Multiple Syncking / Syncking problem

[abdelilah]

Salam and good Ramadan everyone

I have a strange problem with a video, in the first 15 minutes the audio is 3 seconds faster than the video, after that the audio is faster by 10 seconds and so one, is there any tool to resync audio without reencoding the whole video (I’ve did it with tempgenc but the isn’t multiple resyncking for it).

Here is the report.

Format                           : Windows Media
File size                        : 812 MiB
Duration                         : 1h 29mn
Overall bit rate mode            : Variable
Overall bit rate                 : 1 266 Kbps
Maximum Overall bit rate         : 3 086 Kbps
Encoded date                     : UTC 2009-08-04 01:14:30.897

Video
ID                               : 2
Format                           : WMV2
Codec ID                         : WMV2
Codec ID/Info                    : Windows Media Video 8
Description of the codec         : Windows Media Video V8
Duration                         : 1h 29mn
Bit rate mode                    : Variable
Bit rate                         : 1 174 Kbps
Width                            : 720 pixels
Height                           : 526 pixels
Display aspect ratio             : 4/3
Frame rate                       : 25.000 fps
Resolution                       : 24 bits
Bits/(Pixel*Frame)               : 0.124
Stream size                      : 753 MiB (93%)
Language                         : French

Audio
ID                               : 1
Format                           : WMA2
Format profile                   : L1
Codec ID                         : 161
Codec ID/Info                    : Windows Media Audio 2
Description of the codec         : Windows Media Audio 9.2 -  64 kbps, 44 kHz, stereo (A/V) 1-pass CBR
Duration                         : 1h 29mn
Bit rate mode                    : Constant
Bit rate                         : 64.0 Kbps
Channel(s)                       : 2 channels
Sampling rate                    : 44.1 KHz
Resolution                       : 16 bits
Stream size                      : 41.1 MiB (5%)
Language                         : French

Thanks in advance

[poisondeathray]

Did you make this wmv? If so what was the source and how did you do it?

Have you tried other media players to rule out playback issue possiblities? e.g. KMplayer, SMplayer, VLC ?

What you describe is usually caused by different audio/video lengths. An offset would have a constant delay like 3sec throughout the entire video.

Do a test: use asfbin to extract the audio & the video separately and play each to determine if the running time is the same. Mediainfo can be inaccurate, and reports it as the same. If this is the case, you would have to shrink/expand either the audio or video to match durations

The 2nd possibility is you have a wrong fps. (e.g. it should have been playing back at 29,97 or some other frame rate), I can't think of any tools that change the fps without re-encoding in wmv type files. (You can in other containers like .avi)

The 3d possibility is that you have a VFR (variable frame rate) wmv. Not much you can do short of re-encoding and using avisynth to make it CFR, with directshowsource, and convertfps=true. And that won't necessarily work.

[abdelilah]

I've used kmplayer,wmp and other,the fps is constant but the result is the same,thnx I will try the tools you've told me.

[abdelilah]

Salam everyone

Well I've separated the audio/video the result is strange but as expected (it is a downloaded video) :

audio : 01:29:42:00
video : 01:29:43:00

How can I sync this stuff since the video misses some frames from time to time.

Thanks in advance.

[poisondeathray]

How can I sync this stuff since the video misses some frames from time to time.

If there are missing frames, damage or corruption, dropouts, that sort of thing - then it's next to impossible to fix. You would have to cut out the bad parts, and sync up each section with offest manually. Not worth the hassle.

[abdelilah]

Thanks to everyone for the help.