Rendering Question

randyvild wrote on 12/11/2002, 2:33 AM

Vegas 3.0 gives an option for "enable to pass encoding"
What does this do for streaming?

Also under bitrate it says, "What are the target bitrate bandwiths you want to use?"
If my target is cable/dsl and I check 128K do I also check all the previous 3 choices?

PLease help?

Comments

randyvild wrote on 12/11/2002, 10:19 AM

Someone?

Chienworks wrote on 12/11/2002, 11:28 AM

Two pass encoding tests the project first to find which areas can be compressed more and which need less compression. This allows the compressor to come up with more optimum compression rates for each section of the output and give better quality in fewer bits overall. It's definately a good option especially for lower bitrates and can help streamed files look a lot better. It will take over twice as long to render though.

I don't know if Vegas does multi-rate encoding or not. If it is, then you can encode to several different bitrates in one rendering. If you then host the rendered files on an intelligent streaming server it will ask the media player client which bitrate is best for the viewer's connection and send that version automatically. You would select which bitrates you want to offer.

randyvild wrote on 12/11/2002, 6:33 PM

Chien,
I just did a test. I rendered one file without two pass encoding and got 895kb. Then with the same file enabled two pass encoding and got 1.02 mb. The stream was made larger. Can you explain this?

Chienworks wrote on 12/11/2002, 6:40 PM

Can i explain it? Nope. I have no clue. I seem to get very random sizes when i use two pass encoding. Media Player also displays very funky bitrates when playing the files. I dunno. However, the quality of the playback is usually enough better to make it worth the strangeness.