Fast motion/jagged lines...field order problem??

[mltwitz]

I'm rendering interlaced mpeg video (ripped from DVD) to interlaced mpeg in Sony Vegas (I'm joining it with other divx/xvid video clips) and then burn it to DVD. In the beginning the results, when watched on a TV hat lots of jerky motion, and thru this forum I learned that it was due to the wrong field order. So I changed it from bottom field to top field first in the render settings, which definitely removed the jerkyness, however, when there is fast motion, I still see jagged lines along the edges of the object that moves (only when watched on TV). It doesn't look like interlace lines, the lines are much wider, it seems the moving object is cut in large slices while moving. This happens only with the re-encoded mpeg-video material, the divx/xvid content looks fine. Just to be sure I switched the field order of the rendered file around again using restream, but top field first seems the right field order, bottom field first is much worse. I also played with the Vegas project properties and found out that when "deinterlace method" is switched from none to blend or interpolate, the problem goes away, however then the resulting video is less sharp.

Is this still a field order problem or could it be my TV (16:9 HD), or other render settings in Vegas? I use a custom mpeg2 setting based on the DVD NTSC, but with a modified bitrate to keep the files size smaller, i.e. 5500 max/3500 average/500 min.

Any help is appreciated!

[jagabo]

It sounds like you resized your interlaced video. You should avoid resizing -- especially vertically. If you must resize (eg PAL/NTSC conversion) you have to use an interlace aware resizing method.

[mltwitz]

Tha is true, I use pan/crop to resize the video, so it is within the TV safe area. How do I use an interlace aware resizing method in Vegas??

[guns1inger]

Why are you resizing ?

You do understand that any DVD you watch on your TV has footage outside the safe area ?

And that the safe area is not TV safe ? The inner is Title Safe - your titles will be seen on (almost) all TVs, and the outer is Action Safe - your key action will be seen on most TVs. If you resize to have the entire image within these areas you will see black borders all around on most TVs as well.

As I said in your double-post, test burn to disc first and watch it on your TV. Your PC is the worst place to watch interlaced footage.

[jagabo]

I don't use Vegas but my guess is that you simply have to convince it your source is interlaced. I know you can right click on a video in the timeline and select the field order so maybe there are three choices, top field first, bottom field first, progressive.

[edDV]

Check my reply to your other post on Vegas. The problem isn't with resize in Vegas. Try to separate your issues.

https://forum.videohelp.com/viewtopic.php?t=324019

[creakndale]

Your description of the problem sounds like you are not resizing on 16 pixel boundaries. The result of this look similar to, but different than, a wrong field order problem. Using Premiere 6.5, I accidentally output a project at 720x486 (486 does not divide evenly by 16) and the result was what you describe. For NTSC try using 720x480.

[mltwitz]

No, I'm rendering to NTSC 720x480.

[mltwitz]

Guns1inger, this is only a double post because after I realized what the real problem is (i.e. resizing mpeg) it was more appropriate to move this topic to the Conversion section. It's OK with me to delete this post from this section. PS: I did DVD test burns to determine a) which area is visible on my TV and to exactly this "safe area" I am resizing my video and b) that the problem I encountered is truly a resizing issue if interlaced video.

[jagabo]

PS: I did DVD test burns to determine a) which area is visible on my TV and to exactly this "safe area"

Do you realize this varies from TV to TV? Even within a single television it will vary with time, heat, etc. That's the whole reason overscan exists.

[mltwitz]

Yes, I tested it on 2 TVs ad then determined what the "average" vieweable area is, that's what I mean by "safe area", it is slightly different from the safe dotted area in the Vegas viewing screen.

PS: thank you for all your suggestions and quick replies.

[jagabo]

By the way there are two field order issues: the field order of the source, and the field order of the output. Changing the field order of the output (or setting the output to interlaced vs progressive) won't fix the resizing problem. You have to make sure that Vegas understands the SOURCE video is interlaced.

[mltwitz]

Incase anyone is interested, I found a solution to the problem, it is posted here

https://forum.videohelp.com/viewtopic.php?t=324019

Again, I applogize for the double post...and thank you all for your help and valuable suggestions.