header information of MPEG-4 and AVI

[firadayat]

Hi everyone, i am a kind of newbie here. i need some help on converting videos by editing their binary/hex contents. how can i know the header information of a MPEG-4 file and AVI file. what are the differences between these two headers, and if it is possible how can i convert an MPEG-4 video file into an AVI file by editing their header information. Thanks

[guns1inger]

Mpeg-4 is a compression method, of which there are several types. AVI is a container, into which video and audio are stored, using different methods of compression.

Perhaps you need to be more specific about what you are actually trying to do.

You cannot convert one video from to another by simply changing a few bits in the header. It may be possible to make an application look differently at a video by making small changes. For example, changing the fourCC value from Xvid to Divx may allow some players to play a video that they would not ordinarily play.

However you cannot simply change something like an MP4 container to an AVI container with a few small changes in a hex editor. There is a lot more to it that that. Not everything allowable in an MP4 container is allowable in an AVI container, and the reverse is also true.

[Supreme2k]

Actually, I thought that you could simply change a file by renaming it. At least it worked when I renamed notepad++.exe to Microsoft Office Corporate Edition.exe - Instant savings!







but basically