AVDictionary *video_opts; /* AVOptions for video encoder */
AVDictionary *video_conf; /* Values stored in video AVCodecContext.fields */
AVDictionary *audio_opts; /* AVOptions for audio encoder */
AVDictionary *audio_conf; /* Values stored in audio AVCodecContext.fields */
AVDictionary *video_opts; /* AVOptions for video encoder */
AVDictionary *video_conf; /* Values stored in video AVCodecContext.fields */
AVDictionary *audio_opts; /* AVOptions for audio encoder */
AVDictionary *audio_conf; /* Values stored in audio AVCodecContext.fields */