AV Sync errors using v1.17.1 win(x64-release), 4K UHD disc

[Dingo69]

Hi all,

What do all these AV Sync errors mean? I’ve seen a few threads that mention the issue, but am unsure of the resolution. Is this a concern?


MakeMKV v1.17.1 win(x64-release)

Disc: Cars 3 4K UHD
Video: MpegH HEVC Main10@L5.1
Audio: TrueHD Surround 7.1 English
Subtitles: PGS Englih (forced only)

Code: Select all

Saving 1 titles into directory N:/Movies/Cars 3 (2017) 4K
AV synchronization issues were found in file 'N:/Movies/Cars 3 (2017) 4K/Cars 3_t01.mkv' (title #2)
AV sync issue in stream 1 at 0:00:00 with duration of 0.666ms : encountered overlapping frame, audio skew is +0.666ms
DEBUG: Code 4784230 at K+^!y(H;K$sp\yJ3:29404326
DEBUG: Code 91 at K+^!y(H;K$sp\yJ3:121269662
AV sync issue in stream 1 at 0:04:27.766 with duration of 0.847ms : encountered overlapping frame, audio skew is +1.5ms
AV sync issue in stream 1 at 0:04:27.767 with duration of 0.833ms : 1 frame(s) dropped to reduce audio skew to +0.666ms
DEBUG: Code 51 at K+^!y(H;K$sp\yJ3:29404326
DEBUG: Code 21 at K+^!y(H;K$sp\yJ3:121269662
AV sync issue in stream 1 at 0:04:57.254 with duration of 0.819ms : encountered overlapping frame, audio skew is +1.486ms
AV sync issue in stream 1 at 0:04:57.255 with duration of 0.833ms : 1 frame(s) dropped to reduce audio skew to +0.652ms
DEBUG: Code 54 at K+^!y(H;K$sp\yJ3:29404326
DEBUG: Code 31 at K+^!y(H;K$sp\yJ3:121269662
AV sync issue in stream 1 at 0:18:15.342 with duration of 0.83ms : encountered overlapping frame, audio skew is +1.483ms
AV sync issue in stream 1 at 0:24:10.281 with duration of 0.852ms : encountered overlapping frame, audio skew is +2.333ms
AV sync issue in stream 1 at 0:24:10.283 with duration of 0.833ms : 1 frame(s) dropped to reduce audio skew to +1.5ms
DEBUG: Code 6488164 at K+^!y(H;K$sp\yJ3:29404326
DEBUG: Code 64 at K+^!y(H;K$sp\yJ3:121269662
AV sync issue in stream 1 at 0:36:49.664 with duration of 0.833ms : encountered overlapping frame, audio skew is +2.319ms
AV sync issue in stream 1 at 0:36:49.666 with duration of 0.833ms : 1 frame(s) dropped to reduce audio skew to +1.486ms
DEBUG: Code 6684775 at K+^!y(H;K$sp\yJ3:29404326
DEBUG: Code 99 at K+^!y(H;K$sp\yJ3:121269662
AV sync issue in stream 1 at 0:50:35.031 with duration of 0.847ms : encountered overlapping frame, audio skew is +2.333ms
AV sync issue in stream 1 at 0:50:35.033 with duration of 0.833ms : 1 frame(s) dropped to reduce audio skew to +1.5ms
DEBUG: Code 5308506 at K+^!y(H;K$sp\yJ3:29404326
AV sync issue in stream 1 at 1:00:55.817 with duration of 0.85ms : encountered overlapping frame, audio skew is +2.333ms
AV sync issue in stream 1 at 1:00:55.820 with duration of 0.833ms : 1 frame(s) dropped to reduce audio skew to +1.5ms
DEBUG: Code 54 at K+^!y(H;K$sp\yJ3:29404326
DEBUG: Code 49 at K+^!y(H;K$sp\yJ3:121269662
AV sync issue in stream 1 at 1:08:41.491 with duration of 0.833ms : encountered overlapping frame, audio skew is +2.313ms
AV sync issue in stream 1 at 1:08:41.493 with duration of 0.833ms : 1 frame(s) dropped to reduce audio skew to +1.48ms
DEBUG: Code 5046373 at K+^!y(H;K$sp\yJ3:29404326
DEBUG: Code 76 at K+^!y(H;K$sp\yJ3:121269662
AV sync issue in stream 1 at 1:13:37.620 with duration of 0.83ms : encountered overlapping frame, audio skew is +2.313ms
DEBUG: Code 52 at K+^!y(H;K$sp\yJ3:29404326
DEBUG: Code 13 at K+^!y(H;K$sp\yJ3:121269662
AV sync issue in stream 1 at 1:13:58.474 with duration of 0.833ms : encountered overlapping frame, audio skew is +3.147ms
AV sync issue in stream 1 at 1:13:58.477 with duration of 1.666ms : 2 frame(s) dropped to reduce audio skew to +1.48ms
DEBUG: Code 32 at K+^!y(H;K$sp\yJ3:29404326
AV sync issue in stream 1 at 1:16:10.064 with duration of 0.85ms : encountered overlapping frame, audio skew is +2.333ms
AV sync issue in stream 1 at 1:16:10.066 with duration of 0.833ms : 1 frame(s) dropped to reduce audio skew to +1.5ms
DEBUG: Code 2097203 at K+^!y(H;K$sp\yJ3:29404326
DEBUG: Code 43 at K+^!y(H;K$sp\yJ3:121269662
AV sync issue in stream 1 at 1:31:13.007 with duration of 0.827ms : encountered overlapping frame, audio skew is +2.313ms
AV sync issue in stream 2 at 0:00:00 : Forced subtitles track #2 turned out to be empty and was removed from output file
1 titles saved

[dcoke22]

I wrote a post about this a couple years ago now. It is still mostly relevant.

viewtopic.php?f=12&t=22903&p=94894#p94894

The short, short version is, there's nothing to worry about. Those messages are a side effect of something called seamless branching.

[Dingo69]

Thank you, Sir.

[vjunkie]

I wrote a post about this a couple years ago now. It is still mostly relevant.

viewtopic.php?f=12&t=22903&p=94894#p94894

The short, short version is, there's nothing to worry about. Those messages are a side effect of something called seamless branching.

I am a new user to makemkv and searched the thread before posting, and this post is reassuring, thank you!

Side question, I often get like only 3-5 of these a/v sync errors per disc, so to experience these on each disc is normal?

[dcoke22]

Side question, I often get like only 3-5 of these a/v sync errors per disc, so to experience these on each disc is normal?

In my experience, yes. I see them on my rips with some regularity.