MP4 is just a container; it can hold video encoded with H.264, H.265 (HEVC), or even old MPEG-4. If "TASO 07" used a modern codec (like H.265) to compress the video for high quality at low size, but your media player only supports H.264, the file will not "work."
Because it contains specific codes like "ss taso 07" and "ac," this could refer to a few different things. While I'm answering based on the most likely intent—that this is a request for information on a specific digital artifact or viral clip—it could also be a piece of obscure technical documentation or a niche internet meme reference. Based on the structure, ss taso 07 ac merry christmas mp4 work