how to get the duration from a mp4 media file by C#

Question

As I know a mp4 media file size, how could i calculate the file duration through file size? (C#)

Thanks.

Answer 1

You may look at ID3 Metadata Tags in the file. You should use TagLib Sharp for read ID3 tags from mp3/mp4 files.

Answer 2

I use the NReco.VideoInfo library to achieve this very easily. It's a simple as giving the library a file path and it spits out the metadata:

var ffProbe = new FFProbe();
var videoInfo = ffProbe.GetMediaInfo(blob.Uri.AbsoluteUri);
return videoInfo.Duration.TotalMilliseconds;

Answer 3

Reading this: https://web.archive.org/web/20121130070329/http://neuron2.net/LVG/ratesandsizes.html I think perhaps you can approximately solve the number of seconds from the equation presented in the section Calculating the File Size of a Bitrate-Based Format using the metadata from the file.

Edit: URL changed as a suggestion by @BrentRittenhouse.

Answer 4

使用ffmpeg命令行并让它报告您的文件属性。