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IDProjectCategoryView StatusDate SubmittedLast Update
0002875KdenliveRenderingpublic2012-12-16 10:372013-10-25 16:25
Assigned To 
Platform64 bitOSFedoraOS Version17
Product Version0.9.2 
Target VersionFixed in Version 
Summary0002875: Audio out of sync with video when using title clips and rendering H.264 format
DescriptionCreating a video timeline consisting of a 3 second title clip (in this case it's a clip ID number) followed by another 3 second title clip (in this case it's black), and finally followed by five min video all on the same video timeline.

Note the project monitor displays the audio / video sync correctly.

Once rendered the audio starts immediately while the video is 6 seconds out of sync. In my example, I'm rendering roll in clips for a live cable access show. Each clip starts with a 3 second title clip number followed by 3 seconds of black title clip so the control room video switcher / director can start the roll in with a smooth transition from our discussion.

The current work around is to place the video on video line 2 and the title clips on video line 1. I extend the video clip on line 2 to the beginning of the timeline and place a mute audio effect on the first six seconds. It works but it's not pretty

However, this problem only seems to occur when using the MPEG-4 or the H.264 rendering option. I've downloaded custom rendering profiles that are called Custom H.264 1280x720 Normal, HQ Slow, HQ Slower, Lossless slow, and Lossless slower. All of these profiles render correctly without issue and I don't have to "monkey" with the timeline to correct the audio sync issue. Also MPEG2 and HDV formats render correctly.

Update: I created a custom rendering profile based upon the existing H.264 profile, switching the acodec option from "aac" to "mp2". So far so good - it seems to work.

Update: using the mp2 audio codec encoding doesn't work when playing on Windows based systems. Only the aac option works which leaves the messy time line editing method when working with title clips to avoid the audio sync problem

kdenlive: 0.9.3
MLT: 0.8.7

Using the batch script compile option to create a sandbox environment
Steps To ReproduceNote project profile was HD 720p 29.97 fps
All video clips were 1280x720 29.97 with a h.264 encoding.

1. Using video 1 of the time line add a 3 second title clip.
2. Using video 1 of the time line add another 3 second title clip.
3. Add the video of your choice.
4. You will notice the project monitor plays all items correctly. The audio starts in sync with the video.
5. Render your project using either H.264 or MPEG-4 rendering profiles.
6. Your rendered video, the audio will be 6 seconds behind the video. Audio starts playing immediately while the video plays the title clips from the video time line.
Additional InformationCould the problem I'm experiencing be related to an audio codec issue? Should I choose another audio codec? If so which one do you recommend?
TagsNo tags attached.
Build/Install MethodBuild Script
Attached Files

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-  Notes
jeffgerritsen (reporter)
2012-12-19 04:51
edited on: 2012-12-19 04:53

I have rebuilt / recompiled the source code with kdenlive 0.9.3 (rev. 836ab97) as of 1900 PST 12/18/2012, and the problem appears to be resolved - thanks guys.

The version I was having the problem with was kdenlive 0.9.3 (rev. 0c33635).

gowaddle (reporter)
2013-10-25 15:37

Still happening to me on Fedora 19. Sound is fine with mpeg2 and hdv but mp4 and h264 it's off with a title clip. I tried modifying the render profile to add in bframe searching and various other tweaks and can't get the sound to sync. Tried mp4 with aac/mp3 and no joy. One thing I did notice was that changing the project profile to 60 frames a second seems to have fixed it but made rendering a real pain on my comp.

[bmaddox@sdf-1 ~]$ rpm -qi mlt
Name : mlt
Version : 0.8.8
Release : 5.fc19
Architecture: x86_64
Install Date: Fri 12 Jul 2013 09:11:46 AM EDT

[bmaddox@sdf-1 ~]$ rpm -qi kdenlive
Name : kdenlive
Version : 0.9.6
Release : 2.fc19
Architecture: x86_64
Install Date: Fri 12 Jul 2013 09:13:09 AM EDT

[bmaddox@sdf-1 ~]$ rpm -qi ffmpeg
Name : ffmpeg
Version : 1.2.4
Release : 2.fc19
Architecture: x86_64
Install Date: Sat 19 Oct 2013 11:47:56 AM EDT
gowaddle (reporter)
2013-10-25 16:25

So found a cheesy but effective hack to fix it on my system. I created a 5 second audio clip of silence using Audacity. I stick the silence on the audio track in kdenlive under the title clip and it forces the audio back in sync. I haven't tested if I have to do this every time I use a title clip (ie, multiple titles in a video) yet.

- Issue History
Date Modified Username Field Change
2012-12-16 10:37 jeffgerritsen New Issue
2012-12-19 04:51 jeffgerritsen Note Added: 0008833
2012-12-19 04:52 jeffgerritsen Note Edited: 0008833 View Revisions
2012-12-19 04:53 jeffgerritsen Note Edited: 0008833 View Revisions
2013-10-25 15:37 gowaddle Note Added: 0009622
2013-10-25 16:25 gowaddle Note Added: 0009623

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