WMV quality after converting

[rjc7394]

Still haven't found any tools that enable you to calculate the quality of an output file when converting a wmv to mpg. Gordian Knot does a compression test to help you calcuate the frame size and bitrate to help you match the quality of the original file, but Gknot's only accepts VOBs. TMPGEnc doesn't do this, you just set the bitrate and file size to whatever the hell you want and hope for the best. Since wmv's are 512x384 and mpg's are 720x480 it would be futile trying to guess what bitrate you should use. If anyone has any suggestions that would help.
What frame rate do wmv's have?

[celtic_druid]

Not all wmv files have the same framerate.

No reason why you can't do a compressability test with TMPGEnc. You would just have to manually create the script, etc.

[junkmalle]

Why don't you just use Constant Quality in TMPGEnc? If it's the quality you're interested in, who cares what bitrate is used (as long as it's DVD legal).

[rjc7394]

Constant quality means it will try to match the quality of the input file? I don't know anything about programming to work with a script for TMPGEnc: AVISynth has me confused.

[junkmalle]

Constant quality means it will try to match the quality of the input file?

Constant Quality means it will match the quality of the input file as closely as you ask for. That is, 90 percent quality will be very close to the source, 30 percent quality will be much worse.

[bugster]

Since wmv's are 512x384 and mpg's are 720x480

wmv's and mpg's (and any other video codec you care to choose) can have a wide range of resolutions. For standards such as (S)VCD and DVD, the choices are limited, but not by the codecs themselvs.

[rjc7394]

Thanks. That's valuable info.