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Problem w/ MPEG-2 Output (Update — ALL video output)
Hi all,
(Update — I just checked and found the same issue with an UNCOMPRESSED .avi file as well. side by side picture here (public folder of my dropbox): https://dl.dropbox.com/u/7783580/video%20problem.psd )
I am having a problem I’ve noticed previously and ignored, but on this particular project it is too noticeable to push aside, so hopefully someone has an answer for me–
When I output to and MPEG-2, using the default NTSC 4:3 and through all the variations I’ve experimented with, I see the video during some static segments go “out of focus” and blurry — particularly noticeable in this case because some of the static graphics have very fine lines that look awful when this happens. I want to be clear, this isn’t constant, it honestly looks like a camera slightly losing focus.
I have assumed this may be related to the GOP sequencing somehow and have tried messing with the number of I/B frames with no apparent success. Can anyone shed some light on this topic for me?
Thanks,
Scott -
5 Replies
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It looks like an interlacing issue. (as an aside, I would recommend just saving your images as jpg files or png files so others who don’t have photoshop can open them).
A couple of options:
1. Use VLC to playback your files and choose under the video options to blend the fields under deinterlacing. I don’t particularly trust Windows Media player to give proper results.
2. Check to make sure your fields are lower fields first LFF if you are using standard def formats (or when you render, change the field order to progressive).
3. If you are going to watch it on a computer monitor that is progressive, render it out as a progressive file format (30p or 24p instead of 29.97i if you are in NTSC land).
Fine lines and standard def interlaced footage doesn’t always go well together. At any given time you are only seeing half of the actual image.
What I saw on your link didn’t necessarily look out of focus as much as it looked like an interlacing issue.
j razz
https://www.jrazzcreations.com
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Same results in vlc.. I know it isn’t actually out of focus, but in real time playback it goes From what you see on the left to what you see on the right.
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Did you deinterlace and blend your fields in VLC? Did you try any of the other options?
j razz
https://www.jrazzcreations.com
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It looks like the rendered file is a lower resolution than the left one. Drop the videos into GSpot and see what they are. If there the same res, I would try increasing the bitrate for the mpeg and see if it helps. Danny Hays
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Danny–
These are both still frames from the same rendered video. They are seconds apart. It looks like the left, then after a second or two, blurs and turns into what you see on the right. So I have a good resolution, then the problem resolution in the same file.
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