I recommend VirtulDub. It is famous and powerful, and it is a free software. The official version of VirtulDub supports the conversion of video files such as AVI (excluding DV-AVI), MPEG- 1 and DAT, and some variants of VirtulDub can also import video files in MPEG-2 and ASF formats. The most common situation in practical application is to use it to convert VCD(MPEG- 1 format) into DivX AVI(MPEG-4). This conversion can reduce the file size to 1/2 to 1/3 of the original file while maintaining the image quality, which is an excellent way to save VCD.

Run VirtulDub, select "Open Video File" in the file menu (Figure 1), import the video file to be converted, select "Full Processing Mode" in the video menu, then select "Compression" command (Figure 2), and then select the video encoder (codec) in the pop-up "Select Video Compression" dialog box.

There are many options for setting the above two encoders, but generally speaking, you only need to set the code rate. For example, for the XviD encoder (Figure 3), the bit rate can be set to 450 kbps to 550 kbps, which is suitable for VCD quality video; For DVD quality video, it can be set to 1500Kbps or higher.

The audio part of MPEG- 1 file generally adopts MPEG- 1 audio layer II format, and the bit rate is as high as 224Kbps, so it needs to be compressed into small MP3 format. Select "Full Processing Mode" and "Source Audio" in the audio menu, then select the "Compression" command, and select "divx-) Audio" with specifications of "64kbps, 44 KHz and DivX for stereo".

Finally, select the "Save As AVI File" command in the "File" menu, and save it by coding and naming the file.

If you don't like it, recommend a domestic video compression weapon-Real 2002.

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