Hey!

Well, I've been doing some test renders, and I was surprised to find out that with kdenlive and the default mpeg2 rendering profiles, the results were much much better than rendering with ffmpeg through the commandline.

I specially noticed that kdenlive renderings are not blocky at all (no artifacts), and that still images do not jitter so much.

I studied a lot ffmpeg (flag and flag2 parameters, etc etc), and I could never get such good results with apparently the same parameters kdenlive is using...

What I wanted to know is if there are any other ffmpeg parameters hardcoded into the profiles that kdenlive uses, or if MLT has anything to do with this better quality rendering...

No ffmpeg render flags are hidden (as far as I know), but some things are done before the final output in ffmpeg.
Do your renders involve rescaling, for example?
Please give some more data.