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AVI Audio out of Sync on Series 7

by lottamog / September 1, 2009 5:52 PM PDT

Hello,
I have tried to play a few avi's and found that there have been audio sync problems on the TV but when I play on the computer it is fine. How can I fix this?

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Re: avi audio out of sync
by Kees Bakker / September 1, 2009 6:04 PM PDT

What program do you use to play it on the computer?
What codec is being used?
Where did you get the avi's from? If you downloaded them, do you have a download link so the Samsung tech can try it on his Samsung TV?

Kees

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Re: avi audio out of sync
by lottamog / September 2, 2009 3:55 PM PDT

Hi Kees,
I am using Windows media player with Divx codec on my computer.
The Series 7 has an inbuilt Codec so really just a plug & play on the TV side of things. To be honest I am not too savvy on avi details or codecs so should I be upgrading the firmware etc if it is a codec mismatch?

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Re: avi audio out of sync
by Samsung_HD_Tech Samsung staff / September 3, 2009 6:09 AM PDT

lottamog,

That wouldn't be a codec issue within the television, it would more reflect on how the container was encoded. There aren't any updates to the firmware that I'm aware of that adds any codec or improves internal codec functionality.

There's a match up of all the supported codecs here:
http://i397.photobucket.com/albums/pp60/samsung_hd_tech/DLNA7000.jpg

While other configurations may or may not work, these are the ones we know that will.

--HDTech

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Re: avi audio out of sync
by lottamog / September 3, 2009 9:46 AM PDT

Thanks for the info HD Tech.
I will try other Avi's I have and see if I continue to have the same problem.I have tried 4 avi's and I'm about 2 for 4 in strike rate.


LM

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Is it really the codec? The when is an update coming.
by puzzledbytv / November 20, 2011 6:41 AM PST

Up until recently I have had no problems whatsoever to watch avi files. Always in sync and amazing picture quality. So why is this suddenly happening and not on all files? If you believe this is a codec issue then I would hope that Samsung is coming with a firmware update that keeps up with the latest codec version being used.


I've loved my TV until now, but now I'm really starting to get impatient with this. When can we expect a firmware update for UE40B7070?

Thanks.

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"That wouldn't be a codec issue within the television, it
by R. Proffitt Forum moderator / November 20, 2011 6:44 AM PST

"That wouldn't be a codec issue within the television, it would more
reflect on how the container was encoded. There aren't any updates to
the firmware that I'm aware of that adds any codec or improves internal
codec functionality."

To rephrase, there have been few to no updates for this area. If there are play issues you are left to re-encode the content in whatever works.
Bob

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I feel you brother!
by gewone / August 10, 2010 8:18 AM PDT

I think it's an issue with the playback engine. I have an LE40B655 that tend to show similar audio gasps. It's not the AVI files. I've actually ripped a couple of DVD's myself. Latest stable LAME for VBR MP3 audio, latest stable Xvid MPEG-4 ASP for video, and final mux made with latest VDubMod, which is also more or less de facto standard.

On computer these files play fine, but when played over USB stick / external HDD through the television, it's another story. Most of the times, they play fine, but still, issues may occur.

I'm pretty convinced that it has something to do with the "interleaving" that AVI files audio/video tracks are based on. Somehow one or more interleave phases are lost in translation, or something like that. I've actually managed to "reattach" the sync by fast forward/rewind-ing just a little bit.

I also have a cheap(!) stand-alone player which handles AVI (only). After pressing play on a 700MB AVI file it will start some sort of pre-load, with a hourglass symbol showing for a couple of minutes, before the playback starts.

I guess/assume(!) that this machine is pre-rendering slash indexing the entire file before playback starts, hence the delay. However, I've never(!) experienced audio sync issues on AVI files with this garbage(!) stand-alone. On my Samsung television set, there is hardly any delay for playback to start, a second or so, tops. Supposedly, Samsung tv sets do interleaving / indexing like more of a "on the fly" event, hence the possibility for errors.

Guess we'll have to suffice for better or worse, or perhaps hope for someone from the Samsung tech group to stumble through this thread, realize facts, and throw us a decent f/w upgrade.

Let's hope! Happy

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An audio bit rate issue?
by bspisak / October 28, 2011 1:46 PM PDT
In reply to: I feel you brother!

I've noticed audio sync issues with some avi files. It must be that some audio bit rates are not properly supported. In some cases, it's fairly obvious right from the beginning, but it always gets progressively worse as the video continues. In other cases, I've only noticed towards the end of an hour long segment. It's like the audio is encoded at 127k and is being played back at 128k so that there's just enough of a drift that given enough time, it eventually gets out of sync. In the more severe cases, it's like it's encoded at 123k. If I recode the audio, fixes the problem.

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