there seem to be some artifacts on the screen during the decode. Sample is here, the issue is a grey bar at the bottom on the video, this is not present during a SW decode or on VDPAU.
General
Unique ID : 244043958016963078675602115081842977901 (0xB799281A28E0E372B164F0B2E393EC6D)
Complete name : grey_bar.mkv
Format : Matroska
Format version : Version 2
File size : 20.0 MiB
Duration : 2h 10mn
Overall bit rate : 21.5 Kbps
Movie name : Fast
Encoded date : UTC 2013-07-03 22:00:05
Writing application : mkvmerge v5.3.0 ('I could have danced') built on Feb 9 2012 10:38:07
Writing library : libebml v1.2.3 + libmatroska v1.3.0
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3.1
Format settings, CABAC : No
Format settings, ReFrames : 2 frames
Muxing mode : Header stripping
Codec ID : V_MPEG4/ISO/AVC
Duration : 2h 10mn
Width : 1 280 pixels
Height : 542 pixels
Display aspect ratio : 2.35:1
Frame rate mode : Constant
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Title : Fast
Language : English
Default : Yes
Forced : No
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : A_AAC
Duration : 2h 10mn
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Title : AAC 2.0 @ 160 kbps
Language : English
Default : No
Forced : No