MP4Box is a popular MP4 multiplexer that can easily and quickly import MPEG-4 video, DivX, XviD, h264, 3ivx, etc audio streams and subtitles into the .mp4 container. MP4Box performs in-place rewrite of IsoMedia files (the input file is overwritten). You can change this behaviour by using the -out Filename option.

The end result will be a compliant MP4 stream. MP4Box can also easily extract streams from a .mp4. MP4Box is a command line utility but can be used with graphical user interfaces such as YAMB.

MP4Box usually generates a temporary file when creating a new IsoMedia file. The location of this temporary file is OS-dependent, and it may happen that the drive/partition the temporary file is created on has not enough space or no write access. In such a case, you can specify a temporary file location with the -tmp path_to_dir option.

MP4Box does NOT perform audio/video/image transcoding (re-encoding media tracks to a different coded format). If you need to transcode content, you will need other tools.

MP4Box can convert the following files into compliant IsoMedia files:
1. RAW Formats and extensions:
2. MPEG-4 Video (.cmp .m4v)
3. MPEG-4 Audio ADTS-AAC (.aac) - ADIF or RAW formats not supported
4. MPEG-1/2 Video (.m1v .m2v)
5. MPEG-1/2 Audio (.mp3)
6. JPEG and PNG Images (.jpg .jpeg .m4v)
7. H263 Video (.263 .h263)
8. AVC/H264 Video (.264 .h264, .26l .h26l)
9. AMR and AMR-WideBand Speech (.amr .awb)
10. EVRC Speech (.evc)
11. SMV Speech (.smv)
12. VobSub subtitles (.idx)

AV Containers and extensions:
1. AVI (.avi) - Only MPEG-4 SP/ASP video and MP3 audio supported at the current time. To import AVC/H264 video, you must first extract the avi track with MP4Box -aviraw video file.avi.
2. MPEG-TS (.m2t .ts) - Only MPEG-1/2 video and MPEG-1/2 audio supported at the current time.
3. MPEG-PS (.mpg .mpeg .vob) - Only MPEG-1/2 video and MPEG-1/2 audio supported at the current time.
4. QCP (.qcp)
5. XIPH OGG (.ogg) - EXPERIMENTAL and not relevant to any IsoMedia-based standards. Only Vorbis audio and Theora video supported.
6. NHNT (.media .info .nhnt) - for more info on this format
7. NHML (.nhml) - for more info on this format, check the NHML documentation.
8. SAF (.saf) - SAF is the MPEG-4 LASeR transport format over http.
9. IsoMedia files (no extension checking)

Text formats and extensions:
1. SRT Subtitles (.srt)
2. SUB Subtitles (.sub)
3. QuickTime TeXML (.xml)
4. GPAC Timed Text (.ttxt)

The license of this software is Freeware, you can free download and free use this video editing software.