Very solid information that is most likely valuble to any proffesional video creator or if you just want to make a good quality, small file sized video of your DVD on you computer.
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As you can see, the pattern does not repeat until after 4 lines.
So for interlaced video, your y-offset and height for cropping must
be multiples of 4.Native DVD resolution is 720×480 for NTSC, and 720×576 for PAL, but
there is an aspect flag that specifies whether it is full-screen (4:3) or
wide-screen (16:9). Many (if not most) widescreen DVDs are not strictly
16:9, and will be either 1.85:1 or 2.35:1 (cinescope). This means that
there will be black bands in the video that will need to be cropped out.MPlayer provides a crop detection filter that
will determine the crop rectangle (-vf cropdetect).
Run MPlayer with
-vf cropdetect and it will print out the crop
settings to remove the borders.
You should let the movie run long enough that the whole picture
area is used, in order to get accurate crop values.Then, test the values you get with MPlayer,
using the command line which was printed by
cropdetect, and adjust the rectangle as needed.
The rectangle filter can help by allowing you…
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Beautiful Tutorial MPEG-4 Compression
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