minimum DRF and key frames

[kcb]

Is there a setting in the codec to set the key frame to be inserted every 10 secs or is it the encoding applications job? Also how do i set a minimum DRF of 8?

[Teegedeck]

There are no DRFs, they're called 'Quantizers' in XviD, and '8' would be way too high (with the standard matrices) for viewable quality. Please consult the XviD guides (http://www.doom9.org/xvid-guides.htm) and Crusty's FAQ (http://ronald.vslcatena.nl/docs/xvidfaq.html) to learn about the basics of this codec.

[kcb]

I have every set according to the doom9 xvid 1.1 tut. How about the key frames? Is there a specific setting? I can't seem to find anything relevant in the tut and by seraching around

[kcb]

the reason i ask is because sometimes i get:

This video seems to have too FEW Keyframes. May degrade image quality and seeking. (drf analyzer)

in some of the xvid's i encode. Everything is per the tutorial. Is there anyway that i can insert a keyframe every 10 secs?

[communist]

http://forum.doom9.org/showthread.php?t=107789

If I get that "Maximum key frame interval" parameter right XviD will put in a key frame every 300 (def.) frames even if not necessary.

[kcb]

ok thanks that worked.

[Teegedeck]

If I get that "Maximum key frame interval" parameter right XviD will put in a key frame every 300 (def.) frames even if not necessary.XviD is a bit smarter than that. It doesn't put in a keyframe exactly at frame 300 but lowers the keyframe-sensitivity so much that it quickly finds an eligible frame.

[foxyshadis]

Don't listen to DRF's warnings about quality (it was made way back in the 5.0.x era; it will also tell you that n-vops are the devil), but it's true seeking can be impaired. If instant seeking is important and you're going rewind a lot, you might lower it to 60 or so. I do that when I have something I rewind/fastforeward a lot, but then my processor sucks.

[sysKin]

Simply having one b-frame will halve your seeking time. Not to mention two.