function verifyMP4(fileBuffer) if (fileBuffer.length < 12) return false; // ftyp box size (4 bytes) + 'ftyp' (4 bytes) + minor version + brand return fileBuffer[4] === 0x66 && fileBuffer[5] === 0x74 && fileBuffer[6] === 0x79 && fileBuffer[7] === 0x70;
The phrase is likely a Google Dork , which is a specific search string used to find publicly accessible web directories containing video files. indexof mp4 verified