Answers.Body: <p>You should check your recorded video with <a href="http://mediainfo.sourceforge.net/en" rel="nofollow">MediaInfo</a>. Regarding your problem, it shows,</p>
  
  <ul>
  <li>if the durations of the video and the audio is the same or not,</li>
  <li>if the interleave of the audio (the starting offset) is set correctly</li>
  <li>in which sampling rate your audio was recorded.</li>
  </ul>
  
  <p>Then, I would import your video file into <a href="http://audacity.sourceforge.net/" rel="nofollow">Audacity</a> (which imports only the audio, of course). </p>
  
  <ul>
  <li>On the left side of each track you find the sampling rate, too. Is this the same sampling rate as being reported by MediaInfo?</li>
  <li>Does Audacity play the audio too slow, too?</li>
  </ul>
  
  <p>My impression from the symptoms that you describe is that the audio is recorded at a certain sampling rate, but reported as a lower sampling rate, or not at all.</p>
  
  <p>Try to modify your sampling rate, either in your recordings settings, or in the Windows system. On Win7, it's under <em>Control Panel->Hardware &amp; Sound->Manage Audio Devices->Recording</em>. There, select your microphone, then <em>Properties->Advanced</em>. There you can change the sampling rate.</p>
  
  <p>If changing the sampling rate doesn't help, then you can only try another webcam software, or record the audio independently.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2013-02-07T10:15:20.700Z
Answers.LastActivityDate: 2013-02-07T10:15:20.700Z
Answers.UserDisplayName: Fred42vid
Answers.Body: <p>Best way to check if it's out of sync or drifting, or both would be make a recording, clap with your hands once at the beginning and at the end.  Check if the sound is earlier or later at the beginning or the end.  Then to resync, use an Non Linear Editing program to align and possibly re-time the audio, retiming the video will look much worse than fixing the sound.  Also recording at 15fps rather than 30 won't look great.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2013-02-19T00:10:51.620Z
Answers.LastActivityDate: 2013-02-19T00:10:51.620Z
Answers.UserDisplayName: Dan M
Answers.Body: <p>I think you should try another program first and see the result. Maybe the software is the reason or tweak the settings of yours.
  Also try to close any other software which is running at that time like antivirus programs etc. </p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2013-07-05T07:57:59.160Z
Answers.LastActivityDate: 2013-07-05T07:57:59.160Z
Answers.UserDisplayName: Igor hristov
Answers.Body: <p>The quick answer that worked for me:  do NOT save your captured video to a drive on the computer, save it to an external drive that runs at 7200 RPM   (many are 5400).</p>
  
  <p>This problem was driving me crazy.  I checked so many blogs, FAQs and help lines, but nothing worked.  Finally a salesman at B&amp;H Photo in NYC pointed me in the right direction (this is not an endorsement, but I do want to give credit where credit is due, and his suggestion definitely solved my problem!)</p>
  
  <p>Some detail:  I was capturing old VHS tapes from a tape deck directly to PC; an old Gateway EDX4840-15 workhorse.  I use Media Express (not crazy about the software, but it worked) capturing to AVI files (the only choice, oddly).  Originally I captured to the internal drive and all the captured video would gradually get out of sync, as described.   It would start out synced, gradually getting more and more out.    Capturing to the external drive at 7200 solved the problem.   The drive I used is a G-Drive Mobile USB 2TB, but I suspect any 7200 drive would work.     After the capture I move the files to my regular 5400 drives for long term storage (I have a lot of them).   Note:  once I mistakenly captured to an external 5400 drive, and the sync problem re-emerged, so the faster drive is definitely the problem solver.   Now that I think of it, if you have a 7200 internal drive, maybe that would work okay.   I don't know the speed of my internal drives at the time of this writing, but it's a thought.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-04-22T03:58:17.030Z
Answers.LastActivityDate: 2017-04-22T03:58:17.030Z
Answers.UserDisplayName: Michael McG
Answers.Body: <p>There are quality settings for both the audio and video recording.  Have you checked out the video capture settings?  Maybe some adjustment here would get the audio and video back in sync.</p>
  <p><img src="https://i.sstatic.net/R5zbB.jpg" alt="Video Stream Format Properties" /></p>
  <p>The picture is from <a href="http://support.dell.com/support/topics/global.aspx/support/kcs/document?c=us&amp;cs=04&amp;docid=116999" rel="nofollow noreferrer">this</a> Dell support site.  May be some more useful info there.</p>
  <p>Also, just in general (sorry if it's obvious) are you sure your drivers for the webcam are up to date?</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-10-09T15:49:03.240Z
Answers.LastActivityDate: 2012-10-09T15:49:03.240Z
Answers.LastEditDate: 2020-06-17T09:53:03.607Z
Answers.UserDisplayName: JoshP
Answers.Body: <p>I am experiencing this problem and I am implementing a solution. Presently I used a program to extract the audio into .mp3 format separate, and Windows Movie Maker to extract the video alone into a .wmv silent video. Since I have the .mp3 file I loaded it into Audacity so that I can add and subtract time in order to synchronize the audio file manually into Windows Movie Maker along with the .wmv silent video. Having split the out-of-sync video into constituent video and audio parts, I am going to use Windows Movie Maker to integrate an edited version of the audio file on the fly as I edit it in Audacity.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-10T14:56:12.430Z
Answers.LastActivityDate: 2018-02-10T14:56:12.430Z
Answers.UserDisplayName: Brian Jacob Meagher
Answers.Body: <p>I had the same problem with audio being out of sync with the image, recording from my webcam using screen recorder. In my case it seems it was caused by the time it takes for the webcam to activate. I changed 'delay before capture' to 2 seconds and it seems to have fixed the problem. </p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-12-20T15:51:02.603Z
Answers.LastActivityDate: 2017-12-20T15:51:02.603Z
Answers.UserDisplayName: Richard
Body: <p><em>I make a 30 second recording using a webcam on a laptop. When I play the .avi file afterwards, the audio and video are out of step. The sound starts arriving about a second after it should do and gets increasingly delayed.</em></p>
  
  <p><strong>Why is this?</strong></p>
  
  <p>Whilst I am making the recording, I can see the video that is being captured being displayed on the laptop monitor. I can actually get lip synch if I  s-p-e-a-k  l-i-k-e  t-h-i-s. </p>
  
  <p>I clap my hands at the start of the video. When I watch the video afterwards, the sounId is delayed by about a second.</p>
  
  <p>The audio track continues for about ten or so seconds after the video component has finished. (A still image remains in the video player while the voice continues.)</p>
  
  <p>I can fix this problem after the recording (laboriously), but I want to have the recording work properly in the first place.</p>
  
  <p>The webcam is a BisonCam NB Pro integrated into the laptop. It is a 2 Megapixel camera that can record at 15 fps. The CPU is an Intel dual core T4200. The machine has 4GB of RAM. I am saving the recording to a file on a ramdisk, so I don't think the hard drive is the problem. I am using BisonCap to record, the software that came with the computer. I have set recording for 15 fps.</p>
  
  <p>Please help!</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-02-11T06:31:05.573Z
Comments.Text: decrease bitrate to 512 and set screen size to custom instead of full screen. worked for me
Comments.UserDisplayName: sashank
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-02-11T16:51:24.320Z
Comments.Text: Try different software - I guess that whatever came with your laptop is broken in some way.
Comments.UserDisplayName: Jonas Czech
Tags: <video><digital-recording><live><hardware>
Title: Why is Audio and Video out of Sync during recording?
UserDisplayName: user75798
ThreadText: # Why is Audio and Video out of Sync during recording?
  
  (Asked by: username_0 on 2012-10-06)
  
  *I make a 30 second recording using a webcam on a laptop. When I play the .avi file afterwards, the audio and video are out of step. The sound starts arriving about a second after it should do and gets increasingly delayed.*
  
  **Why is this?**
  
  Whilst I am making the recording, I can see the video that is being captured being displayed on the laptop monitor. I can actually get lip synch if I s-p-e-a-k l-i-k-e t-h-i-s.
  
  I clap my hands at the start of the video. When I watch the video afterwards, the sounId is delayed by about a second.
  
  The audio track continues for about ten or so seconds after the video component has finished. (A still image remains in the video player while the voice continues.)
  
  I can fix this problem after the recording (laboriously), but I want to have the recording work properly in the first place.
  
  The webcam is a BisonCam NB Pro integrated into the laptop. It is a 2 Megapixel camera that can record at 15 fps. The CPU is an Intel dual core T4200. The machine has 4GB of RAM. I am saving the recording to a file on a ramdisk, so I don't think the hard drive is the problem. I am using BisonCap to record, the software that came with the computer. I have set recording for 15 fps.
  
  Please help!
  
  **Tags:** video, digital-recording, live, hardware
  
  > **Comments:**
  > **username_1**: decrease bitrate to 512 and set screen size to custom instead of full screen. worked for me  
  > **username_2**: Try different software - I guess that whatever came with your laptop is broken in some way.  
  
  ---
  
  ## 7 answers
  
  ### Answer by username_3 on 2013-02-07. Score: 2 | Accepted answer
  
  You should check your recorded video with [MediaInfo](http://mediainfo.sourceforge.net/en). Regarding your problem, it shows,
  
  * if the durations of the video and the audio is the same or not,
  * if the interleave of the audio (the starting offset) is set correctly
  * in which sampling rate your audio was recorded.
  
  Then, I would import your video file into [Audacity](http://audacity.sourceforge.net/) (which imports only the audio, of course).
  
  * On the left side of each track you find the sampling rate, too. Is this the same sampling rate as being reported by MediaInfo?
  * Does Audacity play the audio too slow, too?
  
  My impression from the symptoms that you describe is that the audio is recorded at a certain sampling rate, but reported as a lower sampling rate, or not at all.
  
  Try to modify your sampling rate, either in your recordings settings, or in the Windows system. On Win7, it's under *Control Panel->Hardware & Sound->Manage Audio Devices->Recording*. There, select your microphone, then *Properties->Advanced*. There you can change the sampling rate.
  
  If changing the sampling rate doesn't help, then you can only try another webcam software, or record the audio independently.
  
  
  ---
  
  ### Answer by username_4 on 2013-02-19. Score: 1
  
  Best way to check if it's out of sync or drifting, or both would be make a recording, clap with your hands once at the beginning and at the end. Check if the sound is earlier or later at the beginning or the end. Then to resync, use an Non Linear Editing program to align and possibly re-time the audio, retiming the video will look much worse than fixing the sound. Also recording at 15fps rather than 30 won't look great.
  
  
  ---
  
  ### Answer by username_5 on 2013-07-05. Score: 1
  
  I think you should try another program first and see the result. Maybe the software is the reason or tweak the settings of yours.
  Also try to close any other software which is running at that time like antivirus programs etc.
  
  
  ---
  
  ### Answer by username_6 on 2017-04-22. Score: 1
  
  The quick answer that worked for me: do NOT save your captured video to a drive on the computer, save it to an external drive that runs at 7200 RPM (many are 5400).
  
  This problem was driving me crazy. I checked so many blogs, FAQs and help lines, but nothing worked. Finally a salesman at B&H Photo in NYC pointed me in the right direction (this is not an endorsement, but I do want to give credit where credit is due, and his suggestion definitely solved my problem!)
  
  Some detail: I was capturing old VHS tapes from a tape deck directly to PC; an old Gateway EDX4840-15 workhorse. I use Media Express (not crazy about the software, but it worked) capturing to AVI files (the only choice, oddly). Originally I captured to the internal drive and all the captured video would gradually get out of sync, as described. It would start out synced, gradually getting more and more out. Capturing to the external drive at 7200 solved the problem. The drive I used is a G-Drive Mobile USB 2TB, but I suspect any 7200 drive would work. After the capture I move the files to my regular 5400 drives for long term storage (I have a lot of them). Note: once I mistakenly captured to an external 5400 drive, and the sync problem re-emerged, so the faster drive is definitely the problem solver. Now that I think of it, if you have a 7200 internal drive, maybe that would work okay. I don't know the speed of my internal drives at the time of this writing, but it's a thought.
  
  
  ---
  
  ### Answer by username_7 on 2012-10-09. Score: 1
  
  There are quality settings for both the audio and video recording. Have you checked out the video capture settings? Maybe some adjustment here would get the audio and video back in sync.
  
  ![Video Stream Format Properties](https://i.sstatic.net/R5zbB.jpg)
  
  The picture is from [this](http://support.dell.com/support/topics/global.aspx/support/kcs/document?c=us&cs=04&docid=116999) Dell support site. May be some more useful info there.
  
  Also, just in general (sorry if it's obvious) are you sure your drivers for the webcam are up to date?
  
  
  ---
  
  ### Answer by username_8 on 2018-02-10. Score: 0
  
  I am experiencing this problem and I am implementing a solution. Presently I used a program to extract the audio into .mp3 format separate, and Windows Movie Maker to extract the video alone into a .wmv silent video. Since I have the .mp3 file I loaded it into Audacity so that I can add and subtract time in order to synchronize the audio file manually into Windows Movie Maker along with the .wmv silent video. Having split the out-of-sync video into constituent video and audio parts, I am going to use Windows Movie Maker to integrate an edited version of the audio file on the fly as I edit it in Audacity.
  
  
  ---
  
  ### Answer by username_9 on 2017-12-20. Score: -1
  
  I had the same problem with audio being out of sync with the image, recording from my webcam using screen recorder. In my case it seems it was caused by the time it takes for the webcam to activate. I changed 'delay before capture' to 2 seconds and it seems to have fixed the problem.
  
  
  ---
  
  