[Kdenlive-devel] Audio sync issue

Fri Feb 8 21:06:03 UTC 2013

Thanks for getting back to me.

> Are you referring to just image quality or also A/V sync?
Both the visual and the syncing look good.

> Does the A/V sync look good in Kdenlive's monitors even after scrubbing
or seeking?
Yes, at all points during my editing process the sync seems to be just fine.

> Can you reproduce the problem by simply placing a clip on a timeline
> by itself, rendering that, make a new project, add the rendered clip
> to a timeline by itself, and render that?
I will try this tonight and get back to you.

> If so, can you reproduce it using one of the binary builds I provided
> to this thread yesterday?
I will try this as well.

Thanks again!

On Fri, Feb 8, 2013 at 2:59 PM, Dan Dennedy <dan at dennedy.org> wrote:

> On Fri, Feb 8, 2013 at 6:05 AM, el jefe delito <eljefedelito at gmail.com>
> wrote:
> > 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).
>
> Understandable, but for future reference you can also add the first
> project to the second project as a clip. However, this H.264 profile
> is a very poor choice for this because it is designed for distribution
> not for editing because the GOP size (keyframe interval)) is set to
> 250 frames. At 23.98 fps, that makes the GOP over 10 seconds! That
> will make seeking and thereby a/v sync more challenging. You should
> use lossless for an intermediate file, and they are faster to encode
> as well.
>
> > Ok, so the first output looks great.
>
> Are you referring to just image quality or also A/V sync? Does the A/V
> sync look good in Kdenlive's monitors even after scrubbing or seeking?
>
> >  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
>
> There appears to be a cosmetic bug here. In a fresh project, the first
> time you open the Render dialog it defaults to the HDV group, and
> indeed HDV is not compatible with 720p23.98 (according to MLT and
> Kdenlive). This message should not apply to the H.264 render profile
> as it has no restrictions like that, but I saw the warning as well
> when I used your overlay project. So, there is some state bug that
> makes the render dialog erroneously issue that warning.
>
> > 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.
> >
>
> Based on this info, I do not need the original camera clip because it
> is the render output of the first project that is giving you a
> problem. I have not yet been able to reproduce this. I am not trying
> to use your complex first project because that would take some time to
> recreate with my own assets, and it does not appear to be necessary.
>
> So, I locate a 1280x720 at 23.98 clip in my library, add it a kdenlive
> project with same settings, place it on a track by itself, and render
> it with the H.264 profile. I check the output in a couple of players
> including Shotcut (MLT-based) and Quicktime Player on OS X, both of
> which are playing it with good sync.
>
> I open your overlay kdenlive project and replace the clip that is on a
> track with the output from the preceding step. I render that out using
> the render settings stored in the project file you provided (dual pass
> H.264). The A/V sync of that output is good as well checked using same
> players.
>
> Can you reproduce the problem by simply placing a clip on a timeline
> by itself, rendering that, make a new project, add the rendered clip
> to a timeline by itself, and render that?
> If so, can you reproduce it using one of the binary builds I provided
> to this thread yesterday?
>
>
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-- 

http://tinyurl.com/8zt5jux
e: eljefedelito at gmail.com
t: @robodioxide
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