Forum: Ruby-Gnome 2 gstreamer query duration

hello all,

  seems i'm missing something querying song duration through gstreamer.
i've seen this post http://www.ruby-forum.com/topic/206849 , and the
proof-of-concept app, as well as duration meters in other players (zik)
which use the same method.  this code however:
##
pipeline = Gst::ElementFactory.make("playbin2")
pipeline.uri= "file://home/jk/ruby/test.mp3"
d = Gst::QueryDuration.new(Gst::Format::Type::TIME)
pipeline.query(d)
gstdur = d.parse[1]/1000000
p "gstdur= #{gstdur}"
##

  returns:
##
"gstdur= -1"
##

  at the moment i'm using the gem 'mp3info' for duration, and querying
the same file with mp3info, like this:
##
audio = "/home/jk/ruby/test.mp3"
Mp3Info.open(audio){|data| @infodur = data.length}
p "infodur= #{@infodur}"
##

  returns:
##
"infodur= 227.5791875"
##

  any ideas what i'm doing wrong in the gstreamer query?

  -jk

2011/3/7 J. K. <ruby-forum-incoming@andreas-s.net>:
> pipeline.query(d)
> the same file with mp3info, like this:
>
> any ideas what i'm doing wrong in the gstreamer query?

I think you have fogotten to call play method on pipeline.
> solutions. http://p.sf.net/sfu/progress-d2d
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--
Vincent Carmona

> I think you have fogotten to call play method on pipeline.

 i had tried that, with the same result....

pipeline = Gst::ElementFactory.make("playbin2")
pipeline.uri= "file:/home/jk/ruby/test.mp3"
pipeline.play

d = Gst::QueryDuration.new(Gst::Format::Type::TIME)
pipeline.query(d)
gstdur = d.parse[1]/1000000

p "gstdur= #{gstdur}"

  returns

"gstdur= -1"

  strange

this also returns the same value of -1

##
pipeline = Gst::ElementFactory.make("playbin2")
pipeline.uri= "file:/home/jk/ruby/test.mp3"
bus = pipeline.bus
  bus.add_watch {|bus, message|
    case message.type
      when Gst::Message::DURATION
        dur = message
        p dur.parse[1]/1000000
    end
    true}
pipeline.play
##

 -j

2011/3/7 J. K. <ruby-forum-incoming@andreas-s.net>:
> audio = "/home/jk/ruby/test.mp3"
> pipeline = Gst::ElementFactory.make("playbin2")
> pipeline.uri= "file://home/jk/ruby/test.mp3"

I think you are missing "/" here. file:///home/jk/ruby/test.mp3
protocole(file)://path(/home/jk/ruby/test.mp3)

> Posted via http://www.ruby-forum.com/.
>
--
Vincent Carmona

Vincent Carmona wrote in post #985992:
> 2011/3/7 J. K. <ruby-forum-incoming@andreas-s.net>:
>> audio = "/home/jk/ruby/test.mp3"
>> pipeline = Gst::ElementFactory.make("playbin2")
>> pipeline.uri= "file://home/jk/ruby/test.mp3"
>
> I think you are missing "/" here. file:///home/jk/ruby/test.mp3
> protocole(file)://path(/home/jk/ruby/test.mp3)
>

 i thought the same, but oddly i get an error with the extra '/', and 
the file doesn't play -

pipeline.uri= "file://home/jk/ruby/test.mp3"

[#<GLib::Error: Resource not found.>, "gstgiosrc.c(313): 
gst_gio_src_get_stream (): 
/GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0/GstGioSrc:source:\nCould 
not open location file:///jk/ruby/test.mp3 for reading: Error opening 
file: No such file or directory"]


 when i remove the first '/', the file is found and plays...

pipeline.uri= "file:/home/jk/ruby/test.mp3"

#> "gstdur= -1"
#> -1

2011/3/7 J. K. <ruby-forum-incoming@andreas-s.net>:
> i thought the same, but oddly i get an error with the extra '/', and
> the file doesn't play -
>
> pipeline.uri= "file://home/jk/ruby/test.mp3"
>
> [#<GLib::Error: Resource not found.>, "gstgiosrc.c(313):
> gst_gio_src_get_stream ():
> /GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0/GstGioSrc:source:\nCould
> not open location file:///jk/ruby/test.mp3 for reading: Error opening
> file: No such file or directory"]
I guess you now miss "home"
file:///home/jk/ruby/test.mp3 and not  file:///jk/ruby/test.mp3
> Posted via http://www.ruby-forum.com/.
>
--
Vincent Carmona

this:

audio = "/home/jk/ruby/test.mp3"

pipeline = Gst::ElementFactory.make("playbin2")
pipeline.uri= GLib.filename_to_uri(audio)

 plays just fine, but my duration problem is not solved...  i still 
return

"gstdur= -1"
-1

  any ideas?

2011/3/7 J. K. <ruby-forum-incoming@andreas-s.net>:
> "gstdur= -1"
> -1
>
> any ideas?
>
Maybe you need some gstreamer plugins. Did you try other files, other 
formats?

> ruby-gnome2-devel-en@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/ruby-...
>



--
Vincent Carmona

Vincent Carmona wrote in post #986024:
>>
> Maybe you need some gstreamer plugins. Did you try other files, other
> formats?
>

  tried a different .mp3, .flac, .ogg, and .wav - all play fine, but 
give me the same
"-1" duration.

  the plugins i have are the following:
*gstreamer0.10-*
ffmpeg
pitfdll
tools
fluendo-plugins-mp3-partner v.7.0.20100316
esd
nice
gnonlin
pulseaudio
alsa
plugins-base
packagekit
plugins-good
x
plugins-bad
plugins-base-apps
plugins-bad-multiverse
plugins-ugly
plugins-ugly-multiverse
plugins-good-dbg
plugins-base-dbg
plugins-bad-multiverse-dbg
plugins-ugly-multivers-dbg
libgstreamer-plugins-base0.10(and -dev)
gir1.0-gst-plugins-base-0.10
libgstreamer0.10-0(and -dev)

hey all,

  SOLVED

  interesting, it turns out that there is a lag in the duration query 
(at least with 1.8.7, gtk2 0.19.3 and gstreamer 0.10.x.)  when i put the 
query in the timeout loop for showing position, it would first show -1 a 
couple of times, and then show the duration parsed to seconds after a 
bit.  i ended up solving my problem writing a simple getDuration method, 
which includes an 1/8 of a second sleep, to let the pipeline get rolling 
before the query takes place.

def getDuration
  sleep 0.125
  qd = Gst::QueryDuration.new(Gst::Format::Type::TIME)
  @pipeline.query(qd)
  @dur = qd.parse[1]/1000000000
end

  not the prettiest thing in the world, but works like a charm.


  -jk

2011/3/19 J. K. <ruby-forum-incoming@andreas-s.net>:
> before the query takes place.
>
> _______________________________________________
> ruby-gnome2-devel-en mailing list
> ruby-gnome2-devel-en@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/ruby-...
>

Instead of sleep I would have use GLib::Timeout.add method. It should
allows  other events to be processed during the 0.125 s.

def getDuration
GLib::Timeout.add(125){
qd = Gst::QueryDuration.new(Gst::Format::Type::TIME)
@pipeline.query(qd)
@dur = qd.parse[1]/1000000000
if @dur<0
 true#TODO : add a limit for the number of queries
else
 false
end
}

--
Vincent Carmona

hi vincent -

  nice solution - didn't like the sleep much myself, i'll give this a 
shot.

  thanks,

  -j