Fix MPEG2 Audio Sync Issues

[ENunn]

I just transferred an old D-VHS tape and I'm editing it right now with AVS+. Found out that there's some audio sync issues after demuxing the video with DGIndex.

There were some dropouts on the tape, I know that's one of the causes of all these audio problems I'm having. There's nothing I can really do about that, I don't think.

If I import the audio with DirectShowSource its completely out of sync at the start but towards the end it's fine. If I use FFAudioSource it tells me "no audio track found".

FFMPegSource2 is completely out of sync as well, either that or it crashes MPC-HC when I try to scrub through the preview.

I tried muxing the original video with TSMuxer, but when I demuxed it with DGIndex it gives me some "unusually large audio delay" error and I can't open it in anything (that being Audacity and AVS through DShowsource/ffaudiosource). TSDoctor and HDTVtoMPEG2 doesn't fix the issue either.

I also tried ProjectX. Everything's all in sync, however, it's tossing away random parts of the video that play perfectly fine in the original video, so its cutting off dialouge mid sentence. If I change enable one of the PreSettings "Audio: limit points of PTS for sync", the same thing happens. Enabling "Audio: use only first PTS for sync" makes it out of sync.

Does anyone now how I can get my video completely in sync? I can send a 100MB sample if anyone needs it.

General
ID                                       : 1002 (0x3EA)
Complete name                            : F:\vlc\nascar sony hdtv 500 2005.ts
Format                                   : MPEG-TS
File size                                : 6.03 GiB
Duration                                 : 2 h 55 min
Overall bit rate mode                    : Variable
Overall bit rate                         : 4 925 kb/s

Video
ID                                       : 17 (0x11)
Menu ID                                  : 1 (0x1)
Format                                   : MPEG Video
Format version                           : Version 2
Format profile                           : Main@Main
Format settings                          : CustomMatrix / BVOP
Format settings, BVOP                    : Yes
Format settings, Matrix                  : Custom
Format settings, GOP                     : M=3, N=15
Format settings, picture structure       : Frame
Codec ID                                 : 2
Duration                                 : 2 h 55 min
Bit rate mode                            : Variable
Bit rate                                 : 4 423 kb/s
Maximum bit rate                         : 15.0 Mb/s
Width                                    : 704 pixels
Height                                   : 480 pixels
Display aspect ratio                     : 4:3
Frame rate                               : 29.970 (30000/1001) FPS
Standard                                 : Component
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Interlaced
Scan order                               : Top Field First
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 0.437
Time code of first frame                 : 06:27:15;15
Time code source                         : Group of pictures header
GOP, Open/Closed                         : Open
Stream size                              : 5.42 GiB (90%)

Audio
ID                                       : 20 (0x14)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 55 min
Bit rate mode                            : Constant
Bit rate                                 : 256 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Compression mode                         : Lossy
Delay relative to video                  : -245 ms
Stream size                              : 321 MiB (5%)
Service kind                             : Complete Main

Text
ID                                       : 17 (0x11)-CC1
Menu ID                                  : 1 (0x1)
Format                                   : EIA-608
Muxing mode                              : A/53 / DTVCC Transport
Muxing mode, more info                   : Muxed in Video #1
Duration                                 : 2 h 55 min
Bit rate mode                            : Constant
Stream size                              : 0.00 Byte (0%)
CaptionServiceName                       : CC1

[poisondeathray]

Is the original in sync in a media player, such as mpchc, vlc, mpv... ?

[ENunn]

Is the original in sync in a media player, such as mpchc, vlc, mpv... ?

Yep.

[poisondeathray]

What about LSmash ?

Last resort DirectShowSource() for both video and audio. If you have temporal filtering, it might help to encode that first to a lossless intemediate

DirectShowSource("F:\vlc\nascar sony hdtv 500 2005.ts")

[ENunn]

What about LSmash ?

"The number of tracks equals 0."

Last resort DirectShowSource() for both video and audio. If you have temporal filtering, it might help to encode that first to a lossless intemediate

DirectShowSource("F:\vlc\nascar sony hdtv 500 2005.ts")

Frame rate shows up as 29fps and not 29.97 fps which makes deinterlacing impossible. I have fps=(30000/1001) but it's still 59fps.

[poisondeathray]

DirectShowSource("F:\vlc\nascar sony hdtv 500 2005.ts", fps=29.97, audio=true)
AssumeFPS(30000,1001, sync_audio=true)

Preview in MPCHC for sync

[ENunn]

DirectShowSource("F:\vlc\nascar sony hdtv 500 2005.ts", fps=29.97, audio=true)
AssumeFPS(30000,1001, sync_audio=true)

Preview in MPCHC for sync

It's playing at half speed.

Even if it was I still can't deinterlace. It's thinking it's already 59.94p which it isn't.

[poisondeathray]

Can you reproduce the sync issue on the 100MB sample ? If so , post it

[ENunn]

Can you reproduce the sync issue on the 100MB sample ? If so , post it

Not with the original file no. With Avisynth I can through mpeg2source/dshow. Should I just use that?

[poisondeathray]

An original sample is useful if you can reproduce the sync issue. Processing it through avisynth or some other manipulations introduces other issues. eg. Maybe you have an issue with your filters or install ? For example, your directshow filters might be setup so it assumes the framerate is incorrect. It might be working correctly on some other setup or someone else's computer

But it might help to post an original sample anyways, or maybe you need to stream copy a longer or better sample that exhibits the issue

[ENunn]

An original sample is useful if you can reproduce the sync issue. Processing it through avisynth or some other manipulations introduces other issues. eg. Maybe you have an issue with your filters or install ? For example, your directshow filters might be setup so it assumes the framerate is incorrect. It might be working correctly on some other setup or someone else's computer

But it might help to post an original sample anyways, or maybe you need to stream copy a longer or better sample that exhibits the issue

I don't know how I can fix the dshow part.

I don't even think I can reproduce the issue without transcoding or uploading the entire transfer somewhere.

[ProWo]

whats about ffmpeg.exe -i "F:\vlc\nascar sony hdtv 500 2005.ts" -c copy "F:\vlc\nascar sony hdtv 500 2005.mkv"
(if "nascar sony hdtv 500 2005.ts" is your original file, otherwise replace it with the name of the original file).

[ENunn]

whats about ffmpeg.exe -i "F:\vlc\nascar sony hdtv 500 2005.ts" -c copy "F:\vlc\nascar sony hdtv 500 2005.mkv"

Ohhhh yeah that. It's attached. I haven't tested it through AVS yet though.

[poisondeathray]

Everything works ok in that sample in terms of frame rate for directshow using lav filters, avs+ x64. Frame rate is 29.97 (30000/1001) . Not 59.94 like you reported

lsmash works ok too, correct frame rate; not "The number of tracks equals 0."


Maybe you have old plugins or old versions, or bad/old directshow filters installed


As for sync, can't help you on a small sample. Try updating your plugins first

[ENunn]

Everything works ok in that sample in terms of frame rate for directshow using lav filters, avs+ x64. Frame rate is 29.97 (30000/1001) . Not 59.94 like you reported

lsmash works ok too, correct frame rate; not "The number of tracks equals 0."


Maybe you have old plugins or old versions, or bad/old directshow filters installed


As for sync, can't help you on a small sample. Try updating your plugins first

Odd. I don't know what plugins I need to update. I have LAV, I'm running the latest on that but other than that I really don't know what other plugins need updating.

I guess you tried the LSMASHVideoSource. On my end I keep getting a "Failed to read an input file" error.

[poisondeathray]

LSmashVideoSource is only for MP4, MOV, 3gp (ISO base media formats)
LWLibavVideoSource is for everything else

aud=lwlibavaudioSource("nascar sony hdtv 500 2005 sample.ts")
vid=lwlibavvideoSource("nascar sony hdtv 500 2005 sample.ts")
audiodub(vid,aud)

[ENunn]

LSmashVideoSource is only for MP4, MOV

aud=lwlibavaudioSource("nascar sony hdtv 500 2005 sample.ts")
vid=lwlibavvideoSource("nascar sony hdtv 500 2005 sample.ts")
audiodub(vid,aud)

Framerate's fine but it's out of sync.

[Nilzzon]

I ran it through TMPGEnc mpeg smart Renderer, does this help?

[Attachment 54931 - Click to enlarge]

[ENunn]

I ran it through TMPGEnc mpeg smart Renderer, does this help?

[Attachment 54931 - Click to enlarge]

Oh yeah that's in sync and stuff. I probably should've added the section where the tape drops out, but it would've been a while until there would be someone on screen talking and that would make it more than 100mb.

Gonna try this software out on the full file. Is there a way I can output it without transcoding it? I really don't want to lose a lot of quality.

[Nilzzon]

It only reencodes cuts or faulty parts. Smart Render.

[ENunn]

Ah, welp it ALMOST 100% fixed it!!! It's out of sync at the end but it's in sync at the beginning. (through mpeg2source + dshow or ffaudiosource). I need it in sync for the whole vid.

[Nilzzon]

try VideoReDo TVSuite

[ENunn]

try VideoReDo TVSuite

I think it's in sync? Can't tell let me do more tests. Looks promising though.

edit #340985739570439750345: it's all good. the dgindex delay was off. Seems to be all good. Thanks y'all

Wish VideoReDo wasn't a trial, I guess I need this for all my D-VHS transfers :P

[ENunn]

Posting again after a while, I'm trying this again with some other D-VHS rips, but they have a lot of dropouts. So whenever I fix the file with BOTH ffmpeg and VideoReDo, then index with DGIndex, the resulting d2v and ac3 files are out of sync. If I load the .ts file with lwlibavvideosource, everything's in sync but there's a ton of field order changes, so when I deinterlace, it's jumpy. Does anyone know of any solutions to the problem? Recapping the tape has the same problems. I would send a sample, but I don't believe it would show the issues I'm having other than the field order change.