Re: [MPlayer-users] Having problems ripping a telecine dvd [León:the professional Director's cut]

Jonathan Rogers jonner at
Fri May 9 07:18:59 CEST 2003

D Richard Felker III wrote:
> Yes, well regarding the details of picking the right aspect after
> cropping...if you get latest mplayer CVS, you can just use -lavcopts
> autoaspect and forget about having to do any computations. :))
> But you still need to make sure you're fully cropping the black
> borders and any artifacts around the edges of the picture, or encoding
> quality will severely suffer. Stuff like this is hard to automate.

That'll certainly be nice to have it automatically computed. Maybe I 
should use HEAD instead of 0.90. It is more difficult to automate 
cropping. The human has provide input at least to choose the frame of 
the video. Then, cropdetect does most of the work, though I've had to 
adjust the sensitivity to get what I want. A better cropdetect would 
probably need to detect the rectangular shape or the edge instead of 
just using a trigger level. Come to think of it, it might not be too 
hard to find an existing edge detect method and write a filter. If I 
ever feel motivated to learn MPlayer internals, I'll probably try it.

I certainly understand what you're saying about human intelligence being 
needed to optimize everything. Currently, the encoder seems to be able 
to do a pretty good job of optimizing visual quality in a given sequence 
of frames, given a certain total number of bits. However, the human 
still has to balance frame size and bpp. Video is obviously quite a bit 
more complex than sound, so it will probably be a while before we see 
something like oggenc or lame's quality setting. After all, only a human 
can truly see like a human.

Jonathan Rogers

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