Forum: Ruby-Gnome 2 gstreamer: parse tag and number of track of cd

Hi.

I want to retrieve informations from tags.
I watch the bus attached to a pipeline for Gst::Message::TAG. I do not
know how to parse the tag. Is there some documentations somewhere?

I want to retrieve the number of tracks and tracks length from
/dev/cdrom file. Is there a Gst way?

Vincent

Hi Vincent,

I have exact the same problem! It's really badly documented. Did you 
find a solution?

Leon

Hi Leon.

I do not have found a solution using GStreamer. :(

To parse tag, I think it should exist an parse method for 
Gst::MessageTag class. There was one in the old implementation 
(https://trac.luon.net/ruby-gstreamer0.10/browser/trunk/ruby-gstreamer0.10/sample/video-player.rb). 
It seems that there is a function in C (gst_message_parse_tag if I 
remenber what I am be told on gstreamer irc channel).
I have open a feature request: 
https://sourceforge.net/tracker/?func=detail&aid=2922270&group_id=53614&atid=470972 
Hope that someone will have time to implement it and to explain how to 
use it.

To retrieve infos from cd, I have no idea on how to do it.

Vincent

Hi Vincent,

Thanks! Yeah, I was missing the parse method too. I really find the ruby 
gstreamer library very bugy and incomplete :(

I think I'll just use exiftool then or maybe a commandline script made 
in python :)

I don't think a lot of people are working on ruby-gst. I thank the ones 
that are.
I use ruby-taglib (http://www.hakubi.us/ruby-taglib/) to read tags but 
maybe you want to take a look at rtaglib 
(http://rtaglib.rubyforge.org/).

Oh thanks. I'll have a go with taglib then!

Hi Leon.

I upload a patch to the tracker to parse Gst::Message::TAG.
https://sourceforge.net/tracker/?func=detail&aid=2924886&group_id=53614&atid=470971

Not sure it is well written but it seems functional. It add a parse 
method to a Gst::Message::TAG object. A hash is returned.