AVI file header 'file-size' field not matching the actual size of the file

StackOverflow https://stackoverflow.com/questions/13682868

  •  04-12-2021
  •  | 
  •  

Question

Ok so I am currently trying to make an avi from a set of bitmaps.
So I popped open a sample avi file in a hex editor to check things out. It starts out right with "RIFF". The next four bytes represent the file size: which i got "40 6A EA 00" in HEX. Now this translates to 1080748544 in decimal and some 128 MB. But the file is actaully just 15 MB.
What gives?

Digvijay

Was it helpful?

Solution

Haha ok, I got the answer. Basically the file size was given in little endian format, and hence i was calculating the wrong size.
"40 6A EA 00" does translate to 128 MB. However "00 EA 6A 40"(Where EA is the most significant byte) does actually come out to about 15 MB

Digvijay

Licensed under: CC-BY-SA with attribution
Not affiliated with StackOverflow
scroll top