Audio and video sync

[Elsie]

I ran across a video that appears to have a steady audio drift and was trying to find a program that could fix that problem. I tried SyncView, but it doesn't appear to save the file, only to tell me how far out the video/audio is out. I tried doing a search on this site, but that gets stuck on "Loading Results".

If someone could tell me what tool could help me with this, I surly would appreciate it.

[hech54]

I ran across a video that appears to have a steady audio drift

What exactly does that mean?
It gets worse as it plays.......or the sync difference stays the same throughout the entire clip?

[Elsie]

I mean "It gets worse as it plays......." It starts out correctly, and consistently gets worse, leading me to believe SyncView is correct. If the sync started off and stayed the same, I could easily fix it with my editor, by, either cutting a frame or padding a frame. Thus, a tool to either stretch or shrink the audio or video...

[hello_hello]

I wonder what sort of file it is??

If it's truly a gradual loss of sync, simply changing the frame rate a tiny bit might fix it. Chances are though, it goes out in distinct steps, a little further each time, but you never know...... the tool you'd use to adjust the frame rate might depend on the file type.

[Elsie]

General
Complete name : temp.avi
Format : AVI
Format/Info : Audio Video Interleave
File size : 943 MiB
Duration : 1h 38mn
Overall bit rate : 1 334 Kbps
Writing application : Lavf52.105.0

Video
ID : 0
Format : MPEG-4 Visual
Format profile : Simple@L1
Format settings, BVOP : No
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Codec ID : XVID
Codec ID/Hint : XviD
Duration : 1h 38mn
Bit rate : 1 193 Kbps
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate : 30.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.129
Stream size : 843 MiB (89%)
Writing library : Lavc52.117.0

Audio
ID : 1
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Mode : Joint stereo
Mode extension : MS Stereo
Codec ID : 55
Codec ID/Hint : MP3
Duration : 1h 38mn
Bit rate mode : Constant
Bit rate : 128 Kbps
Channel(s) : 2 channels
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 90.4 MiB (10%)
Alignment : Aligned on interleaves
Interleave, duration : 26 ms (0.78 video frame)
Interleave, preload duratio : 52 ms
Writing library : LAME3.97


I ended up inserting a blank frame(s) every 5 minutes to get the lips to sync with the audio. Would have liked a program that could have stretched the video or shrink the audio. I can't remember what SyncView said now. And the above info is what it is now. The original is now deleted. However, still would like such a program for future use, if one exists.

[manono]

Virtual Dub. Changing the video framerate to 29.97fps might have fixed it, depending on the total number of frames you had to insert to fix the audio synch problem.

I ended up inserting a blank frame(s) every 5 minutes to get the lips to sync with the audio.

Which required reencoding the whole thing, while changing the framerate doesn't.

[Elsie]

So the answer is Virtual Dub? I thought the audio was "attached" to the video? Wouldn't changing the frame rate would affect the video AND audio?

[Elsie]

Is this what I should be looking at?
https://forum.videohelp.com/threads/87685-How-to-fix-gradual-loss-of-sync-once-and-for-all
Or is that outdated?

[manono]

So the answer is Virtual Dub?

Yes, for XviD AVIS with MP3 audio as in your MediaInfo printout.

Wouldn't changing the frame rate would affect the video AND audio?

No.

Is this what I should be looking at?

No, not if you want to change the video framerate.

You go into the Video section in VDub and set Video for 'Direct stream copy', and then hit 'Frame Rate', followed by changing it to whatever you like in the new screen. Then go File->Save as AVI. Changing from 30fps to 29.97fps will lengthen the video by roughly 3.5 seconds per hour or roughly 5.5 seconds for your particular video. This means (very) roughly 170 new frames added doing it the way you did. If you didn't add nearly that many frames then you'd adjust the framerate to a figure greater than 29.97fps.

[Elsie]

Hey Thanks!

[acheter]

Audio Video Synchronizer can synchronize audio and video of movie. If the audio/video is out of sync, the program can help you correct the problem. It supports the video formats like avi, wmv, mpg, asf, dat, vcd, mpeg. If extra decoders are installed, it can support more formats such as divx, xvid, dv, mkv, ogm, svcd, dsm. The output video can be WMV or AVI. If you install more multiplexers/muxers, the program can output more video formats. So the program is a video converter also.

[Elsie]

I couldn't find "Audio Video Synchronizer" on fideohelp, but I did find it on weqsoft.com, so thanks!

[manono]

The output video can be WMV or AVI. If you install more multiplexers/muxers, the program can output more video formats. So the program is a video converter also.

Why would anyone want to reencode and degrade the video, when just by stretching the audio you can leave the video alone?

It says it supports only "XP/2003/VISTA", although that might not be correct. And it's a commercial product. It costs $39.99 with no word if the demo is fully functional or not (meaning it probably isn't). Your post is useless spam.

[Elsie]

Oh...