[shotwell] Use nice 19 for video thumbnailer

[Jens Georg <jensgeorg src gnome org>]

commit b138c780f4f9412685e455d678516f5e5f292d43
Author: Jens Georg <mail jensge org>
Date:   Mon Apr 17 08:04:42 2017 +0200

    Use nice 19 for video thumbnailer
    
    Signed-off-by: Jens Georg <mail jensge org>

 thumbnailer.am                              |    3 ++-
 thumbnailer/shotwell-video-thumbnailer.vala |    6 +++++-
 2 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/thumbnailer.am b/thumbnailer.am
index 04362e0..6b835be 100644
--- a/thumbnailer.am
+++ b/thumbnailer.am
@@ -4,7 +4,8 @@ thumbnailer_shotwell_video_thumbnailer_SOURCES = thumbnailer/shotwell-video-thum
 thumbnailer_shotwell_video_thumbnailer_VALAFLAGS = $(COMMON_VALAFLAGS) \
        --pkg gstreamer-1.0 \
        --pkg gee-0.8 \
-       --pkg gtk+-3.0
+       --pkg gtk+-3.0 \
+       --pkg posix
 
 thumbnailer_shotwell_video_thumbnailer_CFLAGS = $(THUMBNAILER_CFLAGS)
 thumbnailer_shotwell_video_thumbnailer_LDADD = $(THUMBNAILER_LIBS)
diff --git a/thumbnailer/shotwell-video-thumbnailer.vala b/thumbnailer/shotwell-video-thumbnailer.vala
index 36a8203..2b381a6 100644
--- a/thumbnailer/shotwell-video-thumbnailer.vala
+++ b/thumbnailer/shotwell-video-thumbnailer.vala
@@ -19,7 +19,11 @@ class ShotwellThumbnailer {
         uint8[]? pngdata;
         int64 duration, position;
         Gst.StateChangeReturn ret;
-        
+
+        if (Posix.nice (19) < 0) {
+            debug ("Failed to reduce thumbnailer nice level. Continuing anyway");
+        }
+
         Gst.init(ref args);
 
         var registry = Gst.Registry.@get ();