Eac3to - A remaining delay could not be fixed? [Archive]

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heliocentric

15th September 2010, 00:19

A remaining delay of +1ms could not be fixed.

what does this fault mean? is it a problem?

i get it in a log file when i use the eac3to part of bdclown to demux a bluray file ready to make it into a mkv.

thanks

tebasuna51

15th September 2010, 01:39

Without recode we can only delete/insert complete ac3 frames. Each 48 KHz ac3 frame have a duration of 32 ms, then we can obtain until +- 16 ms of error in the delay.
But, don't worry 16 ms is less than the duration of a video frame then isn't perceptible.

heliocentric

15th September 2010, 09:33

So this isn't a problem and I don't need to do anything?

It's a dts hd track, should i be re-encoding with eac3to to avoid any audio sync issues or can i leave it as it is?

Thanks

p.s.

heres the log file-

M2TS, 1 video track, 6 audio tracks, 23 subtitle tracks, 1:47:27, 24p /1.001
1: Chapters, 20 chapters
2: h264/AVC, 1080p24 /1.001 (16:9)
3: DTS Master Audio, English, 5.1 channels, 24 bits, 48kHz, -9ms
(core: DTS, 5.1 channels, 24 bits, 1509kbps, 48kHz)
4: AC3, English, 5.1 channels, 384kbps, 48kHz, dialnorm: -27dB, -23ms
5: DTS, German, 5.1 channels, 24 bits, 768kbps, 48kHz, -9ms
6: DTS, Spanish, 5.1 channels, 24 bits, 768kbps, 48kHz, -9ms
7: AC3, English, 2.0 channels, 224kbps, 48kHz, dialnorm: -27dB, -23ms
8: AC3, English, 2.0 channels, 224kbps, 48kHz, dialnorm: -27dB, -23ms
9: Subtitle (PGS), English
10: Subtitle (PGS), German
11: Subtitle (PGS), German
12: Subtitle (PGS), Spanish
13: Subtitle (PGS), Spanish
14: Subtitle (PGS), Danish
15: Subtitle (PGS), Finnish
16: Subtitle (PGS), Norwegian
17: Subtitle (PGS), Swedish
18: Subtitle (PGS), English
19: Subtitle (PGS), German
20: Subtitle (PGS), Spanish
21: Subtitle (PGS), Danish
22: Subtitle (PGS), Finnish
23: Subtitle (PGS), Norwegian
24: Subtitle (PGS), Swedish
25: Subtitle (PGS), English
26: Subtitle (PGS), German
27: Subtitle (PGS), Spanish
28: Subtitle (PGS), Danish
29: Subtitle (PGS), Finnish
30: Subtitle (PGS), Norwegian
31: Subtitle (PGS), Swedish
Creating file "Z:\Desktop\Chapters_1.txt"...
[v02] Extracting video track number 2...
[a03] Extracting audio track number 3...
[a03] Applying DTS delay...
[s09] Extracting subtitle track number 9...
[a03] A remaining delay of +1ms could not be fixed.
[s18] Extracting subtitle track number 18...
[s25] Extracting subtitle track number 25...
[v02] Creating file "Z:\Desktop\Video_2.h264"...
[a03] Creating file "Z:\Desktop\Audio_3_English.DTS"...
[s25] Creating file "Z:\Desktop\Subtitles_25_English.sup"...
[s18] Creating file "Z:\Desktop\Subtitles_18_English.sup"...
[s09] Creating file "Z:\Desktop\Subtitles_9_English.sup"...
Video track 2 contains 154583 frames.
Subtitle track 9 contains 1012 captions.
Subtitle track 18 contains 1982 captions.
Subtitle track 25 contains 1789 captions.
eac3to processing took 28 minutes, 1 second.
Done.

tebasuna51

15th September 2010, 09:56

You don't need to do anything.

heliocentric

15th September 2010, 10:16

What does it then when it says that then? Just so I know :)

Thanks

heliocentric

15th September 2010, 17:14

i found this thread on the problem...

should i follow the advice given here when muxing into an mkv? http://forum.doom9.org/showthread.php?t=154290

it says you can add a value into mkvmerge to to balance out the delay? or to avoid any delay should i just transcode the dolby hd/dts to ac3 every time

marcio

15th September 2010, 18:16

Don't use eac3to to extract / merge mkv files. Better yet, use eac3to ONLY to encode / decode audio files.
Use TSMUXER (link below) to extract mkv / blu-ray files.
Use MKVTOOLNIX with MKVMERGE GUI (link below) to create mkv files.

http://www.smlabs.net/tsmuxer_en.html
http://www.bunkus.org/videotools/mkvtoolnix/

This are the official / best tools to extract / merge mkv / blu-ray. Other tools for those jobs sucks.

Problem solved.

bigotti5

15th September 2010, 18:32

Use TSMUXER (link below) to extract mkv
tsMuxer is not able to detect audio delays in mkv files - so dont use it for mkv.

heliocentric

15th September 2010, 19:00

im not using eac3to to make mkvs...

im using mkvmerge for that :)

at the moment im using

1. anydvd hd to decode the bluray and rip it.
2.bd clown to output the audio, video, chapter and subs.
3.feeding all those into using mkvmerge to make a mkv.

i thought that was a pretty good work flow...

just need clarification on my original questions really :)

bigotti5

15th September 2010, 19:10

You should not transcode to ac3.
To make it to a hair's breadth insert delay value given by eac3to in Mkvmerge (Format specific options - Delay)

heliocentric

15th September 2010, 19:19

You should not transcode to ac3.
To make it to a hair's breadth insert delay value given by eac3to in Mkvmerge (Format specific options - Delay)

and then that value is written to the resulting mkv and will be in sync? just checking because i may later want to reencode the resulting mkv to watch on my ipod...

Inspector.Gadget

15th September 2010, 19:25

This are the official / best tools to extract / merge mkv / blu-ray. Other tools for those jobs sucks.

This is a wholly unsupportable assertion and everyone should disregard it.

Blue_MiSfit

19th September 2010, 18:15

Yes, please do not claim that any specific tool is official / best. Read up on the forum rules if this sounds strange to you.

My two cents on the OP's question: it's a non issue. When there are small remaining audio delays (as I understand), it's because the audio and video are just slightly offset due to differing durations etc.. As tebasuna51 pointed out, there is no way you'd ever notice this. I'd say most folks would be hard pressed to detect even a 50ms audio delay, which is less than two frames.

Consider also that during playback clock jitter etc will cause sync to constantly drift a bit - probably a lot more than 1ms ;)

Long story short - relax! :D

Derek

Thunderbolt8

19th September 2010, 20:18