Audio unsynced on youtube?

[arjemma]

I'm sorry if this isn't the right place, feel free to move it.
I have a problem with my most recent video. The rendered version is all fine, and it plays perfectly on the computer.
Then I upload it to youtube and the audio isn't synced anymore.
Anyone who knows what the problem might be?

[mirkosp]

Youtube isn't getting it right, happens rather often when you don't feed it avi vids. Re-encode to xvid+mp3. Interleaving is the only thing that can really assure you the tube'll get the sync right.

[NeoQuixotic]

I've been uploading MP4s and now MKVs for the past year and I've only had a problem once with sync. It seems that YouTube just messes up every once and while. But might as well try other containers and codecs.

[mirkosp]

Perhaps I'm the unlucky one, but rare have been the cases when h.264+aac mp4s worked. And it just won't take mkv for me (although that might have been due to flac audio).

[Darklydone]

I've only had that trouble in mp4s when using b-pyramid instead of mb-tree.

[Mister Hatt]

What do you mean instead of? You can use both at the same time, they are completely unrelated unless you are using an OLD build of x264. Given inside knowledge on what YouTube actually use, any interleaved container will store your crap fine and there won't be a sync issue. Occasionally their buffer messes up on VBR audio, and a similar thing can be found on VFR video. If you do find sync issues on an interleaved video, make sure you have constant bitrate and framerate and it should be fine.