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Virtualdub audio sync - VideoHelp Forum
https://forum.videohelp.com/threads/366739-Virtualdub-audio-sync#:~:text=So%20you%20go%20the%20VirtualDub%20normal%20Mode%2C%20open,the%20original%20but%20audio%20and%20video%20are%20synchronized.
Audio sync issue, Virtualdub, old video clips changing ...
https://forum.videohelp.com/threads/339066-Audio-sync-issue-Virtualdub-old-video-clips-changing-frame-rate
I tried using Video -> Direct Stream Copy and Audio -> Direct Stream Copy and Video -> Frame Rate -> Change Frame Rate to 29.97 fps on each file. This worked, but the audio was out of sync. So then I tried the previous options except I changed Video -> Full Processing and Audio -> Full Processing.
How To Change A Video's Speed With VirtualDub - …
https://www.ghacks.net/2011/06/26/how-to-change-a-videos-speed-with-virtualdub/
Start the software and load your video, or videos, with a click on File > Open Video File, and File > Append Avi Segment. Please note that changing the speed of a video has an effect on the audio. The audio will get out of sync, and it is usually the best option to replace the audio afterwards with a new track.
Dialogs: Video frame rate control - VirtualDub Documentation
https://documentation.help/VirtualDub/d-videoframerate.html
Adjusting frame rate. If the source video has the wrong frame rate or doesn't natively have a frame rate (image sequence), you can specify one in the source correction portion of the dialog. You can either type in a rate, or have VirtualDub automatically choose a "same length" setting, such that the video and audio tracks end at the same time.
AVI timing and audio sync - virtualdub.org
https://www.virtualdub.org/blog2/entry_027.html
Thus, to encode VBR MP3, you simply have to set nBlockAlign to at least 960, the maximum frame size for MPEG layer III, and then store each MPEG audio frame in its own chunk. Since each audio frame encodes a constant amount of audio data -- 1152 samples for 32KHz or higher, 576 samples for 24Khz or lower -- this permits proper timing and seeking despite the variable bitrate.
Capturing with VirtualDub [Settings Guide] - digitalFAQ Forum
http://www.digitalfaq.com/forum/video-capture/7427-capturing-virtualdub-settings.html
For one, I've never had to readjust audio sync with the default settings, even if I had to change frame rate (such as going from 29.97 to 23.976 film speed) . If you're doing some kind of special re-sync after capture, it's something you should test beforehand.
VirtualDub documentation: Capture - virtualdub.org
https://www.virtualdub.org/docs_capture.html
The "lock video stream to audio stream" option in settings only works for compatibility mode; it sets the frame rate of the video stream so that it's the same length in time as the audio one. This is a nasty way to get audio in sync, because it will make editing harder -- to coerce the clips to a single frame rate for rendering, frames will have to be dropped or duplicated.
Capture timing and capture sync - virtualdub.org
https://virtualdub.org/blog2/entry_078.html
As an example, have VirtualDub process a video in Direct Stream Copy mode with it set to convert to a 120fps frame rate. You'll find that about three-quarters of the frames in the output file are pad frames (zero-byte), but audio sync will be preserved.
Capturing Video with VirtualDub
https://lparchive.org/meatsupport/CapturingVideoWithVirtualDub/
Check off video -> stretch to window to do that. Frame rate and audio rates are in the lower right corner. Usually you want to capture at 30 fps unless you think your computer is cool enough to handle 60 fps. Audio should always be 44/16/stereo. Now go to capture -> timing and make it look like this: . That should make your audio sync up.
slow motion with virtualdub? | AfterDawn Discussion Forums
https://forums.afterdawn.com/threads/slow-motion-with-virtualdub.625116/
Click on 'Stretch' and enter '2', click on 'Ratty' and enter '2' - don't forget to compress the audio, save the new AVI and importantly, reset the video frame rate and turn off the advanced filter. Clear the edit point again and select the third part, recompress the audio, and video direct stream copy and save it. Close and reopen VirtualDub.
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