[gst-devel] Problems to rip CD using cdparanoiasrc

[Tim-Philipp Müller]

On Fri, 2010-01-22 at 21:27 +0100, Pascal Ognibene wrote:

Hi,

> I'm trying to rip a CD using a simple gstreamer pipeline (..)
> In the code below, I basically use the EOS event to seek to the next
> cd track.
> But the behavior I see is weird:
> -the first track is ripped ok
> -I call the start_track_rip function for track 2
> -the program blocks here forever.
> 
> I must be doing something really wrong but I can't see what, even by
> the looking at the sources of sound juicer for example. 
> Any help is welcome, 

Not related to your problem at all, but you might want to add a queue
after cdparanoiasrc to make sure encoding continues if there are
problems reading the CD (dirt on the disc etc.).

I haven't actually run your code, but it looks to me like you get an EOS
and then change the track number via the property and that's it.
However, when you get the EOS, streaming has already stopped,
cdparanoiasrc is not running any longer. At that point, setting the
property will not make it start up again.

You have two options here:

a) set pipeline state back to READY (or NULL), then change to PLAYING
again.

b) issue a seek in "track" format (track number might be 0-based in this
case, don't remember exactly) to make it start up again.

(b) might work in this particular case where you're just writing mp3
data to a file, but (a) is likely to work better in general, esp. with
other encoders, if you add muxers or if you add a tag writer.

So in short, try changing

  gst_element_set_state(sink, GST_STATE_NULL);

at the beginning of start_track_rip() to

  gst_element_set_state(pipeline, GST_STATE_NULL);

Cheers
 -Tim