This question was inspired by Anderton signature TWO NEW music videos on my YouTube channel: "Catch Me, I'm Dreaming"
and "Replay, Replay." Both done in X3e. Listen...like...share...subscribe!
 
I have always wondered how video feature works in Sonar is it that you can actually edited footage and make your sound track all in X3? Is it that you take video that is already edited and import into X3 and then make your sound track and export them separately? Any information would be helpful I use Adobe Premier for videos but I would take advantage of X3 over Adobe Audition

Well first of all, thanks for the plug 
 
I'm a huge fan of Sony Vegas Pro, probably because it started life as a DAW that grew video capabilities. It's great to be able to use VST and DirectX plug-ins, ASIO, etc. Also, it lets me "think like a musician."
 
As a result, I tend to use SONAR and Vegas as a team, but not always. Also, it depends on the video...
 
Tutorial Videos
For my advanced workshop videos, I did the narration first in SONAR (with a lot of editing and sweetening), then loaded it in Vegas. While Vegas played back the narration, I listened and did the moves required for the video in SONAR (while capturing the moves with Hypercam). I then took the Hypercam video, which also contained what I was doing with the audio in SONAR, loaded it into Vegas, and made it conform to the narration. I then rendered separate audio and video streams from Vegas, which was what Streamworks wanted in order to assemble the videos.
 
 
This requires using two interfaces and frankly, the patching and preferences were sufficiently complex that I ended up writing documentation for how to do it! That way I just had to follow the steps to set it up.
 
Soundtracks for Existing Videos
This is what I did for trade shows like for Harmony Central. I'd edit the footage first in Vegas, then load the video into SONAR. I'd then create the sound track in SONAR. In some cases I also worked on the audio part of the video in SONAR, or from audio "flown in" from a separate hand-held recorder. Once the audio was done, I'd export, load it into Vegas, and do the rendering from there.
 
Much depends on whether you're cutting video to audio, or audio to video. You can render the video/audio combination from SONAR, which is fine if you need AVI or Windows Media Video (or Quicktime, if you're running a 32-bit system...c'mon, Apple, 64 bits has been around for a while!). Most of the time I need to do MP4, which is why I render from Vegas.

Also FYI - the video for "Catch Me, I'm Dreaming" was all done in Vegas Pro, no extra plug-ins or anything.
 

I'm also a strong supported of Vegas Video Pro. I have ver. 13. 
 
I did a commercial for my local Veterans group for a parade and I did all the video in Vegas and the voice over plus music in Sonar.
 
I have also done videos for a local Vet homeless shelter for a few years. Using the same combination.
 
Each has its strength for its end of the process. I like Vegas because it also supports my Mackie Control too. But Premier is a very good NLE (non linear editor).   

BMOG
This question was inspired by Anderton signature TWO NEW music videos on my YouTube channel: "Catch Me, I'm Dreaming"
and "Replay, Replay." Both done in X3e. Listen...like...share...subscribe!
 
I have always wondered how video feature works in Sonar is it that you can actually edited footage and make your sound track all in X3? Is it that you take video that is already edited and import into X3 and then make your sound track and export them separately? Any information would be helpful I use Adobe Premier for videos but I would take advantage of X3 over Adobe Audition

I have the same products as you and my work flow is usually simple.  I do my video editing in Premiere/AFter Effects.  If the project is simple (interviews, events and other things with no complex music or sound design) I will keep the whole project there.  Beyond simple projects I do rough cut to make sure timing of edits is finalized. If a few details like color grading still needs work, I don't worry about it as long as there is nothing left that affects timing. If doing something like a simple music bed for a commercial or background for corp video and such, I export just the audio  and import into sonar for timing purposes.  If I have particular points of video that have visual cues, I render ad low res but visually clear video to import into Sonar.  I then rebuild the audio using raw assets in sonar (easier than it sounds since it is likely to be a straight shot voiceover).  I do whatever sound editing and then render out mastered audio to import into premiere.  Sonar simply does not have the video export options for most of my needs. The couple extra steps to import and export are negated by the speed i can edit audio in Sonar as compared to clumsily attempting to in Premiere.

I'm with Craig, I use Vegas for video editing. I render a lowres proxy in Vegas and use that in Sonar for music production. A music track is then produced in Sonar and exported as a file. The music file is then imported into Vegas. Very straight forward.
 
I'm amazed at the number of folks that are under the impression that you need to score to the finished video. Using proxies instead is is an old editors trick.

 I've had the best luck and stability using Studio One.   

kitekrazy1
 I've had the best luck and stability using Studio One.   

Does SOP still work only with Quicktime, and only the most expensive version of SOP supports video? We don't know which version of SONAR the OP is using, but all three versions of SONAR support Quicktime, mpeg, AVI, and WMV import. That can be very helpful.

 Studio One 64 bit is the most stable from my experience when I've dealt with the QT format.  Usually I had to run the 32 bit in Sonar or Reaper for QT.   It is the worst video format to work with audio.  I went to a Mac Video production forum for support and even the Mac die hards say QT format sucks.
 I did one in Sonar but I rendered the QT to mpeg2 to save my sanity. That was when I stopped installing 32 and 64 bit versions of Sonar.
 Quicktime and 64 bit DAWs don't get along very well.  

kitekrazy1
 Quicktime and 64 bit DAWs don't get along very well. 

AFAIK there is no 64-bit QuickTime codec for Windows. When you install SONAR on a 64-bit system and you reach the optional stuff, it says that QuickTime is only for 32-bit installations.