Video not in sync with Timeline - iOS Player especially bad
I am developing a suite of courses that rely heavily on short video clips shot on a green-screen then saved as FLV and imported into Articulate Storyline. We have tried to play around with different rendering sizes with the video minimise loading time, however we are running into other issues because of the video not being in sync with the rest of the timeline.
1. Is it possible to set a screen's timeline to pause and only proceed if the video is buffered / loaded?
2. iOS Storyline player looks good at first sight with alpha channel layers keyed out nicely, however the video is very jolted, only one frame of video to every 10 or so frames. The audio is smooth though and does not jolt. What is happening? Can it be fixed?
3. From others' experience using alpha channel keyed video clips, what are the ideal render settings to minimise lag?
Thanks in advance for your response.