- mp4join - joins 2 mp4 files with similar video/audio tracks encoding
- mp4join outputs a new file which is ISO/IEC 14496-1 compliant.
- mp4join is based on libmp4v2 and tools from mpeg4ip project
- mp4join requires 2 identical files in encoding parameters. Most important at this moment
are: FrameRate, VideoSize, Codec, Sample Rate for audio.
- Input mp4 files should have the video track as the first track.
- mp4join doesn't work with broken mp4 files. It needs basic atom descriptors.
- Supported video codecs: The video track creator only supports: xvid, m4v/mp4v, divx, cmp.
Profile variations doesn't matter.
- H.264 is NOT SUPPORTED.
- Supported audio codecs: The audio track creator (not finished) only supports AAC.
Profile variations doesn't matter (low complexity or main are ok)
- Encryption of the tracks is not supported
- There is no hinting of tracks (ie tracks won't be "streamable" thru Darwin Streaming Server)
- Only Video and Audio tracks are supported. Scene descriptors (BIFS) and Object Descriptors (OD) are
not supported.
- MP4 Metadata (author, title, genre) is partial supported (ie file has support for metadata but only
TOOL field is filled with "getica mpeg4 joiner 0.1.5")
- FrameRate is HARDCODED at 30. Variable Frame Rate is NOT SUPPORTED.
- Audio and Video tracks should have the SAME time length there is no padding/trimming done on joining.
Small differences <5s are "OK".
- VIDEO track should be the FIRST track (1) of the file. This is a limitation of extract_track function.
- AUDIO track should be the second track (2) of the file. This is a limitation of extract_track function.
- AUDIO track is not muxed back into the new file the AACCreator code is not finished.
- No 64bit support on files. Resulting file and extracted files should be <2Gb
- Track TimeScale is HARDCODED.
- Video Profile and Audio Profile are read from the VOL/VO header.
There is no way to specify a video/audio profile now.
- For AAC only ADTS header is supported (older ADIF is not supported).
Use run.sh to run the utility for console version or add mp4join.desktop to your desktop for GUI version.