Exaile fails/lags on track change

[Jan Bessai]

My Exaile 0.3.0.1on Arch Linux 64Bit fails or lags on track change.

Using Unified:

When double clicking a new Track I get "No URI specified to play from" or "Internal Data Flow Error" most of the time. I cannot click away the warning messages as Exaile hangs. Sometimes I can only stop it with killall -KILL exaile and sometimes it just takes about 30 seconds until playback resumes and warnings can be clicked away.
On console these warning messages appear:

(exaile.py:30720): GStreamer-WARNING **: Element Stream0 is not in bin pipeline0

(exaile.py:30720): GStreamer-WARNING **: Element Stream1 is not in bin pipeline0
INFO : Attempting to find covers for 'Breathe' by 'Pain' from 'Pain'
WARNING : No covers found
Traceback (most recent call last):
  File "/usr/lib/exaile/xl/player/engine_unified.py", line 113, in on_message
    if not self.current['__length']:
TypeError: 'NoneType' object is unsubscriptable
Traceback (most recent call last):
  File "/usr/lib/exaile/xl/player/engine_unified.py", line 113, in on_message
    if not self.current['__length']:
TypeError: 'NoneType' object is unsubscriptable
Traceback (most recent call last):
  File "/usr/lib/exaile/xl/player/engine_unified.py", line 113, in on_message
    if not self.current['__length']:
TypeError: 'NoneType' object is unsubscriptable
Traceback (most recent call last):
  File "/usr/lib/exaile/xl/player/engine_unified.py", line 113, in on_message
    if not self.current['__length']:
TypeError: 'NoneType' object is unsubscriptable
Traceback (most recent call last):
  File "/usr/lib/exaile/xl/player/engine_unified.py", line 113, in on_message
    if not self.current['__length']:
TypeError: 'NoneType' object is unsubscriptable
Traceback (most recent call last):
  File "/usr/lib/exaile/xl/player/engine_unified.py", line 113, in on_message
    if not self.current['__length']:
TypeError: 'NoneType' object is unsubscriptable
ERROR : <gst.Message GstMessageError, gerror=(GstGError)NULL, debug=(string)"gstbasesrc.c\(2378\):\ gst_base_src_loop\ \(\):\ /GstPipeline:pipeline0/GstBin:Stream0/GstURIDecodeBin:uridecodebin56/GstFileSrc:source:\012streaming\ task\ paused\,\ reason\ not-linked\ \(-1\)"; from source at 0x3853440> ['__class__', '__cmp__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__grefcount__', '__gstminiobject_init__', '__gtype__', '__hash__', '__init__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'copy', 'flags', 'parse_async_start', 'parse_buffering', 'parse_buffering_stats', 'parse_clock_lost', 'parse_clock_provide', 'parse_duration', 'parse_error', 'parse_info', 'parse_new_clock', 'parse_request_state', 'parse_segment_done', 'parse_segment_start', 'parse_state_changed', 'parse_step_done', 'parse_step_start', 'parse_stream_status', 'parse_structure_change', 'parse_tag', 'parse_tag_full', 'parse_warning', 'set_buffering_stats', 'set_seqnum', 'src', 'structure', 'timestamp', 'type']

Using "Normal" as playback engine:

Sometimes changing the track (automatically as well as manually) leads to long lags (> 30 seconds). The more often I change tracks, the longer and more probable lags become.
In debug mode I just get
"WARNING : No covers found (xlgui.cover)
DEBUG : Requesting save from timeout... (xl.settings)
DEBUG : Saving settings... (xl.settings)"
on the console.
In contrast to the Unified engine, exaile stays responsitive otherwise.

My system should be fast enough (Intel Core 2 Duo, 1.66 Ghz, 2GB Ram) and CPU load keeps lower than 30% most of the time. All types of fading are disabled and their timeouts are set to zero.

Enabled Plugins:

CD Playback 0.0.1
Lyrics Wiki 0.0.1
Shoutcast Radio 0.0.1

Some info about installed versions:

Exaile:

local/exaile 0.3.0.1-1
    A media player aiming to be similar to KDE's AmaroK, but for GTK+

GStreamer:

local/gstreamer0.10 0.10.24-1
    GStreamer Multimedia Framework
local/gstreamer0.10-bad 0.10.14-1
    GStreamer Multimedia Framework Bad Plugin libraries (gst-plugins-bad)
local/gstreamer0.10-bad-plugins 0.10.14-1
    GStreamer Multimedia Framework Bad Plugins (gst-plugins-bad)
local/gstreamer0.10-base 0.10.24-1
    GStreamer Multimedia Framework Base plugin libraries
local/gstreamer0.10-base-plugins 0.10.24-1 (gstreamer0.10-plugins)
    GStreamer Multimedia Framework Base Plugins (gst-plugins-base)
local/gstreamer0.10-ffmpeg 0.10.8-1 (gstreamer0.10-plugins)
    Gstreamer FFMpeg Plugin
local/gstreamer0.10-good 0.10.16-1
    GStreamer Multimedia Framework Good plugin libraries
local/gstreamer0.10-good-plugins 0.10.16-1 (gstreamer0.10-plugins)
    GStreamer Multimedia Framework Good Plugins (gst-plugins-good)
local/gstreamer0.10-python 0.10.16-1
    Python bindings for GStreamer 0.10
local/gstreamer0.10-ugly 0.10.12-1
    GStreamer Multimedia Framework Ugly plugin libraries
local/gstreamer0.10-ugly-plugins 0.10.12-1 (gstreamer0.10-plugins)

Python:

local/dbus-python 0.83.0-2
    Python bindings for DBUS
local/gnome-python 2.26.1-1
    gnome-python is a set of interfaces to gnome-libs.
local/gnome-python-desktop 2.26.0-1
    Gnome Python interfaces for libraries not part of the core platform
local/gstreamer0.10-python 0.10.16-1
    Python bindings for GStreamer 0.10
local/mutagen 1.16-1
    An audio metadata tag reader and writer implemented in pure python
local/pycairo 1.8.6-1
    Python bindings for the cairo graphics library
local/pygobject 2.18.0-1
    Python bindings for GObject
local/pygtk 2.14.1-4
    Python bindings for the GTK widget set
local/pygtksourceview2 2.6.0-1
    Python bindings for gtksourceview2
local/pyorbit 2.24.0-2
    Python bindings for ORBit2
local/python 2.6.2-5
    A high-level scripting language
local/python-pysqlite 2.5.5-1
    A Python DB-API 2.0 interface for the SQLite embedded relational database
    engine

[Jan Bessai (jan-bessai)]

I forgot to mention:
My audio sink is set to Alsa.

Version information:
local/alsa-lib 1.0.21.a-1
    An alternative implementation of Linux sound support
local/alsa-oss 1.0.17-1
    OSS compatibility library
local/alsa-utils 1.0.21-1
    An alternative implementation of Linux sound support
local/lib32-alsa-lib 1.0.21.a-1 (lib32)
    An alternative implementation of Linux sound support