**System Information**
Win7/64, GTX 750 Ti
**Blender Version**
2.72
**Short description of error**
see title
**Exact steps for others to reproduce the error**
# Set the scene's size to 1280x720.
# In the VSE, add a video strip with a size greater than 1280x720, and the aspect ratio is not 16:9, for example 1728x1080.
# To prevent Blender from chaging the video strip's aspect ratio, enable the video strip's "Image offset" property (in the "strip input" panel)
# Add a tranform effect strip to the video strip and scale to 0.5. The problem is: The scaled image is cropped even though the final image after applying all effect strips would fit into the render target.