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Rendering in Sony Vegas

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Rendering in Sony Vegas

Postby alandworsky » Tue Mar 03, 2020 11:24 pm

I'm looking for a recommendation for a rendering template in Sony Vegas Pro 13. I create 10 minute video lessons that are delivered as downloads to my customers. When I render a 10 minute lesson now, it creates a file size of half a gig. I'd like that file size to be closer to 100 MB.

My video properties are HD 1080-24p (1920x1080, 23.976 fps). The current rendering template I'm using has video format AVC with pixels at 1000 and a bit rate of 10,000,000.
Can I simply reduce the bitrate until I get a file size that's small enough? Or should I be using a different template?

Thanks so much!
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Re: Rendering in Sony Vegas

Postby Chris B » Wed Mar 04, 2020 2:13 am

100MB for 10 minutes if 800,000,000 bits in 600 seconds - or 1,333,333 bits per second - or 1.3 megabits. That's very low and your video quality will likely suffer. Any scene with high detail or movement will likely become blocky or blurry. For reference youtube's recommended bitrates are 8 megabits for 1080p and 5 megabits for 720p which would put you at around the 500MB mark.

However to answer the question yes you can reduce the bitrate. You could also consider if you can accept 720p instead of 1080p. You can also try the Main Concept AVC/mp4 encoder which may do better at low bitrates. Using the constant bitrate or 2 pass encoding can help the encoder keep to the target bitrate. Lastly when you're going that low the audio can be a significant portion of the video so you should look to reduce that bitrate as well.
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Re: Rendering in Sony Vegas

Postby Steve Grisetti » Wed Mar 04, 2020 7:56 am

Also, Alan, can you tell us how you're going to be distributing or sharing your videos?

Who is putting the size restrictions on your video files?

If you're just trying to keep the video files small so that your customers can download them easily, 100 mb is quite a restriction to impose on yourself for a 10-minute video. As Chris says, an HD video at that size will have some real compromises.
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Re: Rendering in Sony Vegas

Postby alandworsky » Wed Mar 04, 2020 10:42 am

Thanks so much to both of you for your replies! In answer to Steve's question: I'm putting the limitation on myself. I didn't want my customers to have to wait too long for the downloading process to be completed, especially because many are in countries outside the U.S. where their internet speeds aren't that great. My website in on Shopify, and when a customer orders a video the download is handled by a related company called Fetch where the files reside. Fetch puts an overall limit on the amount of data I can keep on its server and if I go over that amount (now 35 gigs) I have to pay them a higher monthly fee. So I do have an incentive to keep the total size of my files within that limit.

Before I started making and rendering the videos myself in Sony Vegas, I got help from a video editor who would create the files on a Mac with Final Cut. When he was done, a one-hour video created a 1 gig file (although I have no idea how he did this from a technical standpoint) and it seemed like the quality was OK. With my current settings in Vegas, each one-hour video ends up being about 3 gigs. So I thought there might be a preset template that would produce decent quality in a file size about 1/3 of my current template.

After digesting the feedback I've gotten here, my next experiment is going to be to simply reduce the bitrate on my current template from 10,000,000 to 4,000,000 and then see what the quality looks like. I'll keep you posted.

Thanks again!
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Re: Rendering in Sony Vegas

Postby sidd finch » Wed Mar 04, 2020 11:32 am

If your customers are viewing on smartphones and or laptops then 720p will work well. You might try to render a sample to see if the file size is something you can live with.

I frequently output to 720p as some of the videos I create are mainly consumed on smartphones.

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Re: Rendering in Sony Vegas

Postby Steve Grisetti » Wed Mar 04, 2020 1:45 pm

Great point, Sidd! Reducing the videos to 1280x720 will save you a lot of file size and will still look good on most devices.
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Re: Rendering in Sony Vegas

Postby alandworsky » Wed Mar 04, 2020 11:16 pm

I followed the great advice I got here and just rendered a 10-minute video in 720p. The result looked and played fine, and the file size was only 168 MB. Problem solved!
Thanks again to everyone who chimed in on my post!
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Re: Rendering in Sony Vegas

Postby Steve Grisetti » Thu Mar 05, 2020 7:41 am

That's our Muvipix community! Glad we could help.
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