Imported Mp4 Video/Audio out of sync

PistolHill wrote on 4/9/2020, 3:09 PM

When I import an mp4 file to Vegas pro 17, The sound an audio are not in sync. When before the import, it was just fine.

Im a musician, recording video and audio seperate. To do my job I need to line the quality microphone audio up with the audio the camera picked up. So its crucial that the Camera Audio lines up with the video when imported. Ive tried all of the fixes that ive been able to find, Including the So4 fix and it did not work. Hoping someone can help as lining up audio is the main reason I purchased this program.

 

I am on Windows 10

Comments

Musicvid wrote on 4/9/2020, 9:58 PM

https://www.vegascreativesoftware.info/us/forum/faq-how-to-post-mediainfo-and-vegas-pro-file-properties--104561/

rraud wrote on 4/10/2020, 10:04 AM

Can we assume the (quality) audio was recorded on a second system? Even when recorded at the same time, does not guarantee drift free sync w/o timecode and a wordclock.
In addition many AAC encoders shift the sound a frame or so (plus or minus). Always work with PCM audio.

Silverglove wrote on 4/15/2020, 11:28 PM

I'm very confused by this as well. Vegas has always been my editor of choice, but I had to give up a number of years ago as the workflow was not allowing me to work without being hindered. I continued to use Vegas for all of my audio needs and simple video production. I'm working on new network and streaming shows so I thought I'd give Vegas 17 a try again. Some of the included footage was sourced as .mp4. Problem 1, V17 doesn't support .mp4 so here we go again installing QT. OK, that works. Now I import the .mp4's and all audio is off. A lot. I go back to one of my many Mac's and just open the file.... in sync (not the band). I go back to Vegas and line the audio up manually. (mind you this is a 5 hour finished cut). Everything is edited all audio is lined up and synced (in my project) and I proceed to export in 2 pieces. Export goes extremely well (.mp4 format). I open the finished files, voila... audio is off. Super disappointed. i9, 2080TI, 32gb ram, SSD, Windows 10. Any real solutions to be compatible with the rest of the world?

rraud wrote on 4/16/2020, 10:31 AM

@Silverglove: "V17 doesn't support .mp4"
- in VP-17, QT file types must be enabled in "Depreciated features"


"I open the finished files, voila... audio is off."
- By how much?

Silverglove wrote on 4/16/2020, 1:04 PM

@Silverglove: "V17 doesn't support .mp4"
- in VP-17, QT file types must be enabled in "Depreciated features"

 

Thanks for jumping in. Already have that enabled.

alexen wrote on 6/15/2020, 6:54 AM

Hey…I think your MP4 video file must be corrupted. And I know that abrupt audio sync, missing sound or audio lag in the video can ruin your experience. It is absolutely unacceptable and so, why don't you try the VLC Media Player by setting the audio sync to fix audio video sync in MP4 problems. The other manual methods worth trying once are reinstalling drivers & performing the system reset on your system.

michael-harrison wrote on 6/15/2020, 7:52 AM

Basically what @Musicvid suggested. Get mediainfo on the problem clip.

At a guess, I'd say that you've got a vfr clip, which VP hates.

System 1:

Windows 10
i9-10850K 10 Core
128.0G RAM
Nvidia RTX 3060 Studio driver [most likely latest]
Resolution        3840 x 2160 x 60 hertz
Video Memory 12G GDDR5

 

System 2:

Lenovo Yoga 720
Core i7-7700 2.8Ghz quad core, 8 logical
16G ram
Intel HD 630 gpu 1G vram
Nvidia GTX 1050 gpu 2G vram

 

hughdemand wrote on 6/27/2020, 7:08 AM

Hey…I think your MP4 video file must be corrupted. And I know that abrupt audio sync, missing sound or audio lag in the video can ruin your experience. It is absolutely unacceptable and so, why don't you try the VLC Media Player by setting the audio sync to fix audio video sync in MP4 problems. The other manual methods worth trying once are reinstalling drivers & performing the system reset on your system.

After I determine the acceptable number, 30ms, can I save the MP4 video while in VLC?

Dexcon wrote on 6/27/2020, 7:17 AM

@hughdemand  ... just a hint. You've made your comment a 'quotation' by using quotation marks which are usually used to highlight a point raised by someone in an earlier post. Thus in reading your comment, I looked for an earlier comment which you were quoting which, of course, is not the case.

Perhaps you might like to revisit your comment and remove the quotation marks so others on the forum will know that you are making a contribution.

Cameras: Sony FDR-AX100E; GoPro Hero 11 Black Creator Edition

Installed: Vegas Pro 15, 16, 17, 18, 19, 20, 21 & 22, HitFilm Pro 2021.3, DaVinci Resolve Studio 19.0.3, BCC 2025, Mocha Pro 2025.0, NBFX TotalFX 7, Neat NR, DVD Architect 6.0, MAGIX Travel Maps, Sound Forge Pro 16, SpectraLayers Pro 11, iZotope RX11 Advanced and many other iZ plugins, Vegasaur 4.0

Windows 11

Dell Alienware Aurora 11:

10th Gen Intel i9 10900KF - 10 cores (20 threads) - 3.7 to 5.3 GHz

NVIDIA GeForce RTX 2080 SUPER 8GB GDDR6 - liquid cooled

64GB RAM - Dual Channel HyperX FURY DDR4 XMP at 3200MHz

C drive: 2TB Samsung 990 PCIe 4.0 NVMe M.2 PCIe SSD

D: drive: 4TB Samsung 870 SATA SSD (used for media for editing current projects)

E: drive: 2TB Samsung 870 SATA SSD

F: drive: 6TB WD 7200 rpm Black HDD 3.5"

Dell Ultrasharp 32" 4K Color Calibrated Monitor

 

LAPTOP:

Dell Inspiron 5310 EVO 13.3"

i5-11320H CPU

C Drive: 1TB Corsair Gen4 NVMe M.2 2230 SSD (upgraded from the original 500 GB SSD)

Monitor is 2560 x 1600 @ 60 Hz

hughdemand wrote on 6/27/2020, 10:13 AM

I have , on occasion, encountered AV sync issues with an imported MP4 file.

After I ungroup  the two tracks, is there an easy (simple) way to slide the audio track a predetermined number of milliseconds ? Trying to avoid expanding the track view so I can see the actual distance I have moved the audio track..

 

Hoping I have explained what I am after here. Thanks.

Oh yes, this is Vegas Pro 15

rraud wrote on 6/27/2020, 1:47 PM

To drag the audio event at the millisecond (or down to the sample) level, disable 'Quantize to frame', snapping to markers, seconds or snapping to whatever (aside from zero crossings). Zooming in on the timeline will increase the resolution for dragging events. Zoomed in to the max will show the sample points.. typically 48,000 per second.
If he audio drifts (probable w/o genlock), hold Ctrl. key and drag the end of the new audio event to line up with the reference audio track end (assuming of course the heads have been sync'd already.