Hunh? I'm asking if anyone has experience with doing rendering of video only in Vegas Pro 9c. I noticed incredible rendering speed in another program when I chose the option to leave the rendering out of the final mix. I thought if I deleted the audio tracks in Vegas, I would see a similar increase in rendering speeds but I didn't. Maybe someone has tried this and knows how to set it up so that I can render faster. So far I tried deleteing the audio files and also going into "custom" where I chose to not include the audio. Regardless, it didn't seem to improve rendering speeds.

Apples and oranges? hunh? Its simply with audio or without audio. I'm not comparing algorithms at all.

Put simply the amount of time to render video is way higher than it is to render audio. I'm assuming comparing apples to apples i.e. one track of uncompressed video and one track of uncompressed audio to the same or very similar codecs. This is simply due to the amount of data involved.

Bob.

It sounds like what going on is that this other program is doing video as a smart-render or file copy when it doesn't have to encode the audio along with the file, but it is doing a full render when audio is included. Hence the longer time. Like every program, Vegas smart-renders a heck of a lot faster than it does a real render, but whether you include audio or not will not make this difference in Vegas. I don't think you'll find any relation between this program and Vegas's render times.

I believe Vegas also renders audio on a different thread than video. You will never need to wait for this thread since video will almost always take longer.

Sorry you didn't understand.

No, Vegas' render times do not decrease significantly if you leave out the audio, whether it is interleaved or not. The audio rendering uses significantly less overhead than the video.. It is easy enough to run one's own tests if curious about this.

Why you observed what you did in another unrelated application that serves a different purpose entirely, is anybody's guess. Perhaps you would want to pursue that inquiry on their forum as well.

Vegas 9c, and pretty much all versions prior, gobbles up audio! It's very efficient at what it does.

Turning off audio on a long render will save a minor amount of time, perhaps as little as 2%. This is because Vegas is so quick at doing the audio, and there's so much MORE data in video.

But 2% on a 5 hour render is worthwhile.

In relation to your experience with CamStudio - I think this may be more a symptom of CamStudio being inefficient with audio.

Cheers,
Jason