OK I've just found another more significant problem. which is surely linked:
when I play the clip in a sequence - the clip gets drastically out of sync from where it should be: so if I play a 25 second clip the playhead will get to the end of it, but it will only be playing what is actually halfway through. hhmm. Also when I step forward the same glitching can be found - ie the frame order is jumbled even when advancing frame at a time. (the clips play back in VLC just fine)
Maybe this is to do with the fact that the fps footage is being seen by premiere as 25fps (in the media bin frame rate). I tried interpreting the footage as 50fps and it does the same thing.
when I play clip with audio the audio sounds right. Its not as simple as the video being half the speed though - after 50 seconds the the video is about 5 seconds behind.
importing clip from ssd makes no difference
It never glitches the same way twice on a clip.
it exports WITHOUT the glitches (but the sync is all out - sounds plays normal speed picture in slowmo)
avchd, mts from gh2, 50fps
i7920 overclocked slightly
crucial m4 128gb ssd boot drive
wd raptor 300 scratch drive
wd caviar black video drive (sequencial read 158MB/s)
Gtx 275 graphics running newest driver (glitch occurred with both this and previous drvier), mercury playback
gt520 drives 3rd display
Other software: outlook, chrome. (makes no difference if they're running or not)
Type Name Format Binary Version ICM Microsoft RLE MRLE msrle32.dll 6.1.7601.17514 ICM Microsoft Video 1 MSVC msvidc32.dll 6.1.7601.17514 ICM Microsoft YUV UYVY msyuv.dll 6.1.7601.17514 ICM Intel IYUV codec IYUV iyuv_32.dll 6.1.7601.17514 ICM Logitech Video (I420) i420 lvcodec2.dll 13.31.1044.0 ICM Toshiba YUV Codec Y411 tsbyuv.dll 6.1.7601.17514 ICM Cinepak Codec by Radius cvid iccvid.dll 126.96.36.199 ICM ASUS ASV2 CODEC ASV2 asusasv2.dll 188.8.131.52 ICM Helix YV12 YUV Codec YV12 yv12vfw.dll 184.108.40.206 DMO Mpeg4s Decoder DMO mp4s, MP4S, m4s2, M4S2, MP4V, mp4v, XVID, xvid, DIVX, DX50 mp4sdecd.dll 6.1.7600.16385 DMO WMV Screen decoder DMO MSS1, MSS2 wmvsdecd.dll 6.1.7601.17514 DMO WMVideo Decoder DMO WMV1, WMV2, WMV3, WMVA, WVC1, WMVP, WVP2 wmvdecod.dll 6.1.7601.17514 DMO Mpeg43 Decoder DMO mp43, MP43 mp43decd.dll 6.1.7600.16385 DMO Mpeg4 Decoder DMO MPG4, mpg4, mp42, MP42 mpg4decd.dll 6.1.7600.16385
This is is the media analysis by super (mediainfo)
Reports 25fps, VLC reports 50fps. I can tell by the slow mo that it is 50fps, though.
ID : 0 Complete name : D:\QLD holiday\GH2\2\00012.MTS Format : BDAV Format/Info : Blu-ray Video File size : 47.8 MiB Duration : 22s 916ms Overall bit rate : 17.5 Mbps Maximum Overall bit rate : 18.0 Mbps
ID : 4113 (0x1011) Menu ID : 1 (0x1) Format : AVC Format/Info : Advanced Video Codec Format profile : High@L4.0 Format settings, CABAC : No Format settings, ReFrames : 2 frames Duration : 23s 20ms Bit rate mode : Variable Bit rate : 16.6 Mbps Maximum bit rate : 16.3 Mbps Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate : 25.000 fps Resolution : 8 bits Colorimetry : 4:2:0 Scan type : Progressive Bits/(Pixel*Frame) : 0.720 Stream size : 45.5 MiB (95%)