I have faced a strange issue of syncing video action with audio. I am working in a Project. The entire project is of 4787 frames (Start frame 2154 and End frame 7150). There are numbers of audio files and connected lip synch & actions were prepared. Before putting the file in image sequence rendering, everything was checked (including fps) and all Audio- Video syncing were fine. However, after finishing the image rendering of 4787 nos. of images, and also finishing final video rendering, it is found that the audio and video are not synced. While examining it is found that every audio files in VSE are scaled down from their respective start frame. The Screenshot may please be seen. In the screenshot, previously, the audio file ‘X’ and NLA strip ‘Y’ were perfect paired. However, it can be seen now that the audio file ‘X’ start frame is 2157 and the end frame is 2323 but the lip sync audio strip ‘Y’ start frame is 2157 and the end frame is 2363. There are total 18 nos. of audio files and NLA strips. For each of the audio file and NLA strips start frame is same but somehow audio files are scaled down. Because Camera marker ‘Z’ and NLA strips ‘Y’ are matched, only the audio file ‘X’ is somehow scaled down for each NLA action. If I replace the audio file ‘X’ from the original audio file saved in my PC, the length of audio file is unchanged.