[mythtv-commits] Ticket #6748: BluRay Subtitle Support

[MythTV]

#6748: BluRay Subtitle Support
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 Reporter:  Stephen <stev391 at email.com>  |       Owner:  ijr    
     Type:  patch                        |      Status:  new    
 Priority:  minor                        |   Milestone:  unknown
Component:  MythTV - Video Playback      |     Version:  unknown
 Severity:  medium                       |     Mlocked:  0      
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 The attached patch should perform nearly everything bar the actual
 displaying of the subtitle, this is were I need your help. MythTV appears
 to be processing the returned bitmap, dimensions, timing etc, and states
 that it has set a subtitle to visible, but it doesn't appear on my
 screen!?

 Also after looking at the code, it appears that MythTV scales the subtitle
 so it fits on a 720p screen, why is this? My BluRay's are all 1080p and
 scaling the image down then back up again will result in ugly looking
 images.

 Attached to this email you can find my progress to date. The patch
 performs the following:

 * Modifies mpegts.c to identify the subtitle streams (so now you can
 select the subtitle when playing)

 * Implements a basic parser for the subtitle packet

 * Decodes the packet and produces a bitmap

 Known limitations at the moment:

 * Run Length Encoded subtitles over multiple packets is not supported (I
 know how to fix this)

 * Cropping of the decoded bitmap (again I know how to fix this, but I
 haven seen a subtitle with
 this yet)

 * Differentiating forced subtitles from normal ones (so you can tell it to
 only show forced subtitle, any ideas on how to implement this [i know
 where the flag is in the data])

 To enable debugging, uncomment the defines near the top of each file. If
 you enable the option to save image for each subtitle, you can see that
 the code is correctly decoding the data and producing a bitmap.

 Eventually the FFmpeg sections will be submitted upstream, however as I do
 not have a full working subtitle support to test with I will hold off for
 the moment.

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Ticket URL: <http://svn.mythtv.org/trac/ticket/6748>
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