Microsoft Windows 8.1 (6.3.9600), 6GB RAM, x64 AMD A6-5200 APU w/ Radeon 8400 R3 series (512mb) Driver ver: 7.1.542.0
Short description of error
When using the Video Editing to rejoin a 20 FPS WMV to its (modified) sound, it syncs up during playback in the editor but always goes out of sync in the final output (H.264/AAC, OggTheora/Vorbis, mpeg, etc.) after a short time (if it was ever in sync to begin with).
I have tried everything... And by that I mean different combinations of settings & codecs, all at the 20 FPS... including importing the video and audio before/after frame rate change... And yes, also the various sync settings (I have zero problem syncing in the editor, only final output).
The only thing that seemed to get around the final output's A/V sync problem was pre-converting my source video to 29.97 FPS. Only then did the issue (completely) disappear. If nothing else, a simple warning informing the user that they are about to blow an entire day, by trying to save a few frames, would be nice =]
Exact steps for others to reproduce the error
- Open Blender 2.76b and choose "Video Editing" for "Screen Layout".
- Set FPS to Custom -> 20.
- Add a video file and an audio file that are to remain in sync, together, for the duration (~1min.)
- Play the project in the editor and notice that the audio & video remain in sync for the entire duration.
- [CTRL]+[F12] to "Render Animation" (or just use the big button in Render properties). -> Out of sync!