vaapih264enc and change bitrate

Matteo Valdina matteo.valdina at
Thu Aug 10 13:45:49 UTC 2017

Hi y'all,

I'm trying to use vaapih264enc and change the bitrate during the encoding.

I see from the source code and test that bitrate property is ignored after
the encoding begins.

I would like to know if there is any patch/ongoing work to add this feature
in the vaapi encoder?
Is it feasible as per current source code implementation of vaapih264enc.

The only way to obtain this behavior is to stop and re-start the

Is something that I used on other software and hardware H.264 encoder, so,
I expected that it is achievable.

Matteo Valdina

“There are two ways of constructing a software design: One way is to make
it so simple that there are obviously no deficiencies, and the other way is
to make it so complicated that there are no obvious deficiencies. The first
method is far more difficult.”
- Tony Hoare
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