Rending 720p 29fps source file to Blu Ray?

ShaneJ wrote on 5/26/2014, 6:25 PM
I'm very new to burning Blu Rays, and after over ten years of authoring DVDs on a regular basis, Blu Rays are quite different. I've successfully burned Blu Rays from very compatible source footage with 1080i. Sony Vegas has templates and settings (that I usually further tweak) that best accommodate the render without having DVDA requiring recompression.

Okay, here is where my question lies. I have footage from a Sony digital camera (can't remember the model number because I don't have it anymore) from my cousin's wedding. Over an hour of footage that I want to burn to a Blu Ray. I've already rendered DVD quality, but want to do a Blu Ray at all. The problems I'm running into are the fact that none of the template or settings have anything at the specs of the source footage. The video files from this camera are 720p with a resolution of 1280 x 720, progressive. The frame rate is 29 fps. I've tried several renders, but DVDA always wants to recompress.

The only probable settings I can see possibly using is rendering it with 59fps using the AVC format. There is no 29fps option that DVDA would take. Seems I can only use 24fps, 50fps, or 59fps.

Here is a link to an example file. It's 19 seconds, long enough to get the specs. https://www.dropbox.com/s/3p4e8s4se8jvlec/IMG_201210200154.MP4

Does anyone have any suggestions for which render settings for Blu Ray would be best to use?

Thanks in advance.

Comments

PeterDuke wrote on 5/27/2014, 8:04 AM
The file is in a MP4 container. Blu-rays use m2ts.
ShaneJ wrote on 5/27/2014, 5:30 PM
That doesn't answer my question and you are missing the point. I'm not talking about containers at all. I'm rendering these these out to a finished file in Vegas. My question is what render specs do I use to render this out to make them blu ray compatible? Which render settings would be best to match the specs of the original source file that DVDA would take without recompressing?

Seems I'm not going to get any quick answers on this board. I'm going to repost this on the Sony Vegas forum.
PeterDuke wrote on 5/27/2014, 7:15 PM
OK I'll try again.

You have 1280x720x30p source. That is not an option in the Blu-ray spec. (See the wiki page). You won't want to change frame rate so I suggest you try 1920x1080x60i using a Sony AVC template. (In this context, 60i means 29.97 frames per second.)
videoITguy wrote on 5/27/2014, 7:15 PM
You can render out to any legit Blu-ray spec. Don't fret over the recompress msg.
PeterDuke wrote on 5/27/2014, 7:27 PM
I just tried what I suggested, and it did not recompress.
ShaneJ wrote on 5/27/2014, 7:40 PM
Thank you Peter. I was thinking of doing that, however, I remember reading several times in the past on these very forums that if the source videos are progressive, they should be rendered progressive and not be rendered to interlaced. That is my concern. So I'd rather use a setting that I can render my finished product out and keep it progressive and have DVDA accept it and prepare and burn to Blu Ray without prompting to recompress. I want all rendering to be finished in Vegas and only prepare and burn in DVDA like it's supposed to.

I'm also concerned about upscaling to 1080i or 1080p since the source is 720p. All I'm looking for is a template and/or tweaked render spec that DVDA will accept preserving the 720p resolution without interlacing and upscaling. Looks like the only issue is the framerate. But just want to make sure from others here with more experience along these lines.

Thanks again for the response.
PeterDuke wrote on 5/27/2014, 7:59 PM
If you think about what you are actually doing, you will see that each FRAME is identical whether you render your source to 30p or 60i. The socalled 2nd field will not be displaced 1/60th of a second as in a true 60i source.

If you load in a true 60i source video into a 60p project, each field gets interpolated into a full frame. As you step along one frame at a time you will see smoooth motion from one field to the next each 1/60th of a second. However, if you load in your rendered video, as you step along, the image will only change each 1/30 of a second.

Upscaling from 1280x720 to 1920x1080 should not cause loss of quality if you do it right. (Make sure that you set the project properties to "progressive" in this case) It will likely make a bigger file for the same quality, however.

Changing frame rate is more problematic because you have to interpolate in time to generate the new frames.