I get an Exception but the conversion worked.

[gulfpearl]

I get the following error:

<FFMpegConvertError error="[libx264 @ 0x1fcb7c0] kb/s:4683.39", pid=30866, cmd="/usr/bin/ffmpeg -i /opt/test/media/2015/07/19/99756898-1509-48ba-84db-5b70ff2fd8d2 -acodec aac -ac 2 -ar 48000 -strict experimental -vcodec libx264 -r 30 -s 1920x1080 -aspect 1920:1080 -sn -f mp4 -y /opt/test/media/2015/07/19/99756898-1509-48ba-84db-5b70ff2fd8d2.mp4">

Even though the conversion works fine, I don't get any errors when I run it from the command line either.

[gulfpearl]

Also, my ffmpeg version and platform:
ffmpeg version 2.5.7-0ubuntu0.15.04.1