subtitles font

[erdem_ua]

It not' related with fonts. They doesn't have the "shadow" but it's view functions. We could use that function for showing subtitles instead of original media player one, some day..

[moras86]

Yesterday I saw DVB-T subtitles first time and they really look better than this from Media Player. I make screenshot:

[erdem_ua]

I think it's relatively easy hack to use DTV subtitle routines instead of media players one. Just change of function adresses might do the job.
Unfortunatelly I am bussy for a while.
Can't dive under IDA.

[tgrassi]

I'll follow this post

[geo650]

I am not sure you can use DVB functions for MediaPlay subtitles. I believe most DVB subtitles are transmitted as bitmaps, not text. DVB standard defines also 'code based' standard but I don't think it is used because of problems with font generators at viewer's side. Like on DVD-Video discs, subtitles are transmitted in small bitmaps.

I'd like to know if I am right, so maybe anybody could check this by recording subtitled stream and look for texts or bitmaps inside TS file ? (if subtitle stream is recorded at all)
It would be great to get DVB subtitles to memory or separate file (if transmitted as text), but this is the something completely different.

[jw1001]

I demultiplexed a DVB-T subtitle stream from a UK BBC channel and could not see any text in the hex viewer, so I guess it must be bitmapped. I have noticed some European DVB-S satellite channels use Videotext for subtitles - that might be different, but I don't have a sample here.

[moras86]

Simple record with subtitles for analyze:
http://www.sendspace.com/file/lel61x

[erdem_ua]

Does it possible/logical to create an application that generates subtitle textures and show it on screen with SDL since we have overlay tools?
Doesn't them work while playing movie from player?

[geo650]

Simple record with subtitles for analyze:
http://www.sendspace.com/file/lel61x

Thanks for this sample.
My investigation:
Conclusion: These subtitles are stored in bitmaps only.

How did I analyze it?
First, I took TS Doctor utility to check what streams we have. Here is the result:



As you can see, there is one subtitle stream. So I filtered this stream to a separate file (ca. 25KB).

Then I demuxed SUB using ProjectX,

Code: Select all

++> Subpicture: PID 0x01FA / PesID 0xBD / SubID 0x20 :
-> selected DVB subpicture color model: (0) 4 colors ; fixed to page id: 
-> Subpicture PTS: first packet 12:16:14.397, last packet 12:16:26.437
-> adjusting subpicture at its own timeline
-> source is DVB Subtitle...
4 subpictures written...

(a piece of output log file)

then used VOBsub utilities to check what is inside. Here are the results - four individual subtitles found:



After extracting subtitle #2 (Save as Scenarist SST/BMP):



There are no visible text-encoded subtitles in that file. It's a pity.
But I hope, we know more about DVB subtitles now.