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Hi guys ,

A strange behavior since my update to 13.1 :

Sometimes fps go down to 15 or 16 fps in some movie, it s a very strange bug never happened in 12.3 or 13.0
The problem happens only at the beginning of a movie.
Must relaunch xbmc to play movie without problem
here my log when I start xbmc : (xbmcbuntu 13.0 update to 13.1 with ppa)
01:09:37 T:140061214803904 NOTICE: special://profile/ is mapped to: special://masterprofile/
01:09:37 T:140061214803904 NOTICE: -----------------------------------------------------------------------
01:09:37 T:140061214803904 NOTICE: Starting XBMC (13.1 Git:f2acae7). Platform: x86 Linux 64-bit
01:09:37 T:140061214803904 NOTICE: Using Release XBMC x64 build, compiled Jun 6 2014 by GCC 4.8.2 for x86 Linux 64-bit 3.13.11
01:09:37 T:140061214803904 NOTICE: Running on Linux 64-bit (Ubuntu 14.04 LTS, 3.13.0-29-generic x86_64)
01:09:37 T:140061214803904 NOTICE: Host CPU: Intel® Core™2 Quad CPU Q9550 @ 2.83GHz, 4 cores available

My video card : Nvidia GT 620 and 4 Gb RAM
Doesn't know if help but here a log when I try to play a movie (fps is about 15-16 fps with many stutter until I reboot XBMC :

01:07:16 T:140038277314496 NOTICE: DVDPlayer: Opening: smb://PC/Video HD/My Movie HD.mkv
01:07:16 T:140038277314496 WARNING: CDVDMessageQueue(player):ut MSGQ_NOT_INITIALIZED
01:07:16 T:140035789678336 NOTICE: Thread DVDPlayer start, auto delete: false
01:07:16 T:140035789678336 NOTICE: Creating InputStream
01:07:16 T:140035789678336 NOTICE: Creating Demuxer
01:07:16 T:140035789678336 NOTICE: Opening video stream: 0 source: 256
01:07:16 T:140035789678336 NOTICE: Creating video codec with codec id: 28
01:07:16 T:140035789678336 NOTICE: CDVDVideoCodecFFmpeg::Open() Using codec: H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
01:07:16 T:140035789678336 NOTICE: Creating video thread
01:07:16 T:140035898717952 NOTICE: Thread VideoReferenceClock start, auto delete: false
01:07:16 T:140035881932544 NOTICE: Thread DVDPlayerVideo start, auto delete: false
01:07:16 T:140035881932544 NOTICE: running thread: video_thread
01:07:16 T:140035789678336 NOTICE: Opening audio stream: 1 source: 256
01:07:16 T:140035789678336 NOTICE: Finding audio codec for: 86019
01:07:16 T:140035789678336 NOTICE: Creating audio thread
01:07:16 T:140035798071040 NOTICE: Thread DVDPlayerAudio start, auto delete: false
01:07:16 T:140035798071040 NOTICE: running thread: CDVDPlayerAudio:rocess()
01:07:16 T:140035789678336 NOTICE: Opening Subtitle stream: 3 source: 256
01:07:16 T:140035798071040 NOTICE: Creating audio stream (codec id: 86019, channels: 2, sample rate: 48000, pass-through)
01:07:16 T:140035881932544 ERROR: VAAPI - unable to initialize display -1 - unknown libva error
01:07:16 T:140035881932544 NOTICE: CDVDVideoCodecFFmpeg::GetFormat - Creating VDPAU(1920x800)
01:07:16 T:140035881932544 NOTICE: VDPAU::CreateContext - creating decoder context
01:07:16 T:140035881932544 NOTICE: vdp_device = 0x00000001 vdp_st = 0x00000000
01:07:16 T:140035881932544 NOTICE: VDPAU Decoder capabilities:
01:07:16 T:140035881932544 NOTICE: name level macbs width height
01:07:16 T:140035881932544 NOTICE: ------------------------------------
01:07:16 T:140035881932544 NOTICE: MPEG1 0 8192 2048 2048
01:07:16 T:140035881932544 NOTICE: MPEG2_SIMPLE 3 8192 2048 2048
01:07:16 T:140035881932544 NOTICE: MPEG2_MAIN 3 8192 2048 2048
01:07:16 T:140035881932544 NOTICE: H264_MAIN 41 8192 2048 2048
01:07:16 T:140035881932544 NOTICE: H264_HIGH 41 8192 2048 2048
01:07:16 T:140035881932544 NOTICE: VC1_SIMPLE 1 8190 2048 2048
01:07:16 T:140035881932544 NOTICE: VC1_MAIN 2 8190 2048 2048
01:07:16 T:140035881932544 NOTICE: VC1_ADVANCED 4 8190 2048 2048
01:07:16 T:140035881932544 NOTICE: MPEG4_PART2_ASP 5 8192 2048 2048
01:07:16 T:140035881932544 NOTICE: ------------------------------------
01:07:16 T:140035881932544 NOTICE: Mixer feature: VDP_VIDEO_MIXER_FEATURE_NOISE_REDUCTION
01:07:16 T:140035881932544 NOTICE: Mixer feature: VDP_VIDEO_MIXER_FEATURE_SHARPNESS
01:07:16 T:140035881932544 NOTICE: Mixer feature: VDP_VIDEO_MIXER_FEATURE_DEINTERLACE_TEMPORAL
01:07:16 T:140035881932544 NOTICE: Mixer feature: VDP_VIDEO_MIXER_FEATURE_DEINTERLACE_TEMPORAL_SPATIAL
01:07:16 T:140035881932544 NOTICE: Mixer feature: VDP_VIDEO_MIXER_FEATURE_INVERSE_TELECINE
01:07:16 T:140035881932544 NOTICE: Mixer feature: VDP_VIDEO_MIXER_FEATURE_HIGH_QUALITY_SCALING_L1
01:07:16 T:140035881932544 ERROR: VAAPI - unable to initialize display -1 - unknown libva error
01:07:16 T:140035881932544 NOTICE: CDVDVideoCodecFFmpeg::GetFormat - Creating VDPAU(1920x800)
01:07:16 T:140035881932544 NOTICE: (VDPAU) Close
01:07:16 T:140035881932544 NOTICE: (VDPAU) screenWidth:1920 vidWidth:1920 surfaceWidth:1920
01:07:16 T:140035881932544 NOTICE: (VDPAU) screenHeight:800 vidHeight:800 surfaceHeight:800
01:07:16 T:140035772892928 NOTICE: Thread Vdpau Output start, auto delete: false
01:07:16 T:140035772892928 NOTICE: COutput::OnStartup: Output Thread created
01:07:16 T:140035772892928 NOTICE: VDPAU::COutput::CreateGlxContext - created context
01:07:16 T:140035772892928 NOTICE: VDPAU::COutput: vdpau gl interop initialized
01:07:16 T:140035747714816 NOTICE: Thread Vdpau Mixer start, auto delete: false
01:07:16 T:140035747714816 NOTICE: CMixer::OnStartup: Output Thread created
01:07:16 T:140035747714816 NOTICE: (VDPAU) Creating the video mixer
01:07:16 T:140035772892928 NOTICE: VDPAU::COutput::InitBufferPool - Output Surface created
01:07:16 T:140035772892928 NOTICE: Previous line repeats 6 times.
01:07:16 T:140035772892928 NOTICE: VDPAU::COutput registered output surfaces
01:07:16 T:140035881932544 NOTICE: fps: 23.976024, pwidth: 1920, pheight: 800, dwidth: 1920, dheight: 800

My memory on my HTPC :
Free :
total used free shared buffers cached
Mem: 4047596 3657924 389672 176 16052 3189068
-/+ buffers/cache: 452804 3594792
Swap: 4192252 22356 4169896

Thks for your help