TMPGEnc outputs "vibrate" at top of screen

[wkulecz]

TMPEnc looks really good except for one flaw. I've made one VBR MPEG1 following Doc's settings, a couble of VCD standard MPEGs and an SVCD standard. All show a "vibration" during playback on the top edge on every computer I've tried it on using every MPEG playback software I could fine. Note that the image is not jumping or vibrating, just the top scan line or two.

I started with a feild order A DV avi file (720x480) as sent to the camcorder and produced 352x240 or 480x480 outputs.

Actually its not confined to just TMPGEnc, Its there as well on the VCD made from the same input file with MSP6 using the bundled Ligos and NTSC VCD template. Its just the overall quality is so much worse than TMPGEnc that this artifact is not so obvious. In either case its not that noticable until you play back full screen.

Is there a fix?

I hope this will not be visible if viewed on a TV via a standalone DVD player because of overscan. If it is, I won't be persuing VCD or SVCD any further until I find a fix.

--wally.

[Dr Mordrid]

There are a couple of possibilities. The first is that the capture has in it a scanline or two from the vertical blank interval. This is a "blank" area between frames where broadcasters can store data. Examples are teletext (Europe) or Closed Captioning (US). If this occurred it can show as a scanline or two that exhibits random bits here and there at the top of a frame.

This can also happen if you're using interlaced video with a reversed field order or have TMPGEnc set up for non-interlaced video while feeding it laced.

The first thing I'd check is in the Configure/Advanced menu of TMPGEnc. The default video source type is non-interlaced. You might want to change this to interlaced.

Also check the default field setting. The options are to either convert odd to even or vice-versa. Try reversing it and see what happens.

Another thing that may help on this page is the crop filter. In a pinch you could use this to crop the top couple of scanlines to get rid of the artifacts. Get the options for any of the filters by doubleclicking on its name. If you don't want to cut those lines entirely then opt to use a black mask. It's on the crop fliters options page.

Dr. Mordrid


[This message has been edited by Dr Mordrid (edited 30 December 2000).]

[wkulecz]

Thanks Doc!

Seems there is 4 lines of unsteady video at the top of my firewire captures from my TRV7000 bottom of the line D8.

Interlaced settings seem right, but I'll try reversing in case TMPGEnc order A = MSP order B.

Setting the crop to 4 lines on top and using black mask seems the simplest option right now.

Great quality and convienence, especially since TMPGEnc can input from >4GB files on w2k! DV file as ready to go to the camcorder via firewire for VHS tape encodes nicely to VCD or better yet SVCD. Now to find authoring software for SVCD.

--wally.

PS -- while I was proofreading, my quick test with reversed field order seems to have fixed the problem too, so it looks like at least for my system and camcorder MSP field order A == TMPGEnc Feild order B.