[Libav-user] encoding ProRES - not sure how to configure some settings
martinber764 at yahoo.com
Mon May 13 19:50:34 CEST 2013
I have modified decoding_encoding.c sample code to create a ProRES stream, which I can verify is working properly by decoding the output file with ffmpeg. However encoding is fairly slow and there are some settings that I don't know how to configure.
There are 3 different ProRES encoders and I'm using prores_kostya encoder.
According to this link:
to speed up encoding I should set qscale (recommended value of 4). The other important settings are profile, quant_mat, bits_per_mb, mbs_per_slice and vendor. I don't see where any of those can be configured with the structures I have access to (AVCodecContext, AVCodec). Are these to be set on the 'private data' like in that example for H.264 in encoding_decoding.c:
av_opt_set(c->priv_data, "preset", "slow", 0);
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