As stated earlier in this thread I tried to concatenate AVCHD clips from my Sony Cam using eac3to and its gap/overlapping feature.
But concatenating clips results in increasing negative audio delay.
First demux log from eac3to:
Quote:
M2TS, 1 video track, 1 audio track, 1 subtitle track, 0:17:06
1: h264/AVC, 1440x1080 50i (16:9)
2: AC3, 5.1 channels, 448kbps, 48khz
3: Subtitle (PGS)
[v01] Extracting video track number 1...
[a02] Extracting audio track number 2...
[v01] Creating file "D:\MKV\video.h264"...
[a02] Creating file "D:\MKV\audio.ac3"...
[a02] Audio overlaps for 36ms at playtime 0:00:45.
[a02] Audio overlaps for 28ms at playtime 0:01:44.
[a02] Audio overlaps for 36ms at playtime 0:01:56.
[a02] Audio overlaps for 36ms at playtime 0:02:59.
[a02] Audio overlaps for 28ms at playtime 0:03:11.
[a02] Audio overlaps for 44ms at playtime 0:03:30.
[a02] Audio overlaps for 20ms at playtime 0:03:47.
[a02] Audio overlaps for 44ms at playtime 0:04:08.
[a02] Audio overlaps for 44ms at playtime 0:05:13.
[a02] Audio overlaps for 44ms at playtime 0:07:37.
[a02] Audio overlaps for 44ms at playtime 0:08:38.
[a02] Audio overlaps for 44ms at playtime 0:09:29.
[a02] Audio overlaps for 20ms at playtime 0:10:35.
[a02] Audio overlaps for 44ms at playtime 0:11:51.
[a02] Audio overlaps for 28ms at playtime 0:13:07.
[a02] Audio overlaps for 28ms at playtime 0:13:42.
[a02] Audio overlaps for 28ms at playtime 0:14:19.
[a02] Audio overlaps for 36ms at playtime 0:15:30.
[a02] Audio overlaps for 44ms at playtime 0:15:52.
[a02] The audio file was demuxed without making use of the gap/overlap information.
[a02] Please rerun the same eac3to command line. That will correct the gaps/overlaps.
Video track 1 contains 51348 frames.
eac3to processing took 58 seconds.
Done.
|
I just analyzed my clips and found a 20 ms difference to eac3to
Start Delay in all clips is 1:040
Clip1
last Video PTS: 45:720
correct Start Delay: 44:680
Duration (adding duration of last video frame): 44:720
last Audio PTS: 45:744
correct Start Delay: 44:704
Duration (adding duration of last audio frame): 44:736
16 ms
Clip2
last Video 1.00:800 = 59:760 = 59:800
last Audio 1.00:816 = 59:776 = 59:808
8 ms
Clip3
last Video 12:440 = 11:400 = 11:440
last Audio 12:464 = 11:424 = 11:456
16 ms
Clip4
last Video 1.04:440 = 1.03:400 = 1.03:440
last Audio 1.04:464 = 1.03:424 = 1.03:456
16 ms
....
....
So I assume these differences results in increasing delay.