Different video encoders certainly produce different outputs. Even the same video encoders produce different outputs. Here is a good paper that explains why tha

Different video encoders certainly produce different outputs. Even the same video encoders produce different outputs. Here is a good paper that explains why that is, and talks about how to make a deterministic video h264 encoder: http://www.ndsl.kaist.edu/~kyoungsoo/papers/mmsys14.pdf http://www.ndsl.kaist.edu/~kyoungsoo/papers/mmsys14.pdf