I tried setting the bframes to 3 and I got some shakiness back. I can't
explain why, but 2 bframes seems like the magic number. Is it possible that
bframes starts at 0? 0,1,2 then 2 bframes actually means 3?
On 4/23/07, Justin Wetherell <[EMAIL PROTECTED]> wrote:
Maybe it was me but I'll try changing the bframes around again and see
what happens.
On 4/23/07, Duncan Webb < [EMAIL PROTECTED]> wrote:
>
> Justin Wetherell wrote:
> > After further testing, it seems like it's a combo of aspect and
> bframes.
> >
> > Setting aspect to 2 and bframes to 3, REALLY makes the video jumpy
> > Setting aspect to 1 and bframes to 3, KIND of makes the video jumpy
> > Setting aspect to 2 and bframes to 2, Still jumpy but not as bad as
> line
> > above
> > Setting aspect to 1 and bframes to 2, very smooth
> >
> > Lesson learned!
>
> Thanks Justin you have spotted the problem and the fix is now in svn.
>
> The video aspect has changed from 2 to 1 for 4x3 and the b-frames are
> not offset by 1.
>
> Having said this it seems strange as the numbers are quite valid. with
> b-frames at 3 and the gop size at 12 gives:
> IBBBPBBBPBBB|I
> the default is 2 giving:
> IBBPBBPBBPBB|I
>
> The aspect ratio was being set to 16x9 instead of 4x3 I would have
> expected this to add the wide-screen bit to the recording.
>
> v4l2-ctl --list-ctrls is the best tool to spot codec setting errors
>
> Duncan
>
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