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[bmaseda]

When bringing video with audio into Flash MX, the audio goes out of sync with the video. We have imported an 80 second .mov compressed with Sorensen 3 and aLaw 2:1 mono. When played back in the Flashplayer, by the middle of the interview video, the lips are out of sync by a few frames. When published into a projector, it goes out of sync by a few tenths of a second. On the Windows 2000 system we have 512 mb RAM, so it only goes out of sync a few frames. When played on a Win 98 system with 128mb ram, the sync is worse. What do we do?

We are not trying to make a Jacky Chan flick.

Please Help!

[oldnewbie]

Framerate of the video the same as your Flash movie?

[marathon332]

Not sure about MX, but sound and animation in Flash 5 had to be synced to 12 FPS....

Try that and see how it works...

[bwat]

Take a look at this thread:

http://board.flashkit.com/board/show...9&pagenumber=1

There is a lot of really good information regarding this problem.

Good luck!

[bmaseda]

thanks for the thread. Looks like we will continue to use SWF studio for video till MM gets the audio/video synching fixed.

[sapro]

I found another solution. Squeeze the video without sound, and import the audio seperately, setting it to streaming to keep it in sync. More about how I did that here:

http://board.flashkit.com/board/show...hreadid=303959

[Jonathan_B]

Hi.
You may want to check out our Flash video encoder, Flix, which offers excellent audio sync.
It outputs both the new MX/FLV video files as well as the older Flash 3-5 output. And it has many, many other great features.
There are free demos for both Win and Mac available.
jb
http://www.wildform.com

[Kennyb]

I've wrestled with audio/video synching and have learned a few things.

1. Flix Pro really does help. It solved 95% of my synch problems. Previously, I became accustomed to importing Windows media format into Flash MX and found all the synch problems soon enough. I got Flix Pro and had it encode my raw files (not the compressed wmv’s) out to FLV format. I imported this into MX, and it worked just like that nearly every time.

2. On two files working as above, I did have problems – although they were much less severe than before. I found that if I rendered to a SWF from Flix, and did a loadmovie, I didn’t have a synch problem. So, I saw that the problem was following MX and not the Flix encoding.

3. However, I had a template setup for placing imported video files and wanted to see if I could get it to work per the method already mention on this thread. In other words, separating audio and video. This worked great. I exported video only from Flix into a FLV and the exported my Audio-only out of my video editing software (Ulead MediaStudio Pro). I placed each on its own layer, set the audio to streaming and rendered the SWF. It worked perfectly.

[Jonathan_B]

Hi.
Kenny, FYI, Flix will also output a .wav and/or .mp3 of your audio track along with the video swf if that's the route you want to go.
jb
http://www.wildform.com

[Kennyb]

Cool. One thing you might want to do, then...

When I have the Encode menu open, I'm accustomed to selecting FLV and keeping "Export Video" and "Export Audio" selected. I tried just unselecting "Export Video" and leaving “Export Audio” selected - thinking that perhaps I'd get an audio-only FLV.

Of course, it didn't work. I got an FLV file that would not import into MX. In hind sight, FLV is a video format (FLash Video) and I should have known better.

My point is that – Perhaps “Export Audio” should gray out in the Flix menu as an option when the output file name is filename.flv.

No big deal really, but would keep people like me from trying silly things.

[Jonathan_B]

Hi.
Yes, that's true. But if you want just the audio, you can create a .wav or .mp3 file and import those. There really is no point to having an audio only FLV file since that is the same thing as importing the .wav file.
jb

[Kennyb]

Yes, thanks. I fully understand that now. I was just making a usability suggestion.

[whiterabbit]

Originally posted by bmaseda
When bringing video with audio into Flash MX, the audio goes out of sync with the video. We have imported an 80 second .mov compressed with Sorensen 3 and aLaw 2:1 mono. When played back in the Flashplayer, by the middle of the interview video, the lips are out of sync by a few frames. When published into a projector, it goes out of sync by a few tenths of a second. On the Windows 2000 system we have 512 mb RAM, so it only goes out of sync a few frames. When played on a Win 98 system with 128mb ram, the sync is worse. What do we do?

We are not trying to make a Jacky Chan flick.

Please Help!

This is probably not a ram issue as much as a processor power or graphics card issue. I am surprised that you are experiencing this as I thought that true time based video playing back in a DV codec would have eliminated that problem. I guess player 6 doesn't quite pull it off.

We specialize in SV simulated video. In our experiments which led to the writing of THE SV BIBLE and Production of SWF Optimizer, a software that reclaims ram as video plays, a big problem was with Flash and slower computers and the loss of lip synch.

In SV with 320 x 240 resolutions you would need at least a 300 mhz processor to keep up. I am curious to know what size video your encoding and at what frame rate.

Another for sure way to lose synch in SV (as mentioned already) is using different frame rates for flash and video. Flash is frame based so in SV you would add streaming sound to convert to time based which would force dropping of frames if need be to keep up. Still if your computer had a slow processor or very little graphics power a slight lag in video would occur.

I thought this problem would be resolved with mx. Please let me know the details as mentioned resolution of video and fps and what size your encoding at. I would like to do some tests.

Thanks,

Jorge Pease
Manta Productions.com, inc.

[Kennyb]

I render video on two different computers:

One is a Dell 700 mhz with 256 MB RAM and a 32 Mb AGP graphics card, and a 7200, 60 GB hd. The other is a 900 mhz pc with 256 MB RAM, 30 GB SCSI HD, 32 MB AGP video. I don't think I have a resource or horsepower issue.

I create all of my video at 320 x 240, 30 fps for web and cd-rom production.

Flash MX has an option upon video import to "Synchronize video to Macromedia Flash Document frame rate." I always check this box. Sometimes it works and sometimes it doesn't.

[whiterabbit]

Okay, it doesnt sound yoy have a horsepower problem but to make sure have you tried cutting back to 15fps. Might reveal something. I had a friend with a more powerfull machine than mentioned that was having problems with a 1.2Mbps stream.

Good luck with your situation. I will be doing some testing myself.

JP

[Kennyb]

When I synch with Flash, I should be down to 12 fps.

Let us know if you find something out because there is certainly a growing chorus of discontent with MX video and audio synching. Workarounds exists, but one shouldn't have to work this hard to get it right.