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[Marcello Romani <780117@xxxxxxxxxxxxxxxxxx>]

I can confirm this bug on 11.10 x64. I have just burned a DVD with 613 JPGs onit. Burning options were: write directly on disk (no intermediate image), use burnproof, DVD speed 3x, leave the disk open.
It completed the burning succesfully (apparently), then it started calculating the disk checksum. In the end, a message box said "manually eject the disk". Below it there was another message box reporting an error: it was something like "burning error, some files might be damaged".
It turned out the DVD is totally unreadable.

Man, i HATE regressions like these...

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

Title:
  Brasero finishes without error but unusable media [no simulation mode]
  (Ubuntu 11.04)

Status in A disc burning application for gnome 2:
  New
Status in “brasero” package in Ubuntu:
  Triaged

Bug description:
  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
  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

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