TFRA boxes are useful for finding out which fragment box (MOOF and MDAT) corresponds to a start time offset. The attached patch implements the "reading" part of TFRA box.

I didn't need the "writing" part and it's not implemented.

Thank you very much for your contribution! Code looks very nice!

I will commit this into subversion once I get the writing part done.

OK, fixed now and moved to trunk. You could also test the write part whether it works as expected. I didn't have any test files with TFRA box.