There are 8 characters which filename can obtain

The length of a file name is generally limited by the combination of OS and filesystem.

Most common configurations:

Windows XP/7 on NTFS has a max path+filename+ext (yes, full path and filename combined) length of 260. Path and folder take a minimum of 3 characters ("C:"), so you are left with effectively 257.

Windows 98/95/3.x/DOS on FAT32 had max filename+ext length of 8+3.

Most Linux/Unix filesystems have max filename+ext length of 255

What is in it.

songs are usually in mp3 format or mpeg 3 and videos are AVI wav and mp4

8.3 file name i.e. <8 characters fo filename>.<3 chars for extension> But U can not use special characters in file name as \ / : * ? " < > |