I edited a film in Premiere Pro CC and exported the audio and video (at the same time) as H.264 Blu Ray and AC3 audio. When I imported these files into Encore CS6 to author the Blu Ray disc, the .m4v video file is slightly shorter than the film in the actual project, resulting in audio that is syncronized at the beginning of the film, but gets progressively worse and is ultimately out of sync by about 10 seconds at the end of the film. As you can see in the screenshot below, the film is 03:49:34:01 in length, but in Encore CS6 it's saying 03:49:25:10. The AC3 audio file is the correct length in Encore. The footage is all 23.976fps captured from Canon 5D Mark II cameras set to 24p. When I had dynamic link, this all worked perfectly and I never had issues with it. Am I missing something?
Previously, I was able to successfully author a DVD from the same film with no audio sync issues.