CQ vs CQ-VBR

[Happygolucky]

I've searched through the FAQs, at least the ones I can find, and I can't really come up with a definitive answer on the difference, if any, between CQ and CQ-VBR modes for TMPGEnc Plus. Would one produce better quality than the other? Does DVD2SVCD work with both modes equally well?

Thanks in advance for any info.

[Kika]

Turn the Log on while Encoding, you will see the difference...

CQ_VBR prefers the I-Frames over all other Frame-Types. Thats realy good on low motion Videos or clear and sharp source.
CQ tries to give all the Frametypes the "right" bitrate. It's good for captured Videos but not realy good for DVD-Source. But this can be canged. The Standard-Settings of B-Picturte Spoilage are... hum... crazy. Set it to -5 - 5, this results in better Videos.

DVD2SVCD only uses CQ or 2pass.

[Happygolucky]

Originally posted by Kika
Turn the Log on while Encoding, you will see the difference...

CQ_VBR prefers the I-Frames over all other Frame-Types. Thats realy good on low motion Videos or clear and sharp source.
CQ tries to give all the Frametypes the "right" bitrate. It's good for captured Videos but not realy good for DVD-Source. But this can be canged. The Standard-Settings of B-Picturte Spoilage are... hum... crazy. Set it to -5 - 5, this results in better Videos.

DVD2SVCD only uses CQ or 2pass.

The latest DVD2SVCD versions offer the CQ_VBR mode for TMPGEnc, calling it "Automatic Variable Bitrate".

If my source is high-quality AVI files, which would you consider as the best choice?

[Kika]

The latest DVD2SVCD versions offer the CQ_VBR mode for TMPGEnc

Have never realy used DVD2SVCD. The older Versions i tried are using CQ (Constant Quality).

Both modes do have special (dis)advantages. So it's not easy to say, which one is the better one. I normaly do prefer CQ-Mode at medium and high Bitrates (40 - 55 Minutes on 700MB-CD-R), but on low Bitrates, i use CQ_VBR, because CQ eventualy produces too small (and blocky) I-Frames.