[Bug 780117] Re: Brasero finishes without error but unusable media [on-the-fly mode] (Ubuntu 11.04 ->12.04)

[Ayan George]

** Description changed:

+ SRU Justification
+ ~~~~~~~~~~~~~~~~~
+ 
+ Impact:
+ 
+   Currently Brasero will fail to write files to a disc in on-the-fly
+   mode using the libburnia plugin resulting in 'coastered' media.
+   This is the default mode of operation and unless the user is writing
+   a pre-built ISO image, this fails 100% of the time and has since Oneiric
+   -- possibly Natty.
+ 
+ Fix:
+ 
+   Revert part of the following commit:
+ 
+ http://git.gnome.org/browse/brasero/commit/?id=1b8397ee252df2d554682ca2d694d5937fbf6e39
+ 
+   Particularly the chage to plugins/libburnia/burn-libisofs.c around line
+   200 that adds an additional priv->libburn_src->read_xt() call.
+ 
+ Patch:
+ 
+ http://git.gnome.org/browse/brasero/commit/?id=253031b69c5dcbcf079c445ec530afb7ccd9ea82
+ 
+ Test Case:
+ 
+   * Insert blank CD or DVD in drive:
+ 
+     (1) Attempt to write files to the writable optical disc by dragging
+     files from Nautilus to a blank disc.
+ 
+     (2) Click on the 'Write Files to Disc' button in nautilus.
+ 
+     (3) Make sure 'on the fly' mode is enabled by selecting 'Burn image
+     directly without saving to disc' (which should be the default).
+ 
+     (4) Click on the 'burn' button.
+ 
+   * If the bug is fixed, you should have a properly written and readable
+   disc.  Otherwise, the procedure will fail and the disc will be unusable.
+ 
+ ----------
+ 
  Binary package hint: brasero
  
  When I burn a DVD (4,7 and 8,5 GB) Brasero show the progressbar till
  about 30-40% (exact point is randomly) and than says, that it is
  finalizing the media. This finalizing messages is showing for the rest
  of the burning process (~10min @8x 8,5GB). After that, it ejects the
  media without any error. But when I insert the media again, nothing
  happens, except, that the DVD-Drive disappears from the "computer:///"
  location in nautilus.
  
  This problem only exists when burning On-The-Fly. Burning ISO Images or
  automatic creation of ISO Images before burning works without problems.
  The burning speed doesn't matter to this problem. I test 8x, 4x and 2x.
  All the same problem. On-The-Fly burning using K3B works quite well @8x
  speed.
  
  One thing I also notice is, that Brasero uses 100% CPU on one core,
  while K3B uses just about 5-15%.
  
  I attached the last Brasero log. I don't know, why it just says, that it
  was only at 49% and then says it's finished. The burning took about 28
  minutes. The media was unusable on all my three devices (Linux/Windows).
  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: brasero 2.32.1-0ubuntu2
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  NonfreeKernelModules: fglrx
  Architecture: amd64
  Date: Mon May  9 22:10:24 2011
  ExecutablePath: /usr/bin/brasero
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  ProcEnviron:
-  LANGUAGE=de_DE:en
-  LANG=de_DE.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=de_DE:en
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
  SourcePackage: brasero
  UpgradeStatus: No upgrade log present (probably fresh install)
  XsessionErrors:
-  (brasero:2453): GLib-CRITICAL **: the GVariant format string `(u)' has a type of `(u)' but the given value has a type of `()'
-  (brasero:2453): GLib-CRITICAL **: g_variant_get: assertion `valid_format_string (format_string, TRUE, value)' failed
-  (<unknown>:4557): GStreamer-CRITICAL **: gst_debug_add_log_function: assertion `func != NULL' failed
+  (brasero:2453): GLib-CRITICAL **: the GVariant format string `(u)' has a type of `(u)' but the given value has a type of `()'
+  (brasero:2453): GLib-CRITICAL **: g_variant_get: assertion `valid_format_string (format_string, TRUE, value)' failed
+  (<unknown>:4557): GStreamer-CRITICAL **: gst_debug_add_log_function: assertion `func != NULL' failed

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https://bugs.launchpad.net/bugs/780117

Title:
  Brasero finishes without error but unusable media [on-the-fly mode]
  (Ubuntu 11.04 ->12.04)

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