Comment 1 for bug 1365503

I am able to reproduce this easily on krillin using image 16. However thumbnails are generated correctly in the gallery on mako, so I don't believe the issue is related to the gallery app itself but rather something on the system. Also, I don't think it's a gstreamer related issue, as the thumbail is correctly displayed in the video scope so if it was a gstreamer issue it would fail there as well.

It could be a security/apparmor related issue. I see these DENIALS in /var/log/syslog when launching the gallery when there are video thumbnails:

Sep 4 23:28:54 ubuntu-phablet kernel: [ 8210.366923] (1)[2347:gallery-app]type=1400 audit(1409887734.744:487): apparmor="DENIED" operation="chmod" profile="com.ubuntu.gallery_gallery_2.9.1.1049" name="/run/user/32011/" pid=2347 comm="gallery-app" requested_mask="w" denied_mask="w" fsuid=32011 ouid=32011
Sep 4 23:28:56 ubuntu-phablet kernel: [ 8212.259456] (2)[2612:CodecLooper]type=1400 audit(1409887736.644:488): apparmor="DENIED" operation="open" profile="com.ubuntu.gallery_gallery_2.9.1.1049" name="/android/system/etc/mtk_omx_core.cfg" pid=2612 comm="CodecLooper" requested_mask="r" denied_mask="r" fsuid=32011 ouid=0