[MPlayer-users] Feature suggestion and/or request

[Alexander Roalter]

Thus far I have managed to catalog all my DVDs with the exact aspect 
ratio using a patched-up version of the cropdetect filter. As it is 
bothersome to patch it anew everytime I fetch an update, I think it 
would be useful to others and fit quite well in

What I did until now was inserting these lines in vf_cropdetect.c (at 
the end of function put_image)

float ratio = ((float)(vf->priv->x2 - vf->priv->x1 + 1))/
               ((float)(vf->priv->y2 - vf->priv->y1 + 1));

float factor = 1.06666666;

printf("ratio = %.2f:1\n", ratio * factor);

At this point, factor can be one of four different ones: for 
non-anamorphic PAL DVDs 1.0666666, for anamorphic PAL DVDs 1.4222222222,
for non-anamorphic NTSC DVDs 0.8888888 and for anamorphic NTSC DVDs it 
should be 1.18611111. Besides providing the factor manually, it could 
also easily calculated from the given resoltion and the given aspect.

suggestion: -vf aspectdetect does the same as cropdetect, but outputs 
only the current aspect ratio.

(Of course there should be measures for movies with only half the width 
and full height, though I have only encountered one such DVD with a 
bonus feature in this resolution)



Another suggestion is the inclusion of a -truespeed or -24fps switch, 
which plays PAL DVDs at 24 frames (as with the -speed 0.96 option) and 
leaves NTSC content untouched. The downpitched sound for PAL when 
playing @ 24fps is also welcome, as most movies are not pitch-corrected 
when converting to PAL, so the correct sound pitch would be given only 
after playing it at 24 frames. And in such rare cases where a pitch 
correction has been made, there's still this audio plugin I seem to have 
forgotten about (never tried to use it.)

cheers,
Alex