Audio sync / rendering issues on Ubuntu 12.04

Thanks for reporting this issue and trying to make Ubuntu better, and sorry for having taking some time to answer.

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Hi Walter, thanks for the response. I have run the command as instructed.

Hi,
Effectively, this issue comes from MLT. The only solution that we have for the moment is to upgrade this one. And we are not lucky because the official version in Ubuntu (0.7.4 or 0.7.6, I don't remember exactly) is full of bugs.
What is your version of MLT ?
The only solution is to update this one following this FAQ : https://answers.launchpad.net/openshot/+faq/1861
Good Luck waiting our own library.

Thanks Cenwen. The problem is that the version of MLT in the Sunab repository conflicts with the requirements of the Openshot package in the Openshot PPA. So you can't have both installed at the same time. I can't even test if the problem is fixed in the versions in the Sunab PPA because of the problem.

For now I'll keep copying everything back to an 11.10 VM to render the final video, but it's a big PITA.

Hum, I am using currently the last version of MLT unstable i.e. 0.8.1 on precise 12.04 without any problem. And it is without guarantee that your audio sync will be resolved. I have more hopes in our library.
Here the screenshot of my dependencies if it can help you. http://pix.toile-libre.org/?img=1346270147.png

With the following in my /etc/apt/sources.list:

# Openshot PPA
deb http://ppa.launchpad.net/openshot.developers/ppa/ubuntu precise main
# deb-src http://ppa.launchpad.net/openshot.developers/ppa/ubuntu precise main

# PPA for MLT
deb http://ppa.launchpad.net/sunab/kdenlive-release/ubuntu precise main
#deb-src http://ppa.launchpad.net/sunab/kdenlive-release/ubuntu precise main

When I upgrade, only two packages are upgraded:

$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
  libmlt++3 melt
The following packages will be upgraded:
  libmlt-data libmlt4
2 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.

If I attempt to dist-upgrade:

$ sudo apt-get dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be REMOVED
  libmlt4 openshot python-mlt3
The following NEW packages will be installed
  libmlt5
The following packages will be upgraded:
  libmlt++3 melt

I don't want to remove openshot, but can't upgrade to libmlt5 without removing it.

That is fixed in the next version which will be released soon (bug here: https://bugs.launchpad.net/openshot/+bug/1002675)

That is included in the Daily PPA, so you have the option of using that, but with the caveat that you could experience some bleeding edge type issues.

Actually, I'm not too sure about packaging bugs and the daily ppa, as the packaging stuff lives in a different branch. So my comment above may or may not be accurate :-)