Compress and uncompressed video size

The details depend on the format and resolution of the video files you want to upload.
In general, you can convert the video files to a different format with a suitable encoder to reduce the size of the videos before saving them into the server.
You can try using .NET Convert control from LEADTOOLS. The following code shows how you can use the convert control to convert the video file to MP4 format with H264 video compression:
//==============================//
using Leadtools.Multimedia;
//..
ConvertCtrl TestConvert = new ConvertCtrl(true);
TestConvert.SourceFile = @"c:\Test.avi";
TestConvert.TargetFormat = Leadtools.Multimedia.TargetFormatType.ISO;
TestConvert.VideoCompressors.H264.Selected = true;
TestConvert.AudioCompressors.AAC.Selected = true;
TestConvert.TargetFile = @"c:\ResConvert1.mp4";
//==============================//
Note that if you are planning to save these video files directly into database as binary data, it’s better that you save them into the server local drive, and then save the location of each video into the database field.
This should reduce the required time to save/load video into/from the database.