audio synch problems with joining two part avi

[Lynxer]

I have been joining avi's and converting to dvd no probs until now. I have this avi film in two parts however when I try and join them using Vdub the audio goes right out of synch in the second half even though avi part two is in synch is there anything I can do it is driving me crazy.

Please help

Many thanx

[dafreak]

is it a gradual loss or it a set amount of loss

[ZippyP.]

Are you making a DVD? If so, then just make two mpegs and author them together onto one disk. There will be a slight pause between tracks.

[Lynxer]

is it a gradual loss or it a set amount of loss

A set amount from the point of the join of the second avi.

[Lynxer]

thanx ZippyP. I have already tried this but the pause is quite noticeable in the middle of a film.

Any other ideas??

Cheers

[Suntan]

Join the 2 video streams together, then load the 2 audio streams into Audacity and cut/splice the audio around the point of the transition so that the audio matches the video. Match the timestamp of the audio to the timestamp of the video at a notable part (i.e. a gunshot) Then mux the audio and video together.

-Suntan

[Lynxer]

I don't want to appear dumb or be a pain in the **** but I need more detail. If you have the time I would really appreciate a more indepth guide to using Audacity. I joined the avi's together using Vdub and then saved the audio as a wav file and then loaded this into Audacity but all I seem to be able to get is a squeeky noise. Am I on the right tracks or completely wrong??

Any guidance would be greatly appreciated

Cheers guys

[Suntan]

Are you sure you have a ligitimite .WAV file? (I haven't every really needed to deal with demuxing avi's as I always start with my DVDs so I am not overly familiar with vdubs demux capabilities) Open the WAV file in a regular player (like winamp, or zoomplayer) and make sure that it plays alright and it shows that it is acually a wav file and not a different format that just had its extension changed to .WAV. If it plays in a player then it should work without hassle in Audacity.

Audacity's help index is HERE. I really don't use it all that much so I can't really give good help with it.

Did you try Import RAW Data? It might work.

-Suntan

[Laddydaddy]

lynxer

What kind of audio is contained in the original avi files. ac3, vbr, etc?

[cd090580]

You can encode each part to mpeg individually. After encoding join the 2 mpeg files with tmpgenc->Mpeg Tools->Cut Join.

[Lynxer]

Laddydaddy

AC3 audio - does this make a difference??

[Laddydaddy]

Lynxer wrote;

AC3 audio - does this make a difference??

I believe so. First you need t download the AC3 ACM decompressor from the tools section and install it. Then load your first avi into VDub and choose audio>full processing mode. Then audio>compression_ac3 acm decompressor. Then file>save wav. You will now get an uncompressed wav file. With the original avi still loaded in Vdub choose audio>wav audio. and navigate to the wav file you just created and load it. Then choose audio>direct stream copy, video>direct stream copy, and finally file>save as avi. You will now have a new avi file which contains the wav file you created. Repeat the process for the other avi file. Load your 2 NEW avi files into VDub and see if the A/V is still out of sync.

[Lynxer]

Laddydaddy - that worked FANTASTIC thanx very very much.

However I now have another avi with an audio which is Fraunhofer IIS MPEG Layer-3 (whatever that means), and the same thing is happening. Can you work your magic again?? Pleeeeeease???

Many thanx.

[Abond]

That means you have mp3 audio compressed with Fraunhofer mp3 codec. Repeat the procedure above, skipping "audio>compression_ac3 acm decompressor" step. Well, good luck.

[chanchan]

Hi. I've also had trouble before with joining .avi's together and having out of sync audio after it's reached the part where the two .avi's were joined. Currently I have two files with .ac3 audio I'm trying to join. I tried Laddydaddy's method and downloaded and installed AC3 ACM decompressor. I load in my avi and set the audio to 'full processing mode' then I go to compression and set it to 'ac3 acm decompressor'. When I try to save it as a .wav file as soon as I hit the save button I get this error message, "Error initializing audio stream compression: The requested conversion is not possible." Can anybody help me and tell me what I might be doing wrong or what I can do to fix this? Any help would be appreciated.

[Lynxer]

Hi again,

I have followed the instructions given before and up until now they have worked great. However, i now have come across another problem. Again I have a two part avi but when i try to load them into Vdub i get a message saying audio samples differ. I decompress the audio and resave the avis. I can then join them in Vdub BUT when I replay the whole file it goes out of synch from the point of the join. Any ideas.

Many thanx