[FFmpeg-devel] CBR Bitrate control in MPEG-2 video encoder

[Michael Niedermayer]

On Tue, May 25, 2010 at 10:40:29PM +0200, Sven Brandau wrote:
> Hi,
>
> I've tried to encode a very unpredictable and varying video to MPEG-2 video 
> in CBR. It seems that the encoder can't regulate the bitrate so there are 
> spikes where the scenes changes very fast. I would expect that the encoder 
> is able to control all parameters, e.g. quantizer, to fit the bitrate 
> without such spikes but a very low video quality on such scene changes.
>
> I've set these parameters: bitrate, max/min bitrate, vbv buffer
>
> Any suggestions?

cbr (constant bitrate) does not mean constant framesize
the bitrate that enters the vbv should be constant

and only a true mpeg2 stream analyzer can tell you the bitrate prior to
the vbv. Your mail does not sound like you used such a tool

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

When you are offended at any man's fault, turn to yourself and study your
own failings. Then you will forget your anger. -- Epictetus
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