Blocky video

[leszektrojanowski]

Just an enquiry really.
I work with loads of mpeg2 files and I've recently noticed that with the current version of Corel x8 I get a bit of problem with frames. I use various types of mepg2 files including NTSC ones, and I do know they should never be rendered to PAL, however in the previous versions of Corel I didn't have a lot of bother with it. I save my project to DVD PAL as majority of files are PAL anyway.
When I watch the completed projected on DVD, I get a lot of 'blocky' interference, almost like an ice cube was flying across the screen from time to time.

I've included a screenshot to illustrate the issue:






And here there are the properties of the original NTSC file:




And the file rendered to PAL:




Please note, I live in the UK any my DVD player/recorder is PAL only.

Hope there is a cure for this.

Thanks,

Les

[skier-hughes]

Blockiness is normally caused by compression, if it is not there in the original video file.
It's hard to tell from your picture, as I can't see what the content is, can you upload a very short video sequence showing it?
When you convert the video, you degrade it and change it's properties, VS doesn't do a proper job of conversion, it doesn't change things like black burst etc. When you make a new mpeg file, you recompress the old file, so the compression algorithm takes affect. Moving items will suffer most, such as panning or filming a racing car, whereas, for example a talking headshot will fair better.