[Kdenlive-devel] Audio sync issue

el jefe delito eljefedelito at gmail.com
Fri Feb 8 14:05:25 UTC 2013

Thanks for the help.

> To the original poster, you need to provide a sample file, the project
> settings, and the render settings in order to investigate.

My Nikon clips are 1280x720 at 23.98 FPS so that's what I changed my
project file to use.  I exported this at the H.264 setting with default
values, and the output appears perfect.  However, I need a logo overlay /
watermark and trying to do that in the original project, the KDEnlive
editor wanted to composite that image with a specific video track; my video
is edited and on multiple tracks so I thought it'd be easier to add as a
new project (and yes, I'd lose some quality with the re-render).

Ok, so the first output looks great.  The next run, new project, same
project settings and using only the recently exported file and a
transparent-background jpg, however, tells me at Render time that there are
No Matching Profiles for the H.264 option — which should be the exact
profile that I just used!  How can it not match itself?  If I use it
anyways, I get audio sync issues worse than ever.

Attached are the two projects I've been working on (normal edit, and then
where I just add the overlay watermark).  However, I don't have a short,
decent clip to use to demo these sync issues so I'll have to shoot that
later and send it in 10 hours or so.

On Thu, Feb 7, 2013 at 5:37 PM, Dan Dennedy <dan at dennedy.org> wrote:

> On Thu, Feb 7, 2013 at 1:50 PM, Dan Dennedy <dan at dennedy.org> wrote:
> > On Thu, Feb 7, 2013 at 1:12 PM, Doran Barton <fozz at iodynamics.com>
> wrote:
> >> I have had similar issues.
> >
> > That is not saying much. A/V sync has been a problem for every media
> > tool since day 1 and will continue to be.
> >
> >> For example, when editing a project that combines
> >> video from my Panasonic HD camera and my Canon DV cameras, I get some
> audio
> >> sync drift.
> >>
> >> The HD files are 59.94 fps, 44.1k audio sample rate.
> >>
> >> The DV files are 29.97 fps, 48k audio sample rate.
> >>
> >> Could the sample rate be causing some of the sync issues?
> >
> > Maybe but doubtful. Only detailed analysis of specific scenarios will
> > go somewhere.
> I should mention that the latest version of MLT (0.8.8) fixes an A/V
> sync bug when you split the audio/video on the timeline:
>  - "Automatically split audio and video" in Settings > Timeline
>  - right-click clip on timeline and choose "Split Audio" or
>  - individually place the same clip on a video track and audio track
> Also, in middle of 2012, I made major changes to the seek and sync-ing
> within MLT's avformat module due to some problematic files/formats
> under versions prior to 0.8.2. Of course, there were a couple of
> regressions found shortly after that. Basically, if you are using
> version 0.8.2 or 0.8.6, it is time to try with latest version 0.8.8. I
> have some standalone binary builds if you want to make a quick try
> without depending upon your distro packages.
> http://builds.meltytech.com/kdenlive/kdenlive-fedora17-x86_64-20130207.tar.bz2
> http://builds.meltytech.com/kdenlive/kdenlive-ubuntu11.10-x86_64-20130207.tar.bz2
> http://builds.meltytech.com/kdenlive/kdenlive-ubuntu11.10-x86-20130207.tar.bz2
> Look for the start-kdenlive script after unpacking.
> The ubuntu builds work on newer versions of Ubuntu in addition to
> Debian 7 and OpenSUSE 12.
> --
> +-DRD-+
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e: eljefedelito at gmail.com
t: @robodioxide
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