render vs. burn bitrate question

ThatJimGuy wrote on 3/31/2004, 9:55 AM

This may be a stupid question, but I'm a bit confused: Why should I render an mpg for use with DVDA using anything but a CBR of 8Mbps, since that is most likely what I am going to burn it at? I use the Main Concept encoder provided with V4. The reason I ask is that I rendered an mpg using the default VBR settings, and it resulted in a file that was OOS (the audio/video were out of sync). So basically, if I plan to burn at 8Mbps or less, why should I (or just *should I*) use VBR or a higher/lower CBR on the rendering?

Comments

Spot|DSE wrote on 3/31/2004, 6:12 PM

They shouldn't have been out of sync at any bitrate. Sometimes, you need to use a lower bitrate to fit content on disk. If you aren't running into that problem, or are doing shorter vids on a disk, then 8M isn't hurting anything. Going higher than that runs the risk of some DVD players not being able to manage the higher rate.

ThatJimGuy wrote on 4/1/2004, 7:54 AM

Thanks for the info. I found out why it was OOS - there was an audio artifact in the stream that caused the renderer to go OOS on me. I don't know why it did this, the original just had a spike on the audio, went OOS for maybe 2 secs then returned in sync, but the rendered one was OOS all the way after this. I recaptured a clean copy and it works fine.

I did notice that my DVD player froze when I tried 9.8M, so I stick to 8 or less now, which is fine for what I'm doing.

Anyway, I still don't know if there is any reason to render using VBR or a lower bitrate than I am going to burn at. If anyone has any reasons why I might want to do this, let me know please!

thanks
-jim

riredale wrote on 4/1/2004, 8:20 AM

Check out this thread.