[haiku] Re: GSoC: Writing native interfaces for ported applications
- From: David McPaul <dlmcpaul@xxxxxxxxx>
- To: haiku@xxxxxxxxxxxxx
- Date: Wed, 14 Apr 2010 23:33:11 +1000
On 14 April 2010 23:13, Axel Dörfler <axeld@xxxxxxxxxxxxxxxx> wrote:
> On 04/14/2010 02:30 PM, David McPaul wrote:
> [...]
>> The VideoMixer will not care how the bitmaps are produced, it will
>> just merge streams together and output at the framerate of the primary
>> stream.
>>
>> I expect the DVD subtitle tracks would be similar and just like
>> MediaPlayer recognises multiple audio tracks and allows selection
>> between them it will need to also handle multiple subtitle tracks and
>> allow selection.
>
> DVD subtitles are actual bitmaps ready to be rendered (ie. there is no
> built-in font in your DVD player).
Ok, I have been reading up on subtitle tracks in Mp4, Avi and Mkv
containers. They are text and may or may not include fonts.
>> Yes text subtitles would be rendered as bitmaps. Bitmap subtitles
>> might actually be tricker as it would be seen as a seperate video
>> track.
>
> I don't see a difference there as long as you always render bitmaps,
> anyway. In both cases I would assume they are published as additional
> video tracks that just need to be marked as subtitles somehow.
That is the main issue then, on a DVD you have multiple video tracks
and multiple audio tracks and need to select the appropriate track to
play. I think subtitle tracks are marked differently (as
subpicture?), if not there will need to be a way to distinguish a
subtitle video stream from a normal video stream.
--
Cheers
David
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