Calculating Video Length

[scan]

Hello. I'm sorry if this is in the wrong section but here goes:

I am writing an application in Java that takes a user specified video file and converts it to h.624. The video file can be a variety of formats: Mpeg, wmv, etc.. What I would like to do is limit the video to 5 minutes, i.e. if the video is over 5 mins, it doesn't do the conversion. Further, the video files have no sound. I was wondering how I can determine the video length? Is there some general formula given the bitrate, size, type... etc??? I've found some purposed formula online but after testing out those formulas on some files, it doesn't work out. Any help would be appreciated. Thanks.

[cd090580]

Just use windows API, they will give you the length and other infos about the file.

or maybe you can read the header/index of the video file to get it's length

[scan]

Just use windows API, they will give you the length and other infos about the file.

or maybe you can read the header/index of the video file to get it's length

Thanks for the help but could you please be a little more specific? I should have pointed out that I know nothing when it comes to video media.

[poisondeathray]

filesize = bitrate x running time

So if you know two variables, you can figure out the third

Another option might be to use mediainfo which provides this information and more; perhaps you can integrate it into your application with a little programming, many other programs use it.