Mencoder: Buffer underflowing
 

1) I have allways several errors "buffer underflowin" in second pass when I encode with MEncoder, but in my player the KSVCD seems good quality.

It is important? How I can correct? with vcr_minrate?
I added noise as Kwag explanation.

2) Yesterday I see one error (only one) "1 duplicated frame". The encode is not stoped and the KSVCD also seems good. What is this?

Thanks for all.

-Maurus

I use generic mencoder CVS build included in MEncocdeMe 0.23

Re: buffer undereflowin
 

vrc_minrate screws up totally the bitrate allocation, so, hands off till mplayer team has fixed that issue.

That seems to be a "smart" behaviour of mencoder BUT if everything plays fine on your Stand Alone Player so, ... well.

The "problem" is: Mencoder does report every little thing when encoding where other encoders doesnt! And Thats why we dont get confused on such details in case of the usage of other encoders.

Thanks.

But "buffer underflowin" is a mencoder warning or it is an error?

Means than the bitrate (when the error occurs) is down a minimal of 300 Kbps (for sample)?

If it play fine my player, can it not work in anothers playes?

-Maurus

If you use a high forced muxrate in mplex and you don't get any bufferunderflow errors there they work on all my dvd players. But since I used Kwag's advice to change the noise to 3th I haven't got a single bufferunderflow anymore :)

What is high forced muxrate in mplex? I use mplex -f 5 -V.

I get "bufferunderflow errors" in second pass with mencoder, not in mplex.

And I use Kwag's advice to change the noise to 3th, but I still see buffer underflowin errors...


Thanks.


-Maurus

Forced mux rate is an option in the mplex gui. If you get buffer underflows during the muxing you set it higher and you won't get any underflows.

But since your not getting them during muxing i guess there's nothing wrong unless your dvd player doesn't play them but my dvd players plays them flawlessly and my friends also :)

set -r 0 that causes an automatic bitrate detection by mplex.

OR do

-r =(video bitrate + audiobitrate)*2.59

.... was it 2.59??? Im not shure right now ... do look into mplex.exe Frontend or BBmpeg

You can choose zero as forced muxrate in mplex gui aswell (it's supposed to detect it automaticly except I sometimes still get buffer under flows so then I use the value kwag suggested somewhere else on kvcd.net and if I still get buffer underflows I just make it a little higher and the buffer underflows are gone and the mpg plays perfect :) On computer and dvd players

What of both aproach is the best?

0 is by default.


Thanks.


-Maurus

I use that everytime and while doing a KVCD (and not a KDVD, zith max = 3000, avg = 1800, aspect = 1.333, res 544*576) I received ;ore message than my dos window could display. And I use a 80*132 window !!!

Well I do SKVCD's its better quality and use

as filter in Mencode-ME but I can't use DVD source like you guys :( I have to use xvid :P