Why did V5 start giving .MPGs an .M2V extensi

Randy Brown wrote on 5/15/2005, 2:22 PM

May be a dumb one but all of the sudden when I choose the DVDA Main Concept video stream it gives it an .m2v extension instead of the usual .mpg...just curious if anyone knows why.
TIA,
Randy
Oh yeah, also, why would this 1hr 59 min of low action, no effects AVI rendered using the Main Concept video stream be 5 GB?...thanks again!

Comments

Chienworks wrote on 5/15/2005, 5:30 PM

In answer to your second question, because you told it to be 5GB. The amount of action and effects has absolutely nothing to do with it. The file size is entirely dependant on the bitrate and the length. If you want the file smaller, specify a lower bitrate.

Randy Brown wrote on 5/15/2005, 7:53 PM

Thanks Kelly,
I found the only way to get it on a 4.7GB DVD was to use the default render. For some reason though I was under the impression that more movement meant more room on the DVD but I guess it just means the longer the render.
Thanks again Kelly,
Randy

jetdv wrote on 5/15/2005, 8:01 PM

Randy, go to "Custom" and look on the fifth tab. Uncheck the "Elementary Streams" checkbox.

Randy Brown wrote on 5/16/2005, 7:55 AM

Thanks Edward,
I can't imagine how that got checked but....
Thanks again,
Randy

Chienworks wrote on 5/16/2005, 8:32 AM

More movement and action means the encoder may have to compress the information more to keep up with the changes from frame to frame. This can degrade the quality but it will not increase the file size, since you've already specified the target file size that it has to meet.

If you want to maintain the same quality if with a high action video that you would get with a more static video then you have to allow the encoder more bits to work with by specifying a higher bit rate. This is why VBR helps when encoding action at lower bitrates; rather than using a constant number of bits for each frame, the encoder uses less bits for lower action and saves those bits for higher action. However, for the same bit rate settings, even with VBR you'll end up with the same file size regardless of the movement content of the video.

Liam_Vegas wrote on 5/16/2005, 8:32 AM

I found the only way to get it on a 4.7GB DVD was to use the default render
Really hope you didn't mean the "DEFAULT" MPEG2 render template? That one is the absolute worst template you could possibly use as it sets the quality "slider" very low. The result is a video that is very very bad. You should start off with one of the DVDA "default" tempates and modify the bit-rate settings there.

You may need to use a bit-rate calculator to help figure out the settings to use for min/avg/max bit-rate to fit your 2hrs onto the DVD.

Randy Brown wrote on 5/16/2005, 9:08 AM

That one is the absolute worst template you could possibly use as it sets the quality "slider" very low.
Well I used the default with the exception of sliding the quality slider to the far right...it looks okay.
I kept getting errors when trying to use the calculator (and lost my patience jacking with it) so I just tried the default and now I only have 7 copies to go. I never do projects this big but I think I better research this more and take notes for when I do get another one.
Thanks guys,
Randy

John_Cline wrote on 5/16/2005, 9:15 AM

Assuming that you use 192kbps AC3 audio and one non-motion menu, encode your 1:59 video using 2-pass MPEG2 at a maximum of 8,568,000 bps, a mininum of 2,936,000 and an average of 4,896,000 bps. This should just about fill up the disc. (If you want to be a bit conservative, change the maximum to 8,000,000.)

John

Randy Brown wrote on 5/16/2005, 10:02 AM

Hey John, did you use a calculator for those figures? If so where'd you get it?
Thanks,
Randy

John_Cline wrote on 5/16/2005, 10:29 AM

Randy, yes, I used a calculator. You can get it off my web site here:

BitCalc110.zip

John

Randy Brown wrote on 5/16/2005, 12:19 PM

Thank you sir.
Randy