Harald Schlangmann <harry@...> writes:

> Looks I’m doing something fundamentally wrong here.

Did you test with ffmpeg (the application)?
I am not convinced that single pass encoding can 
generally guarantee a target bitrate.

> Any hint on how to influence result file size for mpeg4?

> The only other fields I initialize for AVCodecContext 
> are width, height, time_base, pix_fmt,  

At least constant quantiser vs. bitrate can (and must) 
be set.

Carl Eugen

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