Hi Guys,

so posting debug results from Kazam for 1 hour 22 minutes 16 seconds  screencast (playback available only for 30 first minutes):

krzysiek@k-y500:/usr/share/doc/kazam$ kazam --debug --nosound
DEBUG Kazam - Starting ...
DEBUG Kazam - Running on: Ubuntu 15.04
DEBUG Kazam - Kazam version: 1.4.5 NCC-80102
DEBUG Kazam - Starting new instance ...
DEBUG Prefs - XDG_PICTURES is a directory and accessible
DEBUG Prefs-HW - Getting hardware specs
DEBUG Prefs-HW - Getting Video sources.
DEBUG Prefs-HW - Found 1 monitor(s).
DEBUG Prefs-HW -   Monitor 0 - X: 0, Y: 0, W: 1920, H: 1080
DEBUG Main - Gstreamer version detected: 1.4.5.0
DEBUG Main - Setting variables.
DEBUG Main - Connecting indicator signals.
DEBUG Main - Starting in silent mode: False
DEBUG Indicator - Indicatior silent: False
DEBUG Indicator - Trying to bind hotkeys.
DEBUG Main - Main Window UI setup.
/usr/lib/python3/dist-packages/kazam/app.py:145: Warning: value "((GtkIconSize) 32)" of type 'GtkIconSize' is invalid or out of range for property 'icon-size' of type 'GtkIconSize'
  self.builder.add_from_file(os.path.join(prefs.datadir, "ui", "kazam.ui"))
DEBUG Main - Unable to get name for '<Adjustment object at 0x7f5faf5417e0 (GtkAdjustment at 0x1809b80)>'

(kazam:9854): Gtk-WARNING **: Can't set a parent on widget which has a parent


(kazam:9854): Gtk-WARNING **: Can't set a parent on widget which has a parent

DEBUG Main - Capture cursor: True.
DEBUG Main - Capture cursor_pic: True.
DEBUG Main - Capture borders_pic: True.
DEBUG Main - Record clicked, invoking Screencast.
DEBUG GStreamer - Audio_source : None
DEBUG GStreamer - Audio2_source : None
DEBUG GStreamer - Video_source: {'height': 1080, 'x': 0, 'y': 0, 'width': 1920}
DEBUG GStreamer - Xid: None
DEBUG GStreamer - Area: None
DEBUG GStreamer - Capture Cursor: True
DEBUG GStreamer - Framerate : 15.0
DEBUG GStreamer - Coordinates SX: 0 SY: 0 EX: 1919 EY: 1079
DEBUG GStreamer - testing for xid: None
DEBUG GStreamer - Codec: H264 (MP4)
DEBUG GStreamer - Filesink: /home/krzysiek/Videos/kazam_pkpqohut.movie
DEBUG GStreamer - Linking Video
DEBUG GStreamer - Link mux -> file queue: True
DEBUG GStreamer - Link file queue -> sink: True
DEBUG Main - Hiding main window.
DEBUG Main - Counter finished.
DEBUG Indicator - Recording started.
DEBUG GStreamer - Setting STATE_PLAYING
DEBUG Indicator - Recording stopped.
DEBUG Main - Stop request.
DEBUG GStreamer - Sending new EOS event
DEBUG Main - Recorded tmp file: /home/krzysiek/Videos/kazam_pkpqohut.movie
DEBUG Main - Waiting for data to flush.
DEBUG GStreamer - Received EOS, setting pipeline to NULL.
DEBUG GStreamer - Emitting flush-done.
DEBUG Main - Done Recording initialized.
DEBUG Main - Done recording signals connected.
DEBUG Done Recording - Continue - Save (2).
DEBUG Save Dialog - Save dialog called with path: None
DEBUG Save Dialog - Previous path invalid, setting it to: /home/krzysiek/Videos
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
DEBUG Main - Save Done, result: /home/krzysiek/Videos
DEBUG Main - Quit requested.
INFO Main - Unable to delete one of the temporary files. Check your temporary directory.
DEBUG Kazam - Finishing ...


This is not too much for me, there is no info about lack of capacity (memory/process power) to encode in fly or anything else except those 3 interesting entries:
DEBUG GStreamer - Sending new EOS event
DEBUG GStreamer - Received EOS, setting pipeline to NULL.
INFO Main - Unable to delete one of the temporary files. Check your temporary directory.

My computer specs ( based on command:> kazam$ sudo lshw -html > ~/hardware_info.html ) in attachment. I will try next screencast with unstable version.