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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