1b4a1668c0.480.avi.mp4

: This "double extension" suggests a format conversion . The file likely started as an .avi (Audio Video Interleave) file and was later converted into an .mp4 (MPEG-4 Part 14). ⚙️ The Conversion: AVI to MP4

Are you trying to with this specific naming convention? 1b4a1668c0.480.avi.mp4

An industry standard used globally for web and mobile. : This "double extension" suggests a format conversion

: This indicates the vertical resolution (480p), commonly known as Standard Definition (SD). It suggests the file was optimized for a balance between clarity and small file size. 1b4a1668c0.480.avi.mp4