Body: <p>I recorded myself playing some games and then uploaded the videos to youtube. I noticed that after youtube finished all processing and made multiple resolutions available that the audio and video drift apart over time. As in, it starts out synced but after about an hour there is a noticeable drift. A friend of mine has no issue with the videos on Linux and the A/V is synced when I play the video on my iPad. The A/V is out of sync on every Windows and OSX computer I've tried. On OSX I even tried three different browsers with the same effect.</p>
  
  <p>Things I've tried that didn't seem to make a difference:</p>
  
  <ul>
  <li>Using OBS and OBS-MP</li>
  <li>Constant frame rate (60fps)</li>
  <li>Variable frame rate</li>
  <li>Transcoding with hand brake before uploading to set a constant frame rate</li>
  <li>Using the "Web Optimized" checkbox in hand brake</li>
  <li>Lots of different recording options like audio sampling rate, etc</li>
  <li>Different browsers</li>
  <li>Disabling hardware accelerated decode: <a href="https://productforums.google.com/forum/#!topic/youtube/ZzW5iQfix3w" rel="nofollow">https://productforums.google.com/forum/#!topic/youtube/ZzW5iQfix3w</a></li>
  </ul>
  
  <p>Interestingly when I play the video back using this player instead of the direct youtube link, I don't see the audio drift: <a href="http://youtubeaudiosync.tumblr.com/" rel="nofollow">http://youtubeaudiosync.tumblr.com/</a></p>
  
  <p>And it's not just all youtube videos that are out of sync for me, this recording (not by me) is 1+ hours and it's perfectly in sync for me even if I skip to the end: <div class="youtube-embed"><div>
                  <iframe width="640px" height="395px" src="https://www.youtube.com/embed/pVUV0Yk41tY?start=0"></iframe>
              </div></div></p>
  
  <p>Another data point about the video above is that I can install the h264ify extension in Chrome and watching the avc codec version of that video it is still perfectly synced for me. I was starting to think it was as simple as the avc codec not playing correctly on my computer, but now I think the problem is more subtle than that.</p>
  
  <p>Here is the video that I use for testing. It's acting up for me anywhere after an hour. For a really good test, skip to about 4 hours in to see if you have desync too: <div class="youtube-embed"><div>
                  <iframe width="640px" height="395px" src="https://www.youtube.com/embed/tblZCUO_Qkk?start=0"></iframe>
              </div></div></p>
  
  <p>As far as I can tell, the source video is "fine" in that some players have no problem with it, but once youtube processes, it has issues playing back on <em>some</em> computers. I've googled a bunch for issues like this, but I'm having a hard time finding a fix. I believe the issue has to do with which codec youtube serves up to the client. The link above that works for me happens to be the VP9 codec whereas my uploads are playing back on windows using the avc1 codec. You can see this by right clicking on the video and checking the "Stats for Nerds".</p>
  
  <p><strong>How can avoid YouTube A/V sync issues in my recordings? Do I have any control here?</strong></p>
  
  <p>Thanks in advance!</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-01-20T07:21:34.343Z
Comments.Text: Is the source made by joining multiple files?
Comments.UserDisplayName: jiggunjer
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-01-20T18:39:19.637Z
Comments.Text: No. I recorded all of my test cases as one file each.
Comments.UserDisplayName: Jason Dagit
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-01-21T01:30:49.237Z
Comments.Text: is the source variable framerate?
Comments.UserDisplayName: jiggunjer
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-01-21T04:57:36.670Z
Comments.Text: As I mention in the question, I've tried recording in OBS/OBS-MP both ways, meaning with variable frame rate and with constant frame rate. In both cases I see the audio drift.
Comments.UserDisplayName: Jason Dagit
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-02-08T10:31:37.917Z
Comments.Text: I'm having the exact same problem and i have tried all that you have done yet i still don't know why it wont fix. Did you end up finding a solution?
Comments.UserDisplayName: Aaron Parthimos
Tags: <video><audio><youtube><sync>
Title: Audio drift after uploading to YouTube?
UserDisplayName: Jason Dagit
ThreadText: # Audio drift after uploading to YouTube?
  
  (Asked by: username_0 on 2016-01-19)
  
  I recorded myself playing some games and then uploaded the videos to youtube. I noticed that after youtube finished all processing and made multiple resolutions available that the audio and video drift apart over time. As in, it starts out synced but after about an hour there is a noticeable drift. A friend of mine has no issue with the videos on Linux and the A/V is synced when I play the video on my iPad. The A/V is out of sync on every Windows and OSX computer I've tried. On OSX I even tried three different browsers with the same effect.
  
  Things I've tried that didn't seem to make a difference:
  
  * Using OBS and OBS-MP
  * Constant frame rate (60fps)
  * Variable frame rate
  * Transcoding with hand brake before uploading to set a constant frame rate
  * Using the "Web Optimized" checkbox in hand brake
  * Lots of different recording options like audio sampling rate, etc
  * Different browsers
  * Disabling hardware accelerated decode: <https://productforums.google.com/forum/#!topic/youtube/ZzW5iQfix3w>
  
  Interestingly when I play the video back using this player instead of the direct youtube link, I don't see the audio drift: <http://youtubeaudiosync.tumblr.com/>
  
  And it's not just all youtube videos that are out of sync for me, this recording (not by me) is 1+ hours and it's perfectly in sync for me even if I skip to the end:
  
  Another data point about the video above is that I can install the h264ify extension in Chrome and watching the avc codec version of that video it is still perfectly synced for me. I was starting to think it was as simple as the avc codec not playing correctly on my computer, but now I think the problem is more subtle than that.
  
  Here is the video that I use for testing. It's acting up for me anywhere after an hour. For a really good test, skip to about 4 hours in to see if you have desync too:
  
  As far as I can tell, the source video is "fine" in that some players have no problem with it, but once youtube processes, it has issues playing back on *some* computers. I've googled a bunch for issues like this, but I'm having a hard time finding a fix. I believe the issue has to do with which codec youtube serves up to the client. The link above that works for me happens to be the VP9 codec whereas my uploads are playing back on windows using the avc1 codec. You can see this by right clicking on the video and checking the "Stats for Nerds".
  
  **How can avoid YouTube A/V sync issues in my recordings? Do I have any control here?**
  
  Thanks in advance!
  
  **Tags:** video, audio, youtube, sync
  
  > **Comments:**
  > **username_1**: Is the source made by joining multiple files?  
  > **username_0**: No. I recorded all of my test cases as one file each.  
  > **username_1**: is the source variable framerate?  
  > **username_0**: As I mention in the question, I've tried recording in OBS/OBS-MP both ways, meaning with variable frame rate and with constant frame rate. In both cases I see the audio drift.  
  > **username_2**: I'm having the exact same problem and i have tried all that you have done yet i still don't know why it wont fix. Did you end up finding a solution?  
  
  ---
  
  ## 0 answers
  
  