[vlc] HDTV - aspect ratio problem

[Marian Durkovic]

Hi all,


   during recent experiments with HDTV we've found a problem regarding
aspect ratio.

   HDTV format 1920 x 1080 is broadcasted with an aspect ratio 16:9. 
As 1920/1080 is equal to 16/9, the pixels should have exactly square 
form.

   However, due to MPEG requirement for number of lines being a multiple
of 32, the actual transport stream for HDTV stations is coded as
1920 x 1088, with the last 8 lines containing black pixels or garbage.

   When VLC sees the picture 1920 x 1088 with declared aspect ratio 16:9, 
it tries to recompute it to fit into the declared aspect ratio, and thus
ends up with 1934 x 1088 display size, loosing the pixel squareness and
image quality.

   Isn't it possible to fix this problem within VLC, by detecting the
HDTV 1920 x 1088 format and automatically cropping it to 1920 x 1080
_before_ aspect ratio image recalculations take place?



	Thanks & kind regards,


		M.
 

--------------------------------------------------------------------------
----                                                                  ----
----   Marian Durkovic                       network  manager         ----
----                                                                  ----
----   Slovak Technical University           Tel: +421 2 524 51 301   ----
----   Computer Centre, Nam. Slobody 17      Fax: +421 2 524 94 351   ----
----   812 43 Bratislava, Slovak Republic    E-mail/sip: md at bts.sk    ----
----                                                                  ----
--------------------------------------------------------------------------

-- 
This is the vlc mailing-list, see http://www.videolan.org/vlc/
To unsubscribe, please read http://www.videolan.org/support/lists.html