[vlc-devel] [PATCH 0/3] Bug when converting with both deinterlace checked and codec options

Jérôme Froissart software at froissart.eu
Thu Sep 19 22:44:51 CEST 2019


When converting a video, an MRL is poorly handled.
When the user checks the "deinterlace" statement, convert.cpp inserts this
statement after removing closing braces to the MRL (using "mrl.remove( '}'
This causes issues in case the passed mrl already contains closing braces
(which is the case when the selected profile has custom video codec
A quick-and-dirty fix would be to remove only the latest brace before
inserting the "deinterlace" statement, but, well...that would be

I rather send you a more object-oriented implementation of SoutMrl, that
avoids problems because it better handles "modules" and "options" within
The first and second patches are drop-in replacement for the current
Then the thirs patch actually fixes the bug.

To reproduce the bug:
* open VLC, then "Open capture device" (I am not using the English version,
my description can be slightly wrong)
* Choose whatever source you want, e.g. screen
* Choose "convert"
* Choose a profile, and edit it. In the "video codec" tab, add a custom
argument (e.g. "preset=faster", which makes sense with the x264 codec)
* Start the process. VLC will fail because the MRL will lack a closing
  You can see the MRL in the "messages" dialog.
  Without my patch, the MRL may look like

  whereas my patch correctly handles the closing brace

Sorry, I did not know what to put in the .hpp header, I could have
copied/pasted the GPL license, but I do not know how to properly set the
copyright. Maybe you'll know this better than I do.

These patches can be applied (almost painlessly) to the 3.0.8 branch (there
may only be slight issues with a Makefile.am and a convert.cpp that was
slightly changed)

Jérôme Froissart (3):
  Re-implemented SoutMrl in a more object-oriented way
  Additions to the new SoutMrl implementation
  Deinterlace can be associated with codec arguments

 modules/gui/qt/Makefile.am                    |   1 +
 .../qt/components/sout/profile_selector.cpp   |  80 +++++-----
 .../qt/components/sout/profile_selector.hpp   |   5 +-
 .../gui/qt/components/sout/sout_widgets.cpp   |   1 +
 modules/gui/qt/dialogs/convert.cpp            |  37 +++--
 modules/gui/qt/dialogs/sout.cpp               |   4 +-
 modules/gui/qt/dialogs/sout.hpp               |  71 +--------
 modules/gui/qt/util/soutmrl.cpp               |  86 +++++++++++
 modules/gui/qt/util/soutmrl.hpp               | 145 ++++++++++++++++++
 9 files changed, 301 insertions(+), 129 deletions(-)
 create mode 100644 modules/gui/qt/util/soutmrl.cpp
 create mode 100644 modules/gui/qt/util/soutmrl.hpp

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