unity-lens-video could use libgnomedesktop to do thumbnailing

[Michael Blennerhassett]

Nautilus uses libgnomedesktop3 to do its thumbnailing. As there is a python binding (gir1.2-gnomedesktop-3.0), the lens should use that, rather than rolling its own thumbnails.

The attached patch uses multiprocessing.pool to queue all the files that don't already have thumbnails. There is also per 1 second watchdog that will close the pool if it is empty (otherwise the child processes hang around). The multiprocessing bits are in a different file so that all the stuff at the top of unity-lens-video doesn't get re-run when child processes are created.

I've tested the patch a little, and it seems to do the right thing.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: unity-lens-video 0.3.6-0ubuntu2 [modified: usr/lib/unity-lens-video/unity-lens-video]
ProcVersionSignature: Ubuntu 3.5.0-5.5-generic 3.5.0-rc7
Uname: Linux 3.5.0-5-generic x86_64
ApportVersion: 2.4-0ubuntu3
Architecture: amd64
Date: Sat Jul 21 10:24:17 2012
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120606.2)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_AU:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
SourcePackage: unity-lens-video
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "thumb.patch" of this bug report has been identified as being a patch. The ubuntu-reviewers team has been subscribed to the bug report so that they can review the patch. In the event that this is in fact not a patch you can resolve this situation by removing the tag 'patch' from the bug report and editing the attachment so that it is not flagged as a patch. Additionally, if you are member of the ubuntu-reviewers team please also unsubscribe the team from this bug report.

[This is an automated message performed by a Launchpad user owned by Brian Murray. Please contact him regarding any issues with the action taken in this bug report.]

[Michael Blennerhassett (mjblenner)]

This patch is the same thing, but without the extra file. python multiprocessing is a bit better behaved on linux than I expected.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.