[Libav-user] Need help in setting vp9 encoding options from FFmpeg

[rohit khali]

Hi,
I am getting "AVERROR_OPTION_NOT_FOUND" for all below mentioned options.

av_opt_set(c->priv_data, "g", "240", 0) // Maximum keyframe interval
(frames)
av_opt_set(c->priv_data, "vb", "400000", 0) // target bitrate
av_opt_set(c->priv_data, "minrate", "400000", 0)
av_opt_set(c->priv_data, "maxrate", "400000", 0)
av_opt_set(c->priv_data, "bt", "400000", 0)
av_opt_set(c->priv_data, "threads", "4", 0)
av_opt_set(c->priv_data, "slices", "2", 0)

Any idea, how can I set the above mentioned vp9 encoding options in FFmpeg?
https://ffmpeg.org/ffmpeg-codecs.html#Options-29 shows above options as
private data options.

Thanks,
Rohit Khali
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