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afterdawn.com > forums > archived forums > divx / xvid > audio problem with guides about xvid/vcd conversion
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Audio problem with guides about Xvid/VCD Conversion
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Daeds
Junior Member
_ 		22. March 2004 @ 17:23 _ Link to this message    Send private message to this user   
Hello. I've been trying to get a Xvid movie to SVCD format to view it using my stand-alone DVD player.

I found your brilliant guide:

http://www.afterdawn.com/guides/archive/divx_to_vcd.cfm

used it where I skipped the subtitles and changed references to SVCD PAL instead of VCD PAL.

My problem is that now I got the original video file and the ripped, fixed and converted audio file (originally in ac3, now MPEG2) - and the merged file through TMPGEnc. All using your guide.

They are all 1:08:24 long, I've checked. - But the sound is out of sync throughout the video on the merged one - I've skipped around to check. It starts as a vague at first but is very evident at half way through.

Frame Rate is 25fps - and the comp. running the show is a:
Athlon 2500XP
512 MB PC3200 400Mhz RAM
ASUS A7N8X Deluxe 400Mhz FSB Motherboard
GeForce2 GTS Video Card
InterVideo WinDVD (bought three months ago)

The Comp has NEVER had problems playing videos be they DVD,VCD or SVCD - untill now.

What could be the cause of my Audio Problem - and waht can fix it?

Please Help.
[ + quote]
"I do not suffer from Insanity, I enjoy every minute of it."

Daedalus. Ruler of the Universe and part-time tape measurer

This message has been edited since posting. Last time this message was edited on 23. March 2004 @ 05:29
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Daeds
Junior Member
_ 		23. March 2004 @ 03:18 _ Link to this message    Send private message to this user   
Incidentally I've found an error in the guide - but not one that should cause my problem.

You call for users to open ViruaDubMod and click the "Audio" menu to strip the sound.

That menu does not appear in the Modified one - but if you use the normal VirtuaDub then it exists and you can proceed
[ + quote]
"I do not suffer from Insanity, I enjoy every minute of it."

Daedalus. Ruler of the Universe and part-time tape measurer
whassup
Member
_ 		26. March 2004 @ 12:52 _ Link to this message    Send private message to this user   
I think I know what file you're talking about. Does it also happen to be encoded in AC3? ;-)

Anyways, it drove me crazy. I tried using a multitude of encoders, tried extracting the wav, tried encoding the audio only and then muxing them, etc, etc.

In the end, I just used ProCoder and the sync issues were gone. (whether I used 25 fps or 29.97 fps)
[ + quote]

This message has been edited since posting. Last time this message was edited on 26. March 2004 @ 12:54
The_OGS
Senior Member
_ 		29. March 2004 @ 06:01 _ Link to this message    Send private message to this user   
Daeds,
Been there! Audio encoders are 'lazy' and well known to speed up and slow down imperceptibly. This WILL be perceived, unfortunately, when a synch issue involves video. If the video is wandering a bit also, then you are seeing the sum of all discrepancies and it is readily apparent to you. Also, the quality of your source XviD is not guaranteed. Is it well synched?
I can only suggest taking the original AC3 sound and decompress it into a WAV using the AZID function of BeSweet. (For 1:08 the resulting file could be almost 1GB.)
Then let TMPGEnc encode the video and this audio (using its own built-in MPG2 encoder) whilst crossing your fingers...
And do your self a favour - go into your BIOS and set your memory to run at 333MHz 1:1 (or sometimes described 5:5) synchronously. You would benefit from 400MHz only if you had a 3200+ Barton @200MHz DDR.
Regards
[ + quote]
ABit AB9 Pro
Intel Core 2 Duo E6420 @ 2.4GHz
2GB OCZ PC2-6400 Platinum XTC R2
ATI Radeon X1900XT 512MB
Enermax Liberty 620W
320GB/16MB WD, 150GB/16MB Raptor
Plextor PX-755SA DVD (SATA)
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Daeds
Junior Member
_ 		29. March 2004 @ 13:47 _ Link to this message    Send private message to this user   
WEll I've fixed the problem. Thank God.

Ended up using a little program called "Decompress.exe" to convert the AC3 audio to uncompressed audio.

Then fiddled for a while trying to get the aspect ratio right when burned and played. Damn silly 640x256 - made hell whenever I played it using standard template conversion to SVCD - had to set it individually.

I am using 3200+ Barton RAM with 400 MhZ BUS speed. So I'm running a 400MhZ FSB across the board - made for a damn increase in speed. Gotta get m,e one more block for Dual-Ram Speed. Even faster:)

Xvid to VCD in near real-time speed. Gotta love that ;)
[ + quote]
"I do not suffer from Insanity, I enjoy every minute of it."

Daedalus. Ruler of the Universe and part-time tape measurer
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