Audio synch and other probs w/ 2+GB .avi file HELP!!!

[drewson99]

I've been joining .avi files in VirtualDub, and then taking the one long file and re-encoding with TMPEGEnc.

Problem: When the output .avi (from VDub) is over 2GB, the audio goes out of synch. When I try to preview the 2+GB file in Windows Media Player, and use the slider, it immediately says "file type not supported, or some such notice)

If I load it up in my ATI MMC File Player, it allows me to use the slider to scan through the file, but the audio is still messed up.

Its not just a playback issue, I burned the MPEG2 file to DVD and the audio really is out of synch.

WTF?

Andy

Oh Yeah, just in case it is pertinent info:

Athlon XP 1800+
768 MB DDR RAM
80 GB 7200 HD
Win 2000 Pro

[wee haggis]

Before encoding with TMPGE ,extract the audio with Virtualdub and save as a WAV uncompressed (this will be a very large file probably over a gig).Then using the WAV file as the audio source in TMPGE ,encode.
Also,download the lates codecs (perhaps Nimo Codec Pack).
Check options of Win Media Player to see what formats are checked.

[KingJohn]

I've been joining .avi files in VirtualDub, and then taking the one long file and re-encoding with TMPEGEnc.

Sounds like you don't have many keyframes in the AVI, so moving fast forward would be difficult. Why not convert both parts to .mpg then use split/merge in TMPGEnc to join them.

Also you could load each AVI into Vdub, move to the end, mark as end, click back one keyframe and mark as start, then delete. This makes sure the AVI is not cut at delta frames, which could also cause sync problems at the join.

Only good if keyframes are every 10 or so, some have 100 frames !!

[drewson99]

What is a delta cut? and why this 2 GB limit?

Thanks,

Andy

[ejai]

Check out this website, www.Scenalyzer.com. Many people are using it to capture avi video.

This software has a great reputation for recording video with no audio sync problems and no size limit when recording video.

I use to have sync problems, but now I don't. Since I started using Scenalyzer, I haven't had one sync problem.


Ernest

[KingJohn]

What is a delta cut? and why this 2 GB limit?

Thanks,

Andy

A keyframe is a frame that can be decoded on its own; a non-keyframe, or delta frame, is a difference from the previous frame and cannot be decoded if the frame before it is missing. VirtualDub always plays it safe and makes sure that all frames that you don't delete are decodable. This means that any non-keyframe that you include will force inclusion of any frames before it, back to and including the previous keyframe.

position slider and to the right of the motion buttons, there is a timestamp counter that shows the current position:


Notice the [K] at the end -- this is the current frame type. K indicates a keyframe; nothing indicates a delta frame; [D] indicates a dropped frame, which is another type of non-keyframe. Basically, all you have to do is ensure that when you delete a segment, you end the delete right before the next keyframe. You can seek between keyframes by holding SHIFT when dragging the nub or clicking on the forward and backward buttons with the yellow key icon.