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  1. Hi guys.

    I'm desperately trying to sync the audio of this video file...

    Code:
    Format                                   : AVI
    Format/Info                              : Audio Video Interleave
    File size                                : 451 MiB
    Duration                                 : 53 min 52 s
    Overall bit rate                         : 1 170 kb/s
    Writing application                      : Lavf57.25.100
    
    Video
    ID                                       : 0
    Format                                   : MPEG-4 Visual
    Format profile                           : Advanced Simple@L5
    Format settings                          : BVOP2
    Format settings, BVOP                    : 2
    Format settings, QPel                    : No
    Format settings, GMC                     : No warppoints
    Format settings, Matrix                  : Default (H.263)
    Muxing mode                              : Packed bitstream
    Codec ID                                 : XVID
    Codec ID/Hint                            : XviD
    Duration                                 : 53 min 52 s
    Bit rate                                 : 1 029 kb/s
    Width                                    : 720 pixels
    Height                                   : 404 pixels
    Display aspect ratio                     : 16:9
    Frame rate                               : 23.976 (24000/1001) FPS
    Color space                              : YUV
    Chroma subsampling                       : 4:2:0
    Bit depth                                : 8 bits
    Scan type                                : Progressive
    Compression mode                         : Lossy
    Bits/(Pixel*Frame)                       : 0.148
    Stream size                              : 397 MiB (88%)
    Writing library                          : XviD 64
    
    Audio
    ID                                       : 1
    Format                                   : MPEG Audio
    Format version                           : Version 1
    Format profile                           : Layer 3
    Codec ID                                 : 55
    Codec ID/Hint                            : MP3
    Duration                                 : 53 min 52 s
    Bit rate mode                            : Constant
    Bit rate                                 : 128 kb/s
    Channel(s)                               : 2 channels
    Sampling rate                            : 48.0 kHz
    Compression mode                         : Lossy
    Stream size                              : 49.3 MiB (11%)
    Alignment                                : Aligned on interleaves
    Interleave, duration                     : 24  ms (0.58 video frame)
    Interleave, preload duration             : 24  ms
    ... with this video file:

    Code:
    General
    Format                                   : Matroska
    Format version                           : Version 4 / Version 2
    File size                                : 765 MiB
    Duration                                 : 55 min 10 s
    Overall bit rate                         : 1 939 kb/s
    Encoded date                             : UTC 2018-09-09 12:19:09
    Writing application                      : mkvmerge v26.0.0 ('In The Game') 64-bit
    Writing library                          : libebml v1.3.6 + libmatroska v1.4.9
    
    Video
    ID                                       : 1
    Format                                   : HEVC
    Format/Info                              : High Efficiency Video Coding
    Format profile                           : Main@L4@Main
    Codec ID                                 : V_MPEGH/ISO/HEVC
    Duration                                 : 55 min 10 s
    Bit rate                                 : 1 740 kb/s
    Width                                    : 1 920 pixels
    Height                                   : 1 080 pixels
    Display aspect ratio                     : 16:9
    Frame rate mode                          : Constant
    Frame rate                               : 23.976 (24000/1001) FPS
    Color space                              : YUV
    Chroma subsampling                       : 4:2:0
    Bit depth                                : 8 bits
    Bits/(Pixel*Frame)                       : 0.035
    Stream size                              : 687 MiB (90%)
    Default                                  : Yes
    Forced                                   : No
    
    Audio
    ID                                       : 2
    Format                                   : AAC
    Format/Info                              : Advanced Audio Codec
    Format profile                           : HE-AAC / LC
    Format settings                          : Explicit
    Codec ID                                 : A_AAC-2
    Duration                                 : 55 min 9 s
    Bit rate                                 : 197 kb/s
    Channel(s)                               : 6 channels
    Channel positions                        : Front: L C R, Side: L R, LFE
    Sampling rate                            : 48.0 kHz / 24.0 kHz
    Frame rate                               : 23.438 FPS (1024 SPF)
    Compression mode                         : Lossy
    Delay relative to video                  : 23 ms
    Stream size                              : 77.7 MiB (10%)
    Language                                 : English
    Default                                  : Yes
    Forced                                   : No
    
    Text
    ID                                       : 3
    Format                                   : UTF-8
    Codec ID                                 : S_TEXT/UTF8
    Codec ID/Info                            : UTF-8 Plain Text
    Duration                                 : 53 min 29 s
    Bit rate                                 : 92 b/s
    Count of elements                        : 1365
    Stream size                              : 36.2 KiB (0%)
    Language                                 : English
    Default                                  : Yes
    Forced                                   : No
    ... and I can't seem to figure out what's wrong, despite a lot of attempts.

    - The first audio needs to be slowed down to fit the second video, that's for sure.
    - The first video is low-res, and the second one is 1080p.
    - So at first I thought it was a mere 25 -> 23.976 fps problem, but it wasn't. The audio shift is much smaller (progressive shift, the max delay is about 6 seconds towards the end for a 55 min video).
    - So I also tried 24 -> 23.976, but it wasn't either.
    - Some calculations show that the needed duration factor seems to be around 1.002 (the audio should be stretched by that factor), but that factor doesn't match anything that I'm used to. I may be missing something.

    I'm not used to reading Mediainfo details, so I don't know what may be wrong nere.
    Could you please help ? Many thanks in advance !

    PS : please don't mind the total duration of each file, as there are different credits. What matters is that the videos are identical until about 1 min from the end. That's what really matters. That means the audio starts at the same moment (no audio delay at the beginning), and once synced, the audio should remain OK until about 1 min from the end, which would be good enough for me.
    Last edited by Jose Hidalgo; 5th Jun 2020 at 13:45.
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  2. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    If it was just a factor of the audio length, the sync should go out further (either ahead or behind) the further into the
    video you go. Sometimes there is a join at a specific point in the video which throws it out right there.

    You don't really say what results you're getting but if it's in sync for a passage then suddenly goes out, you may need to divide
    it there and work on the pieces separately - then join them together when their done

    An alternative is to post the whole of the video and the new audio let somebody else take a look
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  3. Thanks for your reply. I really think that it IS just a factor of the audio length, but I'd like to understand what's going on.

    I could post the whole audio 1 + video 2 (it's about 800 MB to I could easily give a download link), but would that be allowed?
    It's a TV show episode from 1 or 2 years ago. Audio 1 is a french track, and video 2 is a 1080p english version. I'd like to add the french track to the video 2 for personal purposes.
    Last edited by Jose Hidalgo; 5th Jun 2020 at 14:26.
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  4. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    Originally Posted by Jose Hidalgo View Post
    Thanks for your reply. I really think that it IS just a factor of the audio length, but I'd like to understand what's going on.

    I could post the whole audio 1 + video 2 (it's about 800 MB to I could easily give a download link), but would that be allowed?
    It's a TV show episode from 1 or 2 years ago. Audio 1 is a french track, and video 2 is a 1080p english version. I'd like to add the french track to the video 2 for personal purposes.
    Then I'll have to repeat the process for a dozen other episodes. So ultimately I just need to figure out what the problem is for a single episode.
    This forum doesn't have a problem if you own the media, then you can talk about it openly.
    But if it's a dodgy download, the forum takes a dim view and usually closes the thread.
    This is to protect the forum from any repercussions
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  5. Sure, I understand. Well, let's not risk it then.
    My GF has the media, but I guess it doesn't count since we live miles apart.
    Anyway, thanks for trying to help.

    PS : it's not even the show I'm interested in (I've already seen it in english). It's more about the technical mystery of being unable to sync the audio. I don't know where that unusual factor comes from, and the two Mediainfo don't tell me much.
    Last edited by Jose Hidalgo; 5th Jun 2020 at 14:51.
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  6. Both movies are 23.976 fps, so there is no need to slowing or speeding up anything, but the first has a duration of 53 min 52 s and the second of 55 min 9 s.
    So the first audio is to short for the second video.
    You can search the correct audio delay with VLC player
    Last edited by ProWo; 5th Jun 2020 at 14:57.
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  7. ProWo, like I said in my first post, "please don't mind the total duration of each file, as there are different credits".
    Anyway, I finally found the problem. One of the videos had a 6-second additional title about 3 min into the video.
    Mystery solved!
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  8. Nevermind. You got it already.
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