old tool for changing only Avi or mpg header to mp4

[melani]

there used to be an old tool - so that when u converted - u would not have to re-encode and loose quality - it was called something 3kk or header changer ?
does anyone remember this old tool ?

any links ??

can it be used for changing header in a wmv to mp4 ?? without re-encoding it ?

[jagabo]

Try AviDemux. Open the AVI, set video and audio output to COPY, set output format to MP4, save. Beware that MP4 is not very flexible in terms of codec support so you may have to reencode.

I don't think any WMV codecs care acceptable in MP4. They will have to be reencoded.

[Cornucopia]

Understand also that changing a few "header" values will no more turn a wmv file into an mp4 file than an attempt at renaming the extension. Under the hood, all the different container types are quite different and unique in their structure (although MOV and MP4 are similar due to mp4 being a forked offshoot of mov).

To do it properly you would need to remux (remultiplex, aka demux and then mux again). That is what Avidemux may do in the right circumstances.

And what jagabo said re the possibility of needing to reencode if wmv, that is totally correct.


Scott

[El Heggunte]

I don't think any WMV codecs care acceptable in MP4. They will have to be reencoded.

Only VC-1 (fourCC "WVC1", not "WMV3") is acceptable in the MP4 container.

[Cornucopia]

Yeah, that's what I was thinking also.


Scott

[melani]

I don't think any WMV codecs care acceptable in MP4. They will have to be reencoded.

Only VC-1 (fourCC "WVC1", not "WMV3") is acceptable in the MP4 container.

U hit the nail on the head - it was called FourCC chnager -

https://sourceforge.net/projects/vsfccchanger/postdownload - but Unfortunately not for wmv to mp4

[jagabo]

Fourcc Changer only changes the fourcc code of AVI files (and Divx files because Divx files were just AVI files with a different extension). The fourcc is a four letter code that indicates what codec was used to compress the video (and hence how to decompress the video). It was only useful for changing the codes between Divx and Xvid fourcc's. Some players only played one or the other, even though they were the same thing.

Changing the fourcc does not change an AVI container into an MP4 (or any other) container (containers all have different ways of organizing data internally). What you want is a remuxer (re-multiplexer) which re-wraps the compressed contents of an AVI container into another container. Like taking a cake out of a cardboard box and putting it in a glass cake dish, the cake isn't degraded in any way, just the container is different.

As was mentioned before AviDemux is useful for remuxing and easy to use. If it's necessary to re-compress the video or audio to another codec AviDemux can do that too. If you can live with MKV I highly recommend you use that instead of MP4. It can contain many more codecs than MP4. You can use MkvToolnix GUI to remux specifically to MKV. Just about anything in an AVI file can be remuxed into MKV. The same isn't true for MP4.