The video compression standard (H.264/MPEG-4 AVC) used to encode the file.
Likely a "tag" or watermark from the website where the file was hosted or distributed. p4: Likely a truncated file extension for .mp4 . TheWalkingDeadS03E11HDTVx264-baiscopedownloadscomp4
The source of the video was a High-Definition Television broadcast. The video compression standard (H