Doubling raw date of 3GP

[mikegarycole]

Hello!

I need to take a 3gp file I have, and in a hex editor, double everything. But I need to leave the header and footer intact.
Essentially, the output has to be twice as long as the original. Can someone help me do this? I have zero experience with hex editors.

Thanks!

[Cornucopia]

You don't need to do this with a hex editor, you just need players to interpret it as half speed (that's all you are really wanting to do, right?).
So use something like yamb / mp4box to halve the framerate. Note: this is NOT converting, just re-tagging the existing frames, so no reencoding or quality loss.

Scott

[aedipuss]

even if it was done with a hex editor it most likely wouldn't work. the headers wouldn't match what was in the files anymore. if it played at all it would play normal speed.

better would be to import it into a video editor and double it's length then render out a new file.

[Cornucopia]

No, that would be much slower and would lose quality and double the filesize (assuming same bitrate).

Scott