[FFmpeg-devel] [PATCH 0/2] RFC: TEXT subtitle decoder
joolzg at btinternet.com
Fri May 25 19:04:17 CEST 2012
----- Original Message -----
> From: Philip Langdale <philipl at overt.org>
> To: ffmpeg-devel at ffmpeg.org
> Sent: Friday, 25 May 2012, 17:30
> Subject: Re: [FFmpeg-devel] [PATCH 0/2] RFC: TEXT subtitle decoder
> On 22.05.2012 22:10, Philip Langdale wrote:
>> Based on the discussion over the last few days, here is an initial
>> pass at a TEXT decoder. It's probably not in a condition to go in
>> directly, as we'd probably want to rename srtdec to textdec, and
>> someone's going to want me to modify the SRT demuxer to emit this
>> TEXT format rather than raw SRT packets (which I don't really mind
>> but I'd rather not hold up the decoder on redoing the demuxer)
>> Philip Langdale (2):
>> matroskadec: Write duration into packet for TEXT subtitles.
>> srtdec: Add TEXT subtitle decoding mode.
>> libavcodec/allcodecs.c | 1 +
>> libavcodec/srtdec.c | 25 ++++++++++++++++++++++---
>> libavformat/matroskadec.c | 2 +-
>> 3 files changed, 24 insertions(+), 4 deletions(-)
> Would anybody like to comment?
> My overall goal here is to get MPEG4 Part 17 subtitle support into
> ffmpeg, and particularly, get to a point where you can remux an mkv
> file into an mp4 one and transfer all the important content (hence
> my other patch to fix chapter handling in mp4). Even with a working
> subtitle encoder, we still need to be able to extract the subtitles
> from the source file in the first place, which doesn't work without
> this set of patches.
> I'm aware of all the other discussion around overall subtitle handling
> (and I'll note that we already 'up-convert' to ASS internally, so
> not sure why that's being discussed like a new thing) but pragmatically
> speaking, there's no reason that resolving that wider problem has to hold
> up all work on subtitles.
> When I get a chance, I'm going to push a branch to github with the actual
> Part17 encoder/decoder; what I've got today works fine but it's still
> rough (and no, I won't have style support in the initial cut)
But what about DVB Subtitles which are bitmap based, anybody looking, apart from me, into this?
Also as i posted before i wanted to do a minimal Teletext Decoder, just for subtitles, and this would work with the text based subtitles.
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