Audio Sync Problem

dsscottage

New member
I'm having an audio sync problem and am looking for a place to start looking for the problem. I'm relatively new to VRD.

Generally, I record video from my satellite feed using my Hauppauge HD PVR and ArcSoft TotalMedia Extreme 2. (usually in TS format). Then I edit out the unwanted parts using Video Redo Suite 4.20.7.629. Other times, I'll rip one of my original DVDs and edit out unwanted parts.

Here are most of the settings used:
-capturing from the PVR of a BellTV 9242 satellite receiver
-ArcSoft settings:
- Video input - YPdRr
- Audio input - S/PDIF
- PC Audio Mode - 5.1 ch
- Video Decoder - Video Standard - NTSC_M (This seemed odd. There is no alt for ATSC and I tried other settings but they didn't help.)
- resolution - 1920x1080 30 fps
- 7 Mbps
- TS format (have also tried M2TS)
-VRD Setting:
- Stream Parameters - Detect/resync missing frames - set to - Resync - Remove Audio Frames
(also tried - Resync - Insert Extra Video Frames - didn't help,
also tried - Ignore - didn't help)

The audio on my original recordings are synced well but frequently (but not always) there is a variable level of audio that is not in sync after editing using VRD. I have attempted to adjust the sync using VLC but this hasn't been satisfactory because the audio sync varied within the video file. (i.e. I can sync one part but not the whole video). I believe that the audio sync changes after each edit.


I believe that the issue is caused by Video Redo but am frustrated in attempting to solve it by the randomness of the problem. I've read numerous posts but nothing has led me to a starting point to solve my issue. I've been reluctant to update to the latest version of VRD since many posts speak to an audio sync problem in the latest version.

Can anyone point me in the right direction?
 

glenpinn

Member
Hi, there appears to be other members having various types of A/V sync issues, can be found in these 2 links, 1st link is my own thread.
I dont know what is happening, i even went back to version 671 and still got the same problem.
I am now going to go right back to 667 and see if this still happens, because i cant pinpoint the problem either.
I even converted the 50min video from an event i shot last weekend to dvd and burnt it to disc for someone, and the A/V sync problem seemed to be worse in the mpeg2 program stream.
Anyway, i hope you can get your problem sorted, all i can do it keep playing around with it until i get it right, however i am lucky with the video i shot last weekend, there was only a 3 minite segment in all the 53 minutes of content that i shot that i wanted to cut out, but because i wanteD to get the final video output and sent to my clients, i just left that 3 minutes in the video, so there is no A/V sync problems.

http://www.videoredo.net/msgBoard/showthread.php?34122-A-V-Sync-VRD-4-21-4-671c
http://www.videoredo.net/msgBoard/showthread.php?34122-A-V-Sync-VRD-4-21-4-671c
 

Danr

Administrator
Staff member
Are these H.264 files or mpeg2? The only video sync issue I know of at this time is H.264 when using smart cutting and that's been addressed for the next beta (due out shortly).
 

glenpinn

Member
im not sure why my video has developed this A/V sync issue, i even went back to version 667 just now and did the same cut and the output files still have this minor A/V sync issue.

cheers
 
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dsscottage

New member
Are these H.264 files or mpeg2? The only video sync issue I know of at this time is H.264 when using smart cutting and that's been addressed for the next beta (due out shortly).
In my case, MediaInfo identifies the video as MPEG-TS.
 

Dan203

Senior Developer
Staff member
Can you please switch MediaInfo to text view and then copy/paste the complete info here so we can see what we're dealing with.
 

dsscottage

New member
Can you please switch MediaInfo to text view and then copy/paste the complete info here so we can see what we're dealing with.
The audio sync problem happens on many but not all files. Here is the Mediainfo for the most recent example:
General
Complete name : C:\Users\Gary\Videos\concert.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 65.3 MiB
Duration : 5mn 18s
Overall bit rate mode : Variable
Overall bit rate : 1 721 Kbps
Encoded date : UTC 2013-07-29 15:41:59
Tagged date : UTC 2013-07-29 15:41:59
gsst : 0
gstd : 318483
gssd : B4A7DAEA3HH1384024594802837
gshh : r12---sn-tt17rn7d.googlevideo.com

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings, CABAC : Yes
Format settings, ReFrames : 1 frame
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 5mn 18s
Bit rate : 1 526 Kbps
Maximum bit rate : 2 695 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.055
Stream size : 57.9 MiB (89%)
Tagged date : UTC 2013-07-29 15:42:06

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 5mn 18s
Bit rate mode : Variable
Bit rate : 192 Kbps
Maximum bit rate : 202 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 7.29 MiB (11%)
Title : IsoMedia File Produced by Google, 5-11-2011
Encoded date : UTC 2013-07-29 15:42:03
Tagged date : UTC 2013-07-29 15:42:06
 

Dan203

Senior Developer
Staff member
Not for VRD, but some players assume all 720p content is 59.94 and can have trouble with other frame rates.

Can you set your capture device to capture the audio at 48KHz instead of 44.1? Some programs use weird time code tricks to support 44.1KHz audio and I'm wondering that's the case here.
 
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dsscottage

New member
Not for VRD, but some players assume all 720p content is 59.94 and can have trouble with other frame rates.

Can you set your capture device to capture the audio at 48KHz instead of 44.1? Some programs use weird time code tricks to support 44.1KHz audio and I'm wondering that's the case here.
Yes I can set the capture device as you suggest. However, when I rip a DVD, I don't want to lose quality by recoding and the original is usually 720p/29.97 and 44.1. When I play back the original rip there is no sync problem. It's only after I edit with VRD and even then it only happens on about 60% of the projects. I can't see any commonality that would lead me to the problem.
 
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