Yamb is the acronym of Yet Another Mp4Box UI. In other words, this is a new graphical interface for mp4box using, a tool based on command lines which is a part of GPAC Framework. This GUI is mainly dedicated to Windows OS.
I have used this to fix my .h264 files quite successfully although it can do many more. I found this software very useful.


Yamb is able to create, split and join mp4 or 3gp files containing principally

  • video streams with m4v, cmp, h264, 264, h263, 263 as input format or from avi, mpg, mpeg, vob, mp4, mov, ogg, qcp and 3gp files.
  • audio streams with aac, ac3, amr, awb, evc, mp3, msv, vorbis as input format or from avi, mpg, mpeg, vob (mp2 only), mp4 and 3gp files.
  • subtitles with srt (SubRip), ttxt (GPAC), sub (MicroDVD), idx/sub (VobSub) and xml (QuickTime TeXML) as input formats.
  • chapters from text format (OGM or GPAC).

Yamb can also extract some streams. In this case, this GUI is able to recover - a Video or Audio stream from AVI files.

  • a stream or an Audio/Vidéo track in a raw format.
  • a stream or an Audio/Vidéo track in a new mp4 file.
  • a visual track in avi file.
  • subtitles as srt or ttxt output format.
  • chapters as OGM text format.
  • Yamb can retrieve some informations about different streams especially for mp4, m4v, mov, cmp, ogg, qcp and 3gp files. You can get this whether by a global way or for each tracks available.
  • Yamb is also able to convert srt to ttxt subtitles format or ttxt to srt.
  • Yamb has some other additional settings concerning language, tracks names, Pixels Aspect Ratio, etc...
  • Yamb supports Unicode/UTF-8 completely.
  • Yamb supports also tagging.


Yamb 1 Yamb 2