ogg dev - Jun 2006 - Re: Souffleur subtittle editor (SoC). Need Help with GStreamer

Hi, All!!!

I am at last added some GStreamer support to the Souffleur, and I am
already read this manuals:
 - http://pygstdocs.berlios.de/
 -
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/index.html
But it's steel hard for me to understand (or maybe I something missed)
how it work. :(

For example: I don't know where to search info on how to load additional
info on streams (LANGAGE, AUTHOR...). Or how to load streams data
(Subtitle text). Or how to select some streams in multi streams file
(one video, and one audio) to play...

Please help me with docs.


Maxim.

On 6/20/06, Daraku <otaky@ukr.net> wrote:
> Hi, All!!!
>
> I am at last added some GStreamer support to the Souffleur, and I am
> already read this manuals:
>  - http://pygstdocs.berlios.de/
>  -
>
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/index.html
> But it's steel hard for me to understand (or maybe I something missed)
> how it work. :(
Hi Maxim,

GStreamer's pretty complex, and though the low-level documentation is
pretty complete, it's often quite difficult to understand how to
accomplish some of the higher-level tasks, at least at first. So don't
get too depressed at finding it hard to understand!
>
> For example: I don't know where to search info on how to load
additional
> info on streams (LANGAGE, AUTHOR...). Or how to load streams data
> (Subtitle text). Or how to select some streams in multi streams file
> (one video, and one audio) to play...
I'm not sure how far you've got so far with this stuff. Most of the
information-about-streams stuff comes from "tag messages". You should
be listening to tag messages on your pipeline bus, and you will get
any information about various tags that gstreamer knows. This might
include Author, language info, etc. - of course, if that information
isn't present, gstreamer can't give it to you.

Subtitle information will come on a seperate pad, for playback you
would composite it on to the video. It'll generally have a caps type
of "text/something" for some value of 'something' depending on
the
subtitle format in use.

Selecting particular streams depends on what you're doing precisely -
if you're using decodebin, you can just select which ones to use as
they appear, responding to the pad-added signal. If you're using
playbin (which I don't think you will be?), it can do this internally
for you.

I've CCed Edward Hervey - if you have problems specific to gst-python
(rather than general problems understanding how to use gstreamer),
he'll probably be able to help. However, we're also here to help you -
both on the xiph lists, and in the #gstreamer channel if you want to
join us on irc.

Mike

On Tue, Jun 20, 2006 at 10:04:58PM +0300, Daraku wrote:
>
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/index.html
> But it's steel hard for me to understand (or maybe I something missed)
> how it work. :(
How's this coming? Was Mike's response helpful?

I'm going on vacation for the next couple of days, and all the gstreamer 
people are occupied with Guadec, so if you're stuck it might be worth 
hacking around the issue by just using an external subtitle file you 
read and write yourself. Now that you're done with exams it would be 
nice to get a working mock-up before the google evaluations are due at 
the end of June. You can rework it to use gstreamer properly later.

That just leaves getting playback and scrubbing working. You might look 
at Andy Wingo's theora clip trimmer for an example of that:

  http://webcvs.freedesktop.org//gstreamer/gst-python/examples/remuxer.py
 
There's also thoggen, but I don't think that's been ported to
gstreamer
0.10, which is definitely what you should be using.

  http://thoggen.net/svn/

Hope that helps, and looking forward to seeing souffleur play video!

 -r

Hi Andy,

Hope you're recovering from guadec. Quick remuxer.py question. Daraku 
(Maxim) borrowed the GstPlayer class for the Souffleur subtitle editor 
he's working on for Google SoC, but your source file doesn't have a 
copyright or license header. Is it ok to use it under the GPL? If you're 
not the original author, who should we credit?

Cheers,
 -r

Hi All!

Sorry for silence, I have some troubles with access to the Internet :(.

Status of project:
- Video playback by GStreamer (play by frame support will be soon)
- Manual SRT support (GStreamer support will be soon)
- Subs sink with video

Not much, I think :(

P.S. Now, when I am, at last, have stable access to the Internet,  I am
will be forced to fill the hole in the project schedule, that appear in
last 10 days.

Maxim.