[FFmpeg-trac] #4344(undetermined:new): XSUBs are too low in PAL video, on PS3

[FFmpeg]

#4344: XSUBs are too low in PAL video, on PS3
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             Reporter:  edumj        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  xsub         |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by edumj):

 I've tested, and it seems that DivXMux does this:
 1-Crop every bitmap (like SubRip).
 2-Pad them to 640x480 (bottom center aligned).

 VLC captures with a yellow drawbox to see subtitles full size:

 DVD Subtitles extracted to IDX/SUB are 720x576:
 [[Image(http://i47.photobucket.com/albums/f169/edumj/IDX-
 SUB%20720x576.png)]]

 IDX/SUB Subtitles converted to XSUB with DivXMux are 640x480:
 [[Image(http://i47.photobucket.com/albums/f169/edumj/IDX-
 SUB%20to%20DivXMux%20640x480.png)]]

 You can see original upper subs go down with DivXMux because of the
 cropping an padding. They look not well bottom-centered in VLC, but ok in
 TV.

 I don't know if ffmpeg can do this automatic cropping and padding to
 640x480, but at least it could scale them down to 720x480 or better
 640x480.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4344#comment:19>
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