System Information
Operating system: Windows 10
Graphics card: GTX 1060

Blender Version
Blender 2.80 Hash: 60b930af3e73 Date: 2018-12-25 - 16:36

Short description of error

When I render an scene of 1200 frames with this output (AVI raw), it's giving me a rendered video that contains aproximatedly the 50% of the animation time it should have (I am rendering 1200 frames, and when Blender is making the render it goes and shows 1200 frames rendered in the end, BUT... when I play the rendered video it only lasts until frame 550 so so.

To resume, an incomplete render.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).