Why does Vegas render fuzzy avis from MPEG2?

riredale wrote on 5/21/2003, 11:40 PM
Just noticed something curious. I dragged an MPEG2 file on the timeline, and then asked Vegas to build a DV avi out of it. If I then drag the avi to the timeline underneath the MPEG2 file, I can easily switch from one to the other by just clicking the "mute" icon on the top video track. If I do so, I notice that the MPEG2 image in the preview window is MUCH sharper than the DV avi built out of the same MPEG2 file. In other words, it appears that the MPEG2 decoder is building a very fuzzy avi when asked to render.

Am I doing something wrong?

Comments

Paul_Holmes wrote on 5/22/2003, 12:37 AM
You must have something set wrong and of course I don't know what. I just took an mpg and the DV avi I created from it and did the same test and the avi looked just as sharp as the mpg. I also did this many times in Vegas 3 (using 4 now) and was always extremely pleased with the results.
mikkie wrote on 5/22/2003, 12:21 PM
Far as I know rendering/editing from an mpg2 is not recomended, with the possible exception of a higher bitrate mpg2 consisting of all I frames. WHen you do, Vegas (or whatever editor) basically has to generate the missing frames (stuff between I or key frames) and depending on the codec and original mpg2 compresion settings, this can give a less clear picture.

I *think* mpg2 can also be a kind of funny animal, looking better on screen rather then representing the underlying data for a particular frame, and again this can be made better or worse depending on the original video.