step #1:
see normal .3gp (written by your MediaRecorder) file header, for
instance:
# hexdump -C normal_file.3gp | less
00000000 0000001c66747970 3367703400000300 |....ftyp3gp4....|
00000010 336770346d703431 336770360007a42f |3gp4mp413gp6.../|
00000020 6d6461743c911716 be6679e1e001e7af |mdat<....fy.....|
step #2: compare it to the file written by your server:
# hexdump -C server_file.3gp | less
00000000 0000000000000000 0000000000000000 |................|
00000010 0000000000000000 0000000000000008 |................|
00000020 6d6461743c911716 be6679e1e001e7af |mdat<....fy.....|
as you can see you have to modify first 32 bytes: where bytes [0..27]
you can just copy and bytes [28.. 31] should contain the offset where
moov atom starts - you can learn how to find that offset by playing
with python script called qtfaststart.py - run it with option --list,
for example:
# python qtfaststart.py --list normal_file.3gp
ftyp 0
mdat 1c
moov 7a44b
it will show atoms and their sizes but it is trivial to change it to
show atom's positions (like above):
for atom, pos, size in index:
print "%s %x" % (atom, pos)
pskink
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