Audio 'spike' at join point of 2 merged avi's

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Audio 'spike' at join point of 2 merged avi's

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ATAKorDIE

Newbie

5. August 2004 @ 20:56

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I'm having a recurring problem with several avi's that I encoded earlier this year before I purchased my DVD burner.... I have previously split the files for CD burning use, but now I wish to backup to DVD-R. Now, using virtual dub (or any other avi joining program I can use), I have appended the second half of these avi's to the first half. Individually, both files are completely perfect. After joining, the audio remains sync'd just fine. However, at the exact point where the two avi's were joined, there exists a sound like a loud scratch or screech for a small fraction of a second, then everything is back to normal. These avi's are encoded with multichannel ac3 audio, a few with just stereo ac3. Some of the avi video is xvid, some divx encodes (from even earlier last year, before I discovered xvid). The sound remains in sync, and the video does not skip or anything abnormal.
This sometimes quite loud occurrance is very inopportune, causing the viewer to jump or twitch as a result of it. I'm wondering if there is a way to remove this problem easily without re-encoding as one large file. My codecs are in order, no codec packs or anything, most recent updates and all too. I have formatted both of my systems recently, and this still occurs.

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sandokand

Newbie

18. August 2004 @ 11:16

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I have experienced the same problem. A feasible explanation was given in the following forum: http://forums.divx.com/viewtopic.php?topic=55900&forum=7

They also mention a tool called "Besplit" that should be able to correctly join AC3 streams.

So far, I keep reencoding the AC3-s separately to mp2, and then merging them. Alas, in this way they are no longer multichannel (btw there is a tutorial for producing multichannel mpeg audio streams vor SVCDs, dunno if it works for DVD-R).

I am curious if the problem would persist if one deletes just a couple of frames at the splice point of the .AVI???

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ATAKorDIE

Newbie

22. August 2004 @ 13:46

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Thanks, sandokand, for your reply. As soon as I can find the time, I'll attempt the fix with besplit. I had tried taking out a few frames of AVI at the splice point, but for me, it didn't seem to help.

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ATAKorDIE

Newbie

22. August 2004 @ 17:29

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I used the BeSliced front-end for BeSplit, and it worked perfectly to fix the audio! Just google for besplit or besliced, download and open. Drag the demuxed audio file into the GUI and click Fix File, and it's done. Then remux with AVI. Wish I had known this sooner!! I've found that usually the second half of my encode has the problem audio.

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