Start time incorrect for video stream in AVCHD sample of Panasonic Lumix GH2

[rmk]

It was already mentioned in one of the comments to ticket #2338 but it deserves its own ticket.

When using API or ffprobe to obtain the stream start time for the video stream for the sample for ticket #2338, it is reported to be 63916, however, the first frame in presentation order (and its containing packet have a timestamp of 67515 (which appears to be sensible).

Command lines and output:

ffprobe -select_streams 0 -show_streams gh2_1080i.mts
ffprobe version N-57272-gc9a22d6 Copyright (c) 2007-2013 the FFmpeg developers

built on Oct 20 2013 12:30:23 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
configuration:
libavutil 52. 47.101 / 52. 47.101
libavcodec 55. 37.102 / 55. 37.102
libavformat 55. 19.103 / 55. 19.103
libavdevice 55. 4.100 / 55. 4.100
libavfilter 3. 88.102 / 3. 88.102
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104

Input #0, mpegts, from 'gh2_1080i.mts':

Duration: 00:00:01.00, start: 0.710178, bitrate: 40960 kb/s
Program 1

Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 25.58 fps, 50 tbr, 90k tbn, 50 tbc
Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 192 kb/s
Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090), 1920x1080

[STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=High
codec_type=video
codec_time_base=1/50
codec_tag_string=HDMV
codec_tag=0x564d4448
width=1920
height=1080
has_b_frames=1
sample_aspect_ratio=1:1
display_aspect_ratio=16:9
pix_fmt=yuv420p
level=40
timecode=N/A
id=0x1011
r_frame_rate=50/1
avg_frame_rate=307/12
time_base=1/90000
start_pts=63916
start_time=0.710178
duration_ts=N/A
duration=N/A
bit_rate=N/A
nb_frames=N/A
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=0
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
STREAM

ffprobe -select_streams 0 -show_frames gh2_1080i.mts
ffprobe version N-57272-gc9a22d6 Copyright (c) 2007-2013 the FFmpeg developers

built on Oct 20 2013 12:30:23 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
configuration:
libavutil 52. 47.101 / 52. 47.101
libavcodec 55. 37.102 / 55. 37.102
libavformat 55. 19.103 / 55. 19.103
libavdevice 55. 4.100 / 55. 4.100
libavfilter 3. 88.102 / 3. 88.102
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104

Input #0, mpegts, from 'gh2_1080i.mts':

Duration: 00:00:01.00, start: 0.710178, bitrate: 40960 kb/s
Program 1

Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 25.58 fps, 50 tbr, 90k tbn, 50 tbc
Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 192 kb/s
Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090), 1920x1080

[FRAME]
media_type=video
key_frame=1
pkt_pts=67515
pkt_pts_time=0.750167
pkt_dts=69315
pkt_dts_time=0.770167
pkt_duration=1800
pkt_duration_time=0.020000
pkt_pos=768
pkt_size=83829
width=1920
height=1080
pix_fmt=yuv420p
sample_aspect_ratio=1:1
pict_type=P
coded_picture_number=0
display_picture_number=0
interlaced_frame=1
top_field_first=1
repeat_pict=0
FRAME

[Michael Niedermayer]

ffprobe git master here gives me
start_pts=67515
start_time=0.750167