Usually converting DVD files causes troubles due to the fact that the structure of a DVD disc is rather complicated. In this page you will find tips on how to optimize processing of DVD files.

When you open a DVD disc in Windows Explorer, usually you will find 2 folders there - VIDEO_TS and AUDIO_TS. Usually AUDIO_TS folder is empty.

The VIDEO_TS folder contains files with BUP, VOB and IFO extension. AVS Video Converter uses VOB and IFO files. VOB files contain the video and audio streams directly. They cannot be more than approximately 1 GB in size. That's why most DVDs contain several VOB files. VOB files, which end with the number 0 usually are menus and not the videos themselves. (E.g. - VTS_01_0.vob - is a menu file).

IFO Files contain the information about the structure of the disc, of the sequence of chapters, etc.

When you convert a DVD to another format, we recommend that you follow this instruction in order to avoid incorrect file reading and sound and desynchronization between audio and video in the output file.

1. Convert from a DVD disc directly!

When you browse for your Input Video File, select your DVD-Drive, open the VIDEO_TS folder and select the VIDEO_TS.IFO file. Do not select the file, the name of which ends on zero, as it is a menu file. We encourage you to select the IFO file, because this file applies to the whole video stream and not to separate chapters.

Note: in the field Files of type: All video files is selected, but in fact, VOB files are not reflected to avoid confusion.

If you still would like to select VOB files, choose VOB in the list of file types and choose a necessary VOB file.

Note: converting separate VOBs instead of referring to a single IFO file may cause desynchronization between the audio and the video in your output file.

2. After you have selected the VIDEO_TS.IFO file - follow the instructions that are given for converting.

If you prefer to convert files that are located on your hard disc drive, please make sure that you copy not only VOB files, but IFO files as well. When you convert referring to VOB files, we cannot guarantee that your output file will be in synch.

Note: many DVDs are multi-lingual. We provide an option of selecting the audio track for your output file. To select the necessary audio track, click << Advanced button twice and in the field below select the audio track in the combo box: