MediaInfo supplies technical and tag information about a video or audio file.
This is free software (free of charge and free to access source code: GPL or LGPL licence)
What information can I get from MediaInfo?

* General: title, author, director, album, track number, date, duration...
* Video: codec, aspect, fps, bitrate...
* Audio: codec, sample rate, channels, language, bitrate...
* Text: language of subtitle
* Chapters: number of chapters, list of chapters

DivX, XviD, H263, H.263, H264, x264, ASP, AVC, iTunes, MPEG-1, MPEG1, MPEG-2, MPEG2, MPEG-4, MPEG4, MP4, M4A, M4V, QuickTime, RealVideo, RealAudio, RA, RM, MSMPEG4v1, MSMPEG4v2, MSMPEG4v3, VOB, DVD, WMA, VMW, ASF, 3GP, 3GPP, 3GP2
What format (container) does MediaInfo support?

* Video: MKV, OGM, AVI, DivX, WMV, QuickTime, Real, MPEG-1, MPEG-2, MPEG-4, DVD (VOB)...
(Codecs: DivX, XviD, MSMPEG4, ASP, H.264, AVC...)
* Audio: OGG, MP3, WAV, RA, AC3, DTS, AAC, M4A, AU, AIFF...
* Subtitles: SRT, SSA, ASS, SAMI...

multiplexer, demuxer, mixer, muxer, video decoder, audio decoder, PAL, NTSC
What can I do with it?

* Read many video and audio file formats
* Different methods of viewing information (text, sheet, tree, HTML...)
* You can customise these views
* Exporting information as text, CSV, HTML...
* Graphical Interface, or Command Line, or DLL
* Integration with MS-Windows shell (drag 'n' drop, and Context menu)
* Internationalisation: any language display on any version of your Operating System
* Localisation capability (but volunteers needed)