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VirtualDub is a video editing tool which allows the user to perform basic editing tasks such as cropping frames, cropping video shots, adding video segments, adjusting audio tracks, and resizing video.
Furthermore, VirtualDub has real-time video capture built-in so with a sufficiently fast CPU, one could capture DivX video in one step.
It also lets the user perform more general video filtering operations such as 2:1 reduction, 3x3 averaging, blurring, deinterlacing, embossing, sharpening, smoothing, and rotation.
VirtualDub separates the video stream from the audio stream so that the user can work on one stream without distorting the other. For example, if a video stream was encoded with mpeg-1 and pcm audio, then the user could read in the video using VirtualDub, leave the mpeg-1 video exactly as it is and just convert the pcm audio to mpeg layer 3 audio; or he could compress the video to DivX but leave the pcm audio as is.
VirtualDub does not read in vob/vts files directly. You would use a program such as Xmpeg for that process. However, Xmpeg does not read in DivX avi files. VirtualDub does read in DivX avi files. So, if you wanted to make an archival copy of your personal DVD, then you would use a program such as SmartRipper to decode the vob/vts files from the original DVD to your hard drive. Xmpeg could be used to convert the vob/vts files to a DivX avi file. VirtualDub could be used to edit the DivX avi file.
Suppose you want to resize a video from 720x480 to 352x192, then you would (1) open the avi file; Two windows are shown which show the input video (left) and the output video (right). (2) Under the Video menu, select "Full Processing mode." Select Filters. Click on the Add button, click on the resize filter, and click OK. Type in the new resolution of 352 and 192 and select bicubic for the filter mode. Click OK to the dialog boxes. (3) Under the File menu, click on Save as Avi, type in a filename, and click on the Save button. You should see a window open which describes the processing of the video including how long it should take to process.
Joining Two AVIs
Suppose you want to join two avi files (vid1.avi and vid2.avi) together. To have
the best chance of audio/video sync on playback you should
add an end offset to the first avi file. (1) Load the
movie (vid1.avi). Set both audio and video to "Direct
Stream Copy." Click on Video | Select Range. Enter a
small value (i.e. 15) in "End Offset" row in the Frames column. Save
the movie as vid1a.avi. Now load vid1a and under
File | Append Video Segment, load vid2.avi. Save the avi and hopefully the audio/video are in sync. Note that
some audio codecs have a slight accumulating error in them such as the original mp3 codec which can result in out of sync audio/video
If the audio was compressed using a VBR (variable bitrate) method, then you might need to save the audio track as uncompressed before doing the resizing. To do this, select under the Audio menu, "Full Processing mode"; then click on "Compression" and select "No compression (PCM)." Click OK. Under the File menu, click on "Save WAV" which will prompt you for a filename. One hour of audio will be roughly 600 MB. When resizing the video, you should select from the Audio menu, "WAV audio" which will prompt you for an input audio file.
Re-Syncing Audio to Video
In some cases, you will have a video where the audio and video are
out of sync. If you can determine the delay in the audio, then
you can resync them by the following: Set both video and
audio to "Direct Stream Copy." Select Audio | Interleaving.
Suppose that the audio should be delayed by 800ms, then just
put in the 800ms in the delay box. Save as Avi. For an hour
long video, this process should take only 2 minutes.
Processing an Entire Directory
Another powerful feature of VirtualDub is the ability
to process all the video files in a directory. First, set
the audio and video compression to your preferences. Second,
go to File | Job Control. Select Edit | Process Directory.
A dialog box will appear which prompts you for the source directory
and then the destination directory. Afterwards, just click
on the "Start" button in the VirtualDub Job Control box.
Using DivX 2 Pass Encoding
Load your AVI. In the video compression configuration of DivX, select 2 pass, 1st pass and select a bitrate. Go to the Save Avi As
dialog box and click on "Add operation to job list" box.
Enter a filename such as "myvideo-1stpass" and click Save. Now, go back into
the video compression configuration of DivX and select
2 pass, 2nd pass. Don't change the bitrate from the 1st pass. Go to the Save Avi As dialog box
and click again on "Add operation to job list" box. Enter
a filename such as "myvideo-2ndpass" and click Save. Now click on File | Job control
and click on the Start button. VirtualDub will place
the final avi in the 2nd pass filename which in our example