 times as efficient as MPEG-4 Part 2 but more CPU intensive. Basically this means the QT version of MPEG-4 Part 2 requires 2 to 2.5 times the data rate of a QT MPEG-4 Part 10 file to achieve the same level of quality but can process the content with the same or less effort. Have you tried comparing the same content encoded differently in a frame by frame comparison using the same player app?

I need to put the -Time Code- numbers running on the video... help

OhI have FC Express.. I have Effects:Video Filters:Video: Blink, De-Interface, Flicker, Image Stabilizater, Shift Fields, Stop Motion Blur, Strobe & Viewfinder...
No Timecode generator or reader here... ?

That's correct. There isn't one.
Piero has one.
http://web.mac.com/piero.fiorani/iWeb/PieroF%20FCE%20Effect/Welcome.html

My Videos Export in Terrible Quality

I have a video project I'm working on, I've finished it and went to export as .wmv and .mov . When it finished exporting, I watched the videos, the quality was terrible. Any part of the video that had a lot of motion would look "liney". I've posted the videos so you can see what I mean. I realize that there are sections of the video that are un-rendered, I've taken care of that.
http://cornerstonemin.org/myvideo/Hava Java.wmv
http://cornerstonemin.org/myvideo/Hava Java.mov
How can I fix the problem, it's not when I import it because I use iMovie 6 to import than transfer the clips to FCE4 to work on them and edit. I've tried importing through FCE4 but it doesn't make a difference in video quality.

your links seem broken… but, you said they seemed liney… maybe you forgot do de-interlace.
de-interlacing makes your video so that it's proper for viewing on a computer screen.
there are two ways to de-interlace you footage in Final Cut Express:
1: doubble click on one of the clips to bring it into the viewer, then go to Effects —» Video Filters —» Video —» De-interlace. You can then copy and paste that filter to all the other clips in your video.
2: export using quicktime convertion, select quicktime movie, and then click options, click on size, and click "de-interlace source video"

White corners with flashing "REC" home video style filter?

I'm looking for a template or some type of filter to put over a few video clips to make them look like home video - with the white 'photo' corners and a flashing 'REC' symbol in red or similar in one of the top corners.
Is there a place where I can get this?
Ideally if it would change the quality of the video to make it look more home video like it would be ideal, but not essential
Anyone have any ideas?
Thanks

This can be done within FCE.
Effects>Video Filters>Video>Viewfinder.
Stylize>Add noise. Or similar filter, there are plenty to choose from.
Once the filters are applied open the Filters Tab in the Viewer to manipulate them to suite your taste.
Al

Flash Quicktime Export leaves artifacts

I have a simple frame per frame based animation of graphical objects with audio. When I export it as Quicktime Movie I always get artifacts from moving objects left behind. For example a simple blue circle on white ground, leaves parts of the circle behind and parts of the background inside the circle.
I have tried every possible option (compressed as Animation, H264, uncompressed, double framerate etc.) in Flash Mac CS4 and its always the same problem. Now I thought this bug would be fixed in Mac CS5 or CS 5.5 but no, its still the same.
Anyone else having that problem?

Alright so I figured out what happens. I currently work with the CS5 version of flash and when you go to export a movie using quicktime, quicktime has settings like this:
click the quick time settings button and you get this:
you may want to change the size for whatever purpose, but that's not what causes a problem. You want to click the settings option to get this:
Alright here is the technical part of the explanation: These are Quicktime's Settings, NOT Flash CS5's. If your frame rate doesn't match the frame rate for the motion part of this window you can/will have artifacts in your video in quicktime. This is NOT a bug. It makes sense that your video may have artifacts because it is glitching with the difference in frame rate. I know this is super hard to figure out what happened, but it works. All you have to do is change these settings to match your frame rate, or you can change your initial frame rate in the original animation in Flash.

KDE4/KWin: graphic effects artifacts

Freshly installed arch with kde4, nvidia-340xx drivers (260gtx). Tried using every opengl version and Qt graphics system.
Effects still misbehave. For example, a notification popup will have a shadow around it. After the notification disappears, the shadow does not. Moving the mouse will result in the leftover shadow flickering.
The same sometimes happens with "active glow" effect.
And that's the weird thing: the artifacts can appear for a few notification windows in a row, then work fine again. I can't seem to detect a pattern.
Disabling all effects gets rid off the artifacts.
The GPU itself is working fine, I'm not getting any artifacts when playing videos with mpv, or using windows.
System is freshly -Syu'd. Full specs: see win8.1 system in sig.
Any idea what might be causing this? If you need more info, please tell me.

I think I solved it as well. Disabling the X Screen 0 -> OpenGL options -> Allow flipping option seems to get rid off all artifacts.
Here's hoping the option will stick after reboot...
Btw, switching to openGL ES broke blurring for me, it has displayed other parts of the screen instead of the blurred/translucent taskbar. Tripple buffering didn't solve things either.
edit: spoke too soon. The artifacts appear again, but a bit differently. With flipping enabled, they were flickering, with it disabled they are persistent. Looks like the buffers are not being cleaned up properly or something.
edit2: I think I figured it out. It seem that setting animation speed to either "fast" or "very fast" breaks the shadow effect. All other settings work fine. I guess I should open a bug for kwin...
Last edited by Soukyuu (2015-02-19 19:08:34)

Artifacts in filtered video

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