MediaArea.net SARL - (Free)
The codec used by a particular video is now very easy to find using the useful application named MediaInfo.
MediaInfo is a quick and effective tool developed to offer detailed information about the multimedia documents such as the codec used by a particular video.
The application is able to scan the files and then indicate the audio (MP3, Flac, AAC, WMA) and video (DivX, XviD, H264/AVC, WMV) codecs used. A link to the website to download the codec is also available, offering the possibility to install the codecs in a very convenient way.
MediaInfo is able to provide lots of information, including the number of frames per second, the rate used, the sampling frequency audio tracks or the number of channels available. MediaInfo also integrates to the context menu of Windows Explorer to access information from a sequence with a few clicks.
Its interface is more than simple: with just a point to the file or directory containing audio files and / or video it scans them presenting the result in different ways such as table, tree, plain text, or HTML page. Data can also be exported into text, HTML or CSV.