mpeg-2 Quality Loss

carrspaints wrote on 12/8/2004, 4:47 AM
Hi all. Another newby question. I have captured my holiday DV footage via firewire to my h/drive. This footage was filmed using a Canon XM2 (Canon GL2 is the U.S. equivalent) I have edited the footage and completed the project using Sony Vegas 5b. I then rendered this as a Main-Concept mpeg-2 file, type DVD. The video rendering quality was set at "Best", the Field Order set at "Progresive", video qulity at high (maximum) - variable bitrate, single pass.

What I have found is this: The resultant mpeg video displays still, or slow moving video and video objects with great clarity - sharp and crisp. However, any fast moving clips, or portions of video where I was panning even just slightly fast appears choppy. It is hard to explain, there are no sections of video missing, it's just that the resulting mpeg video hurts the eyes - it's kinda.....choppy, not smooth. Almost like you are seeing frame by frame very quickly. You shouldn't see the frame by frame effect, it should just look smooth?

Also - and this is a real bug bear I have been trying to resolve - I tend to get this wierd "line" effect on my videos. Again, this is more pronounced where there are fast moving, or bright objects, video or the panning has been just faster than completely still, i.e. snails pace. The lines aren't thick, or even coloured - they almost look thin, transparent, almost like one of the 520 lines of resolution has disappeared. It doesn't just happen in one area, this can occur all over and in more than one area. Most people would accept this but I can't....seems pointless having all this expensive kit only to settle for sub-standard results.

Anyway, does anyone have any ideas as to what may be causing these issues, or what I am doing wrong here? I'd be most grateful for any feedback. To confirm, I am using the PAL system XM2, with mpeg 2 rendering set to DVD-PAL. Many thanks.

Comments

mel58i wrote on 12/8/2004, 5:45 AM
Are you sure that you want to set field order to progressive?
If you are making a DVD then take the default 'pal dvd' settings which are for interlaced bottom field first. Tv's are interlaced scan - computer monitors are progressive. Probably why you are getting blurring judder effects on panning.
Try burning a DVD and playing it on the TV.

Mel.
Former user wrote on 12/8/2004, 8:44 AM
Unless your camera shoots progressive, there is no advantage to rendering to progressive for a DVD. In fact, it may appear choppy like you are describing because you have eliminated 1/60th of each frame.

Dave T2