[theora] Are two passes useful in CBR mode ?

thibaut bethune thibaut.bethune at gmail.com
Tue Mar 9 02:45:12 PST 2010

2010/2/26 thibaut bethune <thibaut.bethune at gmail.com>:
> Hi,
> I try to use the video tag to post videos on my blog
> I'm using ffmeg2theora to transcode videos in theora
> Resolution of 320x240 pixels and constant bitrate (CBR) of ~400 kbps
> seems to be ok for publishing on my blog.
> I've read that CBR is a better choice than VBR for web publishing
> regarding the way TCP/IP works.
> ("In TCP it takes a while for a connection to increase its bandwidth.
> (And by “a while” I mean “not that long” but it’s long enough to
> affect the low latency connection that we want for this use case"
> http://hacks.mozilla.org/2009/09/theora-1-1-released/ )
> Am i wrong ?
> I wander if the  --two-pass option in ffmeg2theora is useful or not,
> since the bitrate (and then the file size) is fixed. Can i expect a
> better quality or is it a waste of time in CBR ?
> Thanks in advance

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