Having the same problem with alpha 3 version where system error is prompted – “The program can’t start because gstreamer-1.0-0.dll is missing from your computer. Try reinstalling the program to fix this problem.” – when I start the program. I did a fresh reinstall and did again install after separately installing gstreamer1.0.dll first but the error still showed up both the times. After reading this thread I installed alpha 3.1 version but the error still exists. My system is running Windows 8.1.
For now reverted back to using the previous release.