Playback of MPEG4 AVCHD part10 FullHD not smooze (interrupts after 3 seconds) (iphone6 ios8)

I have multiple HD Camcorder recordings (Sony).
Infuse does great job reading/indexing with nice picture, but at playback 2 problems appear:
1.) start of playback takes ~20-30 seconds
2.) infuse plays video only for 2-3 seconds, then video is stuck while audio continues

see code info/ Output from freeware “MediaInfo 0.7.76”
Video
ID : 4113 (0x1011)
Menu ID : 1 (0x1)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Format settings, GOP : M=2, N=13
Codec ID : 27
Duration : 1mn 47s
Bit rate mode : Variable
Bit rate : 21.2 Mbps
Maximum bit rate : 22.0 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Top Field First
Bits/(Pixel*Frame) : 0.410
Stream size : 272 MiB (95%)

if needed i provide a sample video.

For info: same video plays perfectly with other app (called “blackbox”) on my iphone6 ios8
(and playback starts without delay on blackbox…)

regards
Alex