solved Audio Video Alignment issue on Export

[John H.]

I have a 1/2 hr video taken on an IPad Pro (with high efficiency encoding enabled) that I would like to edit with VideoPad to speed it up by 4%.  Unfortunately, the video and audio drift on export.   Plays fine within the software prior to export.   I’ve tried converting it to a constant 30fs frame rate first before speeding it up reexporting and does not help.  Ideas?

[borate]

What version of Videopad is being used?

Two things to try.  When changing the speed, UNcheck the "keep pitch unchanged" box.

When exporting, test both the AVI and mp4 formats.   Report back.

[John H.]

I have the latest version, 8.63.  Have not tried what you suggest yet.  I will do so and report back results when finished, along with that of some other tests that I’ve performed.  Thanks for the quick response.

[John H.]

Here's what I've learned so far:

Version used: v.8.63 VideoPad (on Windows 8.1, upgrading it to 10 is not an option)

- Within VideoPad, before export,  the playback works as desired (both time reduction and corrected pitch preview together correctly).

- Exporting the video with "keep pitch unchanged" box UNchecked properly exports time aligned video and audio (mp4/720p preset for YouTube tested) but speaker voice sounds like daffy duck (as expected).   Unfortunately, I really need both features to work (pitch corrected and 4% reduced time).

- Exporting to AVI format with various quality/encodng settings does not resolve the issue

- Exporting as MP4 (h264, h265, MPEG using various video and audio settings) does not resolve the issue.  Neither does . MOV or .SWF.   I tried numerous configuations, at various quality settings, and all experienced audio drift problem.

-  In another experiment,  I converted the original iPAD .mov file to constant 30fs .mp4/h.264 using another tool, then split the audio and video into separate files/tracks using FFMPEG and then re-imported them into Video Pad each as a separate file  (not just unlinking them from the original native to VideoPad).  Still has a problem on export.

- Manual alignment is not an option within VideoPad because the audio/video appear correct within the software (both in wave form, video track and on playback).  There's nothing obvious for me try and manually adjust and on the wrongly created ones, the audio is truncated.

** In summary, the only positive change in behavior occurs when UNchecking "keep pitch unchanged."   This produces properly time-aligned video, reduced by 4% (as I have set in the software).    Unfortunately, the speaker is unatural enough that it is not acceptable for my use.   The voice (and timing) within the software before export is what is desired as the previewed pitch/sounds is not as noticably impacted with "keep pitch unchanged" selected.

Thanks for your help.  

[borate]

This is a known issue, but there may be a workaround.  Share the project (not the export) here or in private and we'll analyse it.  This is an easy four-step process...

1. With your project on the timeline, click the 3-lined 'hamburger' menu, top-left.  Click FILE | BACK UP PROJECT FILES TO FOLDER.  Specify a folder.  Click SELECT FOLDER.
2.  Using the PC file manager, go to where the numbered folder was saved and upload it to a free server - Google Drive, MS OneDrive, etc.*
3.  Get a shared, public, non-restricted link.
4.  Paste that link here, or click the folder, above top-right in this forum, and message it to me.  This is private and won't be shared.
*    Before uploading, right-click the folder, click PROPERTIES.  Look at the File Size to confirm that it's not too big for the free space on the server.

RESOLVED via personal messaging.