Below are some text
about the VOB file that may be helpful for you.
1. VOB stands for "Video Object" as defined in DVD
specifications. Although a vob file is also an MPEG
file, it has additional data that a standard MPEG
decoder will not understand, e.g., the private
data, which only a DVD decoder will understand.
Those data include information about the file
offsets and time duration of all chapters included
in the VOB file.
2. Whenever a vob file is edited, some of those
information will no longer be valid and may be
discarded by the editor; and some other data ("user
data" in the MPEG specs) which include the caption
texts, will be preserved by the editor. This is why
that the editor does not have a VOB format for
3. To write back the edited VOB files to a DVD
disc for playback on a standard DVD player, you will
need to go through another process called DVD
authoring, which can be done using Womble's DVD
Maker, or using another DVD authoring software.
4. Please note that for most of the DVD authoring
tools, the MPEG files saved from the editor will be
accepted without modifications.
5.In order to preserve the original chapters, you
should import the VOB files from a commercial DVD
disc by using a software tool such as the DVD
Decrypter or the DVD SmartRipper. Since those free
software are very efficient in reading a DVD disc,
no slower than direct copying the VOB files from
within the Windows file explorer, this work around
does not incur any additional manual work, nor any
loss of efficiency.
6. Since the editor is single file based, and
since the DVD file system breaks one continuous
movie stream into multiple 1 GB segments, this
introduces video and audio discontinuities when
loaded by the editor as consecutive clips. Those
discontinuities may exhibit as loss of video for a
maximum of one GOP (about half of a second) and as
loss of audio for a maximum of two encoded sound
frames (about 50 to 60 milliseconds). Worse still,
this frequently destroys the original
synchronization between video and audio. To work
around this problem, it is always better to read the
DVD disc into the computer as one single file by
setting the "No splitting" option in a DVD reader.
Please note that a new tool called "MPEG MBS
Scanner" has been added to the editor to alleviate
the difficulty caused by the problem discussed
Other FAQ (Frequently Asked Questions)