MEncoder -ovc lavc question

[sakuya_su]

Hi,

Just wondering, can I use -ovc lavc with CBR encoding? I dont see a CBR option anywhere on the MEncoder manual.

also another thing is if I use -ovc xvidenc -xvidencopts pass=1:bitrate=700, does that encode to CBR 700?

thanks in advanced!

[celtic_druid]

Run -lameopts help and you will get a list of lame options. Basically just -lameopts cbr:128 though. Still I wouldn't recommend CBR in terms of quality.

For that XviD example presumably it will just ignore the bitrate and encode at Q2 since that is what XviD does for the first pass. I wouldn't recommend CBR for video either. Use fixed quant or do 2 passes. So pass=1, pass=2:bitrate=700.

[sakuya_su]

HI,

thank you for the reply, however I have no choice but to use CBR because I watch the file from a Pocket PC using wireless, so bitrate must stay below 900Kpbs.

is there any other way?

also is there a way to encode to CBR using any other codecs? lavc etc?

if I can, do they require 2 pass as well?

Thank you

[celtic_druid]

-lavcopts vcodec=mpeg4:vbitrate=800 should give you CBR. If you do a 2 pass XviD encode though you can use VBV to limit bitrate spikes. With CBR you should get a final product close to 800kbs, however there could still be bitrate spikes over 900.