Blu-ray format rendering problems

[John Rofrano]

[Bill Shepherd] “When rendering to the Mpeg-2 Blu-ray format, to be able to play back on desktop players, the video quality is horrid.”

Something is wrong. What template are you using? All of the Blu-ray templates are higher quality than your 720p source.

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Bill Shepherd]

John,

This is my procedure.

1) Edit MP4 clips on vegas timeline, save and render in Main Concept (Blu-ray template 1440 x 1080 24P, 25 Mbps) and customize frame rate to 60P. (My original frame rate)

2) Insert rendered video in DVDA where it is further compressed.
optimized at 1280 x 720 resolution, 59.94 fps, 18.0 bit rate.

[John Rofrano]

[Bill Shepherd] “2) Insert rendered video in DVDA where it is further compressed. optimized at 1280 x 720 resolution, 59.94 fps, 18.0 bit rate.”

Why are you compressing twice? You are taking 720p and expanding it to 1080 and then shrinking it back to 720. I’m not surprised it looks terrible. Just render once to the final Blu-ray format and it should look fine. BTW, I don’t believe that Blu-ray supports 60fps so you’ll need to use 720-30p.

Also 18Mbps bit rate is low for MPEG2. You should be using 25Mbps. 18Mbps is for AVCHD delivery.

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Bill Shepherd]

John,

The XDCAM video looks great on may computer after rendering in the Blu-ray format at 1440 X 1080 resolution, 60fps, and 25Mbps. The video degrades somewhat when rendered at 30fps. When the clip is dropped into DVDA and the same parameters are set; other than the fps which is maxed at 24, the disc playback quality is very bad. I believe this is a result of the clip being recompressed to accomodate the 24 fps rate.

Any ideas or suggestions?

Thanks

[John Rofrano]

[Bill Shepherd] “Any ideas or suggestions?”

I’m sorry if my original suggestion wasn’t clear. What I meant by “Just render once to the final Blu-ray format and it should look fine” was don’t render to 1440 X 1080 resolution. If you final delivery format is Blu-ray 720-24p then render Blu-ray 720-24p right out of Vegas. They DVD Architect won’t re-compress it.

BTW, I wouldn’t bother to shoot at 60p if I’m only going to deliver 24p. This will cause problems because Vegas will have to blend frames to make 60 fit into 24 which may be part of your problem.

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Bill Shepherd]

John,

Let’s start again. I think there is confusion on both sides.

My original clips are in XDCAM-EX filmed at 720/60P, 35Mbps.
I render in Vedas Pro 10 saving as a type MainConcept MPEG-2 file.
I use a Blu-ray 1440X1080-24P template and modify it for 1280X720-60P, 25Mbps.

I drop file into DVDA and change the default bit rate from 18 to 25Mbps. The video is again compressed when rendered.

The video playback is bad on my desktop player.

Take 2

Render 1440×1080-24p modified to 60P 25Mbps

Dropped in DVDA with sane parameters and 25Mbps

Again poor playback in player.

Take 3

Render 1920X 1080-24P modified to 60P

Dropped in DVDA with same parameters and 25Mbps

Still bad playback.

Any Ideas?

[Bill Shepherd]

John,

One additional point to my previous post.

When I playback the rendered 1920X1080-60P video on my computer after being rendered in Vegas; the video is fantastic. DVDA insists on recompressing the video when rendering. I believe this is where the problem lies.

[John Rofrano]

[Bill Shepherd] “When I playback the rendered 1920X1080-60P video on my computer after being rendered in Vegas; the video is fantastic. DVDA insists on recompressing the video when rendering. I believe this is where the problem lies.”

Actually, the problem is that 1920X1080-60P is not a valid Blu-ray format.

I’m sorry I wasn’t more specific in my recommendation. You should use one of the Blu-ray templates in Veags and don’t change anything abut them! The problem is you are changing the Blu-ray templates and making them non-Blu-ray compliant. You can’t just change them to 60p use them for Blu-ray.

Check pages 26 & 27 of the DVD Architect Pro 5.2 manual and you will see all of the formats that are Blu-ray compliant. You will find:

• 1280×720 29.970i
• 1280×720 25i
• 1280×720 24.000p
• 1280×720 23.976p
• 1440×1080 29.970i
• 1440×1080 25i
• 1440×1080 24p
• 1440×1080 23.976p
• 1920×1080 29.970i
• 1920×1080 25i
• 1920×1080 24.000p
• 1920×1080 23.976p

…but no 60p which is why your videos are being recompressed.

~jr

http://www.johnrofrano.com
http://www.vasst.com