Video read fix

[prouast]

• When reading videos with issues that return unexpected number of frames, automatically pad or trim the result
• If video read is not possible without missing many frames, raise error
• Support both global and non-global video parsing
• Check videos for issues before parsing
• Check if parsed videos will fit in memory if globally parsing
• Check if face movement is an issue for global parsing
• Choose whether to parse globally based on the above factors