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<div>Thank you for the quick reply.</div>
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<div>If I understand correctly, the AVCodecContext is instantiated separately from the FormatContext and Streams.</div>
<div>So what I have to do is:</div>
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<div>1- Instanciate the codec context and configure it as you suggested</div>
<div>2- Instanciate an AVFormatContext</div>
<div>3- Add a stream without codec using avformat_new_stream(fmt_ctx, NULL)</div>
<div>4- set stream id and update codecpar using avcodec_parameters_from_context</div>
<div>5- generate the format header with avformat_write_header</div>
<div>6- proceed to the frame encoding loop</div>
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<div>right?</div>
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<div>Le jeudi 13 février 2020 à 11:07 +0100, Strahinja Radman a écrit :</div>
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<div>I need to encode images into an mkv container file using the h264</div>
<div>codec. I would like to set codec-specific options such as '-crf'</div>
<div>but I don't know how to do it. So far I have found/considered several</div>
<div>ways:</div>
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<div>Before you call avcodec_open2 set the property by calling the</div>
<div> </div>
<div> av_opt_set_double(enc_ctx->priv_data, "crf", 23.0, 0);</div>
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<div>Some of the options need to be set on the "priv_data", ones that are </div>
<div>codec related, others can be set directly to the enc_ctx </div>
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<div> av_opt_set_int(enc_ctx, "sc_threshold", 1, 0);</div>
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