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Audio Syncing & Phasing Problem

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Audio Syncing & Phasing Problem

Postby creativeandnoble » Tue Feb 11, 2020 10:13 am

Hi, I'm new to the forum and I didn't know where to post this...

My team and I seem to be having an issue with syncing for our videos...

When the videos are on my mac computer the audio and visuals are in sync, when I upload it to our dropbox and when it's downloaded by our editors it is out of sync... Even though the Frame Rate is constant? Anyone have any idea what the issue might be?

To also give context, I don't think it's related but thought i'd mention.... Some clips seem to have a phasing issue, the original files were fine but after they were colour corrected and rendered out to be handed over to our editors the sound became distorted on certain mobile devices unless the audio is panned to the left or to the right and we have to duplicate the audio file and pan one side left, one side right and invert either one of those sides.


Here is the mediainfo:

Complete name : C:\Users\sammi\Downloads\Aaron Tan Q07.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (mp41/mp42/isom)
File size : 97.2 MiB
Duration : 47 s 155 ms
Overall bit rate : 17.3 Mb/s
Movie name : Aaron Tan Final
Encoded date : UTC 2020-02-05 00:08:03
Tagged date : UTC 2020-02-05 00:08:07

Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings : CABAC / 2 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 2 frames
Format settings, GOP : M=1, N=30
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 47 s 155 ms
Source duration : 48 s 257 ms
Bit rate : 16.7 Mb/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
Scan type : Progressive
Bits/(Pixel*Frame) : 0.336
Stream size : 93.8 MiB (96%)
Source stream size : 95.8 MiB (99%)
Title : Core Media Video
Encoded date : UTC 2020-02-05 00:08:03
Tagged date : UTC 2020-02-05 00:08:07
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Codec configuration box : avcC

Audio
ID : 1
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 47 s 155 ms
Source duration : 47 s 232 ms
Bit rate mode : Constant
Bit rate : 256 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 1.40 MiB (1%)
Source stream size : 1.40 MiB (1%)
Title : Core Media Audio
Language : English
Encoded date : UTC 2020-02-05 00:08:03
Tagged date : UTC 2020-02-05 00:08:07

Thanks so much in advance for your help.
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Re: Audio Syncing & Phasing Problem

Postby Steve Grisetti » Tue Feb 11, 2020 10:46 am

Are you implying DropBox is changing your videos? It definitely is not.

But you're playing your finished videos on your computer and they look fine -- but after you load them to DropBox they're out of sync?

Can you confirm that you're downloading the videos from DropBox and then playing the videos on your computers using a program like VLC Media Player?

You may experience out of sync issues if you stream the videos or play them on the DropBox site. That's because you're only watching a preview of the movies.

To watch your movies, you'll need to download to your computer and play them there.
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Re: Audio Syncing & Phasing Problem

Postby creativeandnoble » Tue Feb 11, 2020 10:55 am

I don't think dropbox is the issue because when i download it back from dropbox to my mac computer the video is still in sync and completely fine... The problem is that both my editors who are remote from Italy and Philippines have the videos out of sync and I'm finding it difficult to figure out why it is out of sync on their computers but not on mine...

It's not just out of sync once imported to prem pro but even when they play back from quicktime or a standard media player

Can' think of a reason why this might be?
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Re: Audio Syncing & Phasing Problem

Postby Steve Grisetti » Tue Feb 11, 2020 12:26 pm

Sorry. I can not. Dropbox does not change the files in any way. Unless they are downloading something other than the original file, this should not happen.

Is it possible they're downloading several files as a batch? This saves all the files as a compressed file that needs to be extracted -- and that may change the files.

But if they are downloading them one at a time, this should not happen.
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Re: Audio Syncing & Phasing Problem

Postby sidd finch » Tue Feb 11, 2020 2:35 pm

Quick question, Are recording in NTSC or PAL? and your camera is recording in NTSC or PAL? And their machines are set to NTSC or PAL.

If you are in NTSC and they are in PAL that might cause some issues.

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Re: Audio Syncing & Phasing Problem

Postby GerryB » Thu Feb 13, 2020 5:35 am

Another test you can try....

Send the files using WeTransfer.com to your editors.
There is a free part to Wetransfer, you can upload unto 2GB and send to 3 people.
You may have to navigate around the home page to find the 'free service' but it is worth the effort.
The files are deleted after 7 day - only downside!!

I use it all the time for very large files where sync has never been an issue.

Gerry
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