[haiku-bugs] Re: [Haiku] #6826: Add support for styled SSA/ASS subtitle rendering - libass (enhancement)
- From: "herdemir" <trac@xxxxxxxxxxxx>
- Date: Wed, 17 Nov 2010 15:30:37 -0000
#6826: Add support for styled SSA/ASS subtitle rendering - libass (enhancement)
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Reporter: herdemir | Owner: stippi
Type: enhancement | Status: new
Priority: normal | Milestone: R1
Component: Applications/MediaPlayer | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Has a Patch: 0
Platform: All | Blocking:
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Comment (by herdemir):
Sorry for writing a long comment, just for information.
Well, sorry for not being clear in using "styled" word. To clarify
"styled" subtitle it would be better to explain what SSA/ASS subtitles
features are.
SSA/ASS is alot more advanced then basic subtitles(SRT) files. They
provide multiple styles with style management support, like using
different fonts/colors/size/shadow anywhere and anytime. They also provide
advanced display features like text positioning, karaoke, etc. For more
info:
- http://en.wikipedia.org/wiki/SubStation_Alpha
- http://www.matroska.org/technical/specs/subtitles/ssa.html
If you prefer to see in action than in words, here are same samples which
you can view them with a SSA/ASS supported player like SMPlayer,VLC,any
gstreamer based player with assrender plugin, etc.:
- http://samples.mplayerhq.hu/Matroska/mewmew/mewmew-vorbis-ssa.mkv
- http://samples.mplayerhq.hu/Matroska/matrix/Matrix.Reloaded.Trailer-
640x346-XviD-1.0beta2-HE_AAC_subtitled.mkv
This is where libass comes in play. It provides all the rendering support
you need. Even with a simple SRT to SSA/ASS converter it can render srt
subtitles with advanced style.
As for ffmpeg, it supports basic ASS/SSA subtitles by downgrading to SRT
like basic subtitle(no advanced styling,etc.). Maybe they may incorporate
libass with its changed license, since they don't prefer GPL but a little
less restrictive license like LGPL(or maybe BSD too).
Actually, I wanted to implement it as a filter to MediaKit or MediaPlayer,
like in Windows VSFilter does, but since I'm new to Be API and there is
not much of good documentation about MediaKit/MediaPlayer, I couldn't go
further. Even I don't know if it is possible.
IMO supporting libass in a native filter way would be really good for
Haiku. Any program can use this Media Kit filter if it wants to support
subtitle rendered w.
Just my 2 cents.
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Ticket URL: <http://dev.haiku-os.org/ticket/6826#comment:2>
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