You are messing up your framerates. Check your footage interpretation, comp settings and render settings under that aspect.
Ok makes sense, but I'm still running into issues.
My comp has a main video at 13fps, so I set my composition to a frame rate of 13.
I have set all other video files to framerate of 13 (the originals are 30fps). There is no such settings for the audio file. In the render queue, I also checked that its at 13fps.
Am I correct so far?
It seems like the audio is now kicking in at the correct time, but the video layer at that point is off: The composition is exactly 4minutes long, with the last clip ending at 4.0mins. But when I render, the video is 4min8sec long, and the last clip is pushed out (ending at 4min8sec).
I think for now, *maybe* I will render the video as best I can, and then add in the audio after...
Is it possible that because I created my composition before setting the framerate, that some of the layers are not updating to the new frame rate? I don't want to start deleting and re-adding because I have quite a large project. I'll be more careful in future
You will have to check the timebase in the project settings. Such odd framerates are not part of any SMPTE or other professional video and fim standards, so calculations may not be frame exact. Audio is calculated based on the files sample rate, so if it's an odd rate, there may be variations since samples will be quantized to whole frames. That could also be true for the video. Especially screen captures may use fractional framerates due to the performance and settings of the system they were captured on, but sell them as full frame rates. That's worth looking into as well and could explain your timing discrepancies.
Verry good insight. The file was a screen capture (recorded in FLASH) and although it says the framerate is 13, its actual rate is 12.5! I am using BB FlashBack Express Recorder which is great, but has little options.
Thanks a mill for your help Mylenium!